TAKUMA, Masanori |
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Faculty, Department/Institute
- Faculty of Engineering Science Department of Mechanical Engineering
Academic status (qualification)
- Professor Apr. 1,2004
Position
- Dean, Faculty of Engineering Science 2020/10/1~2022/9/30
Undergraduate Degrees・University
- Kansai University Faculty of EngineeringDepartment of Mechanical Engineering 1985 Graduated
Graduate Degrees・University
- Kansai University Doctor's Degree Program Mechanical Engineering 1990 Completed
Academic Degrees
- Doctor of Engineering Mar. 1990 Kansai University
Research fields
Research fields | keyword |
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Nondestructive evaluation, Materials systems engineering | Non-destructive inspection;Evaluation;Material;System;Knowledge engineering |
Evaluation system | Evaluation;System;Knowledge engineering |
Research topics
research topic | A Study on Evaluation of Fatigue Damage Using Magnetomechanical Acoustic Emission and Magnetic properties |
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Study theme state | Individual Research |
research duration | |
Research Programs | |
keyword | Magnetomechanical Acoustic Emission,Magnetic properties,Fatigue |
Research field | |
Research Topics Overview |
research topic | A Study on Evaluation for Function of Film with AE |
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Study theme state | Individual Research |
research duration | |
Research Programs | |
keyword | Acoustic Emission,Film,Evaluation |
Research field | |
Research Topics Overview |
research topic | A Study on Evaluation for Function of Joint Using UltrasonicInspection |
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Study theme state | Individual Research |
research duration | |
Research Programs | |
keyword | Ultrasonic Inspection,Evaluation,Joint |
Research field | |
Research Topics Overview |
Research Activities
- It is very important to evaluate the material property of structure member parts with non-destructive method. The aims of my study are the proposal of the evaluation system that added the new information processing technique, and are to solve the mechanism (i.e. fracture and fatigue etc.) with the technique.
Research Career
- Fukui University/assistant 1990/4/1~1994年/3/31
- Kansai University/full-time lecturer 1994/4/1~1997年/3/31
Awards
- The 10th Machine Tool Technology Promotion Prize (Paper Prize) 1989(Machine Tool Technology Promotion Society)
- Processing Technique Workshop, Research Paper Prize (1992) 1992(Tip Processing Institute)
Academic Associations
所属学会・団体名 | 役職名 (役職在任期間) |
---|---|
The Japan Society for Precision Engineering | |
The Japan Society of Mechanical Engineering | |
The Japanese Society for Non-destructive Inspection | |
The Society of Materials Science, JAPAN |
Research Publications
No. | Type of publication | Date of publication (Date of presentation) | Title | Type of research result | Jointly authored or single authored | Publisher and journal name | Volume number |
---|---|---|---|---|---|---|---|
1 | Papers1 | 2017/8~2017,08,00,,, | Fracture mechanics criterion of time-dependent crack initiation from interface free-edge in adhesively bonded butt joints | Co-authored | Engineering Fracture Mechanics | DOI: 10.1016 | |
2 | Papers1 | 2016/6/25~2016,06,25,,, | Study on damage evaluation of magnesium alloy with acoustic emission method (Discrimination of {1012} and {1011} twin) | Academic Journal | Co-author | ||
3 | Papers1 | 2015/5/25~2015,05,25,,, | Evaluation of generation conditions for phase transformations of Ti-Ni alloy with AE method (Comparison with results of structural analysis by MD method) | Academic Journal | Co-author | ||
4 | Papers1 | 2015/1/15~2015,01,15,,, | Evaluation of White Layer on Cast Steel Brake Disc in Bending Fatigue with AE Method | Academic Journal | Co-author | ||
5 | Papers1 | 2014/10/25~2014,10,25,,, | Study on AE properties of A6061-T6 alloy for high-pressure hydrogen gas container during tensile and fatigue testing(Influence of Grain Size) | Academic Journal | Co-author | ||
6 | Papers1 | 2013/1~2013,01,00,,, | White Layer Microstructure Obtained in Reproduction Test of Friction Surface of Cast Steel Brake Disk Material | Academic Journal | Co-author | Journal of Japan Foundry Engineering Society | Vol.85 No.1 pp.21-25 |
7 | Papers1 | 2012/9~2012,09,00,,, | Effect of Hardenability on Heat Shock Resistance of Cast Steel Brake Disk | Academic Journal | Co-author | Journal of Japan Foundry EngineeringSociety | Vol.84-No.9 pp.521-525 |
8 | Conference99 | 2008/12/9~2008/12/122008,12,09,2008,12,12 | Study on Crack Repair of Al2O3 Ceramics by YAG Laser Irradiation -Evaluation for Recovery Condition of Bending Strength Based on Chaos Analysis Results of AE signal- | Other | Co-author | PROGRESS IN ACOUSTIC EMISSION XIV | 95-102 |
9 | Papers1 | 2007~2007,00,00,,, | Study on Evaluation System of Tool Life for Shearing of Piano and Stainless Steel Wire by AE Method -Application of Chaos Time Series Analysis and Wavelet Transform- | Academic Journal | Co-author | Journal of Acoustic Emission | Vol. 24, 52-67 |
10 | Conference99 | 2006~2006,00,00,,, | Study on evaluation system of tool life for shearing -Wavelet transform andchaos time series analysis of AE signals- | Other | Co-author | The 18th International Acoustic Emission Symposium(Progress in Acoustic Emission XIII) | 109-116 |
11 | Conference99 | 2006~2006,00,00,,, | Molecular Dynamics Study on Acoustic Emission in Carbon Nanotube Probe and Metal Surface System | Other | Co-author | The 18th International Acoustic Emission Symposium(Progress in Acoustic Emission XIII) | 75-82 |
12 | Papers1 | 2005~2005,00,00,,, | EVALUATION OF FATIGUE DAMAGE FOR FRM WITH AE METHOD | Academic Journal | Co-author | Journal of Acoustic Emission | Vol.23, 164-172 |
13 | Papers1 | 2005~2005,00,00,,, | THE ORIGIN OF CONTINUOUS EMISSIONS | Academic Journal | Co-author | Journal of Acoustic Emission | Vol.23, 206-214 |
14 | Academic presentation7 | 2004/11/9~2004/11/122004,11,09,2004,11,12 | Evaluation of Fatigue Damage for FRM with AE Method | Co-author | The 17th International Acoustic Emission Symposium | ||
15 | Academic presentation7 | 2004/11/9~2004,11,09,,, | The Origin of Continuous Emissions | Co-author | The 17th International Acoustic Emission Symposium | ||
16 | Academic presentation7 | 2004/11/9~2004/11/122004,11,09,2004,11,12 | The Origin of Continuous Emissions | Other | Co-author | The17th International Acoustic Emission Symposium | 187‐194 |
17 | Research report21 | 2003/3/20~2003,03,20,,, | Basic Study on Prediction of Crack Propagation with Infrared Thermography | In-house publication | Co-author | Technical Report of Life Cycle Engineering() | /,28 |
18 | Academic presentation7 | 2002/11/12~2002,11,12,,, | Evaluation of Bending Fatigue Damage for FRP Laminate with AE -Application of Wavelet Transform- | Academic Journal | Co-author | Progress in Acoustic Emission | /,31 |
19 | Papers1 | 2002/10/5~2002,10,05,,, | Evaluation of Bending Fatigue Damage for FRP Laminate with AE -Application of Fractal Dimension of Wavelet Transform Results and Neural Network- | Academic Journal | Co-author | Journal of the Japan Society for Precision Engineering | 68/10,1309 |
20 | Papers1 | 2002/9/5~2002,09,05,,, | Evaluation of Thermal Shock Damage of TiN Ceramics Film with Acoustic Emission Method | Academic Journal | Co-author | Taransactions of the Japan Society of Mechanical Engineers(Series A) | 68/673,1336 |
21 | Papers1 | 2002/7/5~2002,07,05,,, | Evaluation on Fracture Characteristics of TiN Ceramics Film with Scratch Testing(3rd report,Evaluateion of Scratch Mark Condition by AE Singals) | Academic Journal | Co-author | Transactions of the Japan Society of Mechanical Engineers(Series A) | 68/671,1071 |
22 | Papers1 | 2002/5/5~2002,05,05,,, | Study on Generation Mechanism of Magneto-Mechanical Acoustic Emission(Observation of Generation Behavior with Wavelet Transform) | Academic Journal | Co-author | Transactions of the Japan Society of Mechanical Engineers(Series A) | 68/669,835 |
23 | Lecture19 | 2002/3/23~2002,03,23,,, | Materials Evaluation by Acoustic Emission Method | Other | Single-Author | ||
24 | Research report21 | 2002/3/20~2002,03,20,,, | Evalution on Fracture Characteristics of TiN Ceramics Film with Scrach Testing -Evaluation of Scratch Mark Condition by AE Signals- | In-house publication | Co-author | Technical Report of Ceramics Film() | /,19 |
25 | Research report21 | 2002/3/20~2002,03,20,,, | Evaluation of Bending Fatigue Damage for FRP with AE -Application of Wavelet Transform- | In-house publication | Single-Author | Technical Report of Life Cycle Engineering (I) | /I,28 |
26 | Academic presentation7 | 2001/10/2~2001,10,02,,, | Evaluation of Bending Fatigue Damage for FRP Laminated Plates with AE(Application of Fractal Dimension and Neural Network) | Academic Journal | Co-author | Japanese Society for Non-destructive Inspection | /13,9 |
27 | Papers1 | 2001/8/5~2001,08,05,,, | Basic Study on Damage Restraint of Coating Film(Adoption of Smart Material) | Academic Journal | Co-author | Transactions of the Japan Society of Mechanical Engineers(Series A) | 67/660,1345 |
28 | Papers1 | 2001/5/5~2001,05,05,,, | Study on Cracks Repair with Laser Irradiation in Alumina Ceramics (Evaluation of Repairing Conditions by Acoustic Emission Monitoring) | Academic Journal | Co-author | Transactions of the Japan Society of Mechanical Engineers(SeriesA) | 67/657,906 |
29 | Research report21 | 2001/3/20~2001,03,20,,, | Evaluation on Fracture Characteristics of TiN Ceramics Film with Scratch Testing -Application of AE Method- | In-house publication | Co-author | Technical Report of Ceramics Film() | /,19 |
30 | Research report21 | 2001/3/20~2001,03,20,,, | Basic Study on Damage Restraint of Coating Film-Adoption of Smart Material- | In-house publication | Co-author | Technology Reports of KANSAI UNIVERSITY | /43,11 |
31 | Research report21 | 2001/3/20~2001,03,20,,, | Basic Study on Structual Recognition of Functionally Gradient Material -Adoption of Acoustic Emission in Scratch Testing- | In-house publication | Co-author | Technology Reports of KANSAI UNIVERSITY | /43,21 |
32 | Lecture19 | 2001/3/15~2001,03,15,,, | Evaluation of Bending Fatigue Damage from FRP with AE | Other | Co-author | Acoustic Emission Special Research Committee.published by Japanese Society for Non-destructive Inspection | /114,19 |
33 | Papers1 | 2001/1/4~2001,01,04,,, | Evaluation of Fracture Characteristics of TiN Ceramics Film with Scratch Testing (Application of Fractal Dimension of AE Peak Amplitude Distribution) | Academic Journal | Co-author | JSME International Journal SeriesA | 44/1,123 |
34 | Papers1 | 2000/12/10~2000,12,10,,, | Evaluation of Bending Fatigue Damage for FRP with AE (2nd Report-Application of Neural Network and Fractal Dimension of Wavelet) | Academic Journal | Co-author | Journal of the Japanese Society for Non-destructive Inspection | 49/12,854 |
35 | Academic presentation7 | 2000/11/14~2000,11,14,,, | Wavelet Transform Analysis of Magneto-mechanical Acoustic Emission Signals from Displacement and Shear Sensors | Academic Journal | Co-author | Progress in Acoustic Emission | /,99 |
36 | Papers1 | 2000/11/5~2000,11,05,,, | Evaluation on Fracture Characterristics of TiN ceramics Film with Scratch Testing (2nd Report,Application of Wavelet Transform of AE Signals) | Academic Journal | Co-author | Transactions of the Japan Society of Mechanical Engineers(SeriesA) | 66/651,2074 |
37 | Research report21 | 2000/3/20~2000,03,20,,, | Non-Destructive Evaluation by Ultrasonic Inspection of Tension Shearing Strength of Spot-Welded Joints -Application of Fractal Dimension and Neural Network- | In-house publication | Co-author | Technology Reports of Kansai University | /42,1 |
38 | Research report21 | 2000/3/20~2000,03,20,,, | Estimation of Stress Imposed on a Structure's Member Parts by Magnetomechanical Acoustic Emission -Application of Displacement Sensor and Wavelet Transform- | In-house publication | Co-author | Technology Reports of Kansai University | /42,17 |
39 | Research report21 | 2000/1/31~2000,01,31,,, | Study on Material Evaluation with Acoustic Emission Method | In-house publication | Co-author | Engineering Technology (Technology Reports of Kansai University) | /102,7 |
40 | Papers1 | 1999/12/1~1999,12,01,,, | Evaluation of Bending Fatigue Damage for FRP with AE (1st report -Application of Wavelet Transform) | Academic Journal | Co-author | Journal of the Japanese Society for Non-destructive Inspection | 48/12,862 |
41 | Academic presentation7 | 1999/11/18~1999,11,18,,, | Evaluation of Bending Fatigue Damage for FRP with AE -Application of wavelet transform- | Academic Journal | Co-author | 1999 National Conference on Acoustic Emission | 12/,53 |
42 | Academic presentation7 | 1999/11/18~1999,11,18,,, | Study on Non-destructive Evaluation of Structure's Member Parts Using Magnetomechanical Acoustic Emission -Observation of MAE Signals with Displacement AE Traducer and Wavelet Transform- | Academic Journal | Co-author | 1999 National Conference on Acoustic Emission | 12/,113 |
43 | Papers1 | 1999/8/25~1999,08,25,,, | Evaluation on Fracture Characteristics of TiN Ceramics Film with Scratch Testing (1st Report, Application of Fractal Dimensions of AE amplitude Distribution) | Academic Journal | Co-author | JSME, Series A | 65/636.1696 |
44 | Academic presentation7 | 1999/3/18~1999,03,18,,, | Study on Estimation of Stress Imposed on Member Parts with Magnetomechanical Acoustic Emission | Academic Journal | Co-author | The 74th JSME Kansai Branch Annual Meeting | /994-1,25 |
45 | Academic presentation7 | 1999/3/18~1999,03,18,,, | Evaluation for Bending Fatigue Damage of FRP Laminated Plates with Acoustic Emission Method -Application of Wavelet Transform- | Academic Journal | Co-author | The 74th JSME Kansai Branch Annual Meeting | /994-1,39 |
46 | Academic presentation7 | 1999/3/18~1999,03,18,,, | Study on Magnetomechanical Acoustic Emission | Academic Journal | Co-author | The 74th JSME Kansai Branch Annual Meeting | /994-1,43 |
47 | Academic presentation7 | 1999/3/18~1999,03,18,,, | Evaluation on Fracture Characteristics of TiN Ceramics Film Using Acoustic Emission (Application of Scratch Testing) | Academic Journal | Co-author | The 74th JSME Kansai Branch Annual Meeting | /994-1,47 |
48 | Academic presentation7 | 1999/3/18~1999,03,18,,, | Evaluation on Thermal Shock Damage of TiN Ceramics Film by Repeated Laser Irradiation | Academic Journal | Co-author | The 74th JSME Kansai Branch Annual Meeting | /994-1,49 |
49 | Papers1 | 1998/12/25~1998,12,25,,, | Evaluation on Thermal Shock Damage of TiN Ceramics Film by Repeated Loser Irradiation(1st Repoet, Application of Navelet Transform and AE Features) | Academic Journal | Co-author | TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS(series A) | 64/628,2945 |
50 | Papers1 | 1998/11/25~1998,11,25,,, | Nondestructive Evaluation of Fatigue Damage and Conditions Using Magnetic Properties and Magnetomechanical Acoustic Emission(Application of Neural Network for Low Cycle Fatigue) | Academic Journal | Co-author | TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS(Series A) | 64/627,2862 |
51 | Papers1 | 1998/8/25~1998,08,25,,, | Study on Support System for Design of Composite Laminated Plate(1st Report, Application of Genetic Algorithm and Neural Network) | Academic Journal | Co-author | TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS(series A) | 64/624,2080 |
52 | Papers1 | 1998/8/9~1998,08,09,,, | Wavelet Transform of Magnetomechanical Acoustic Emission under Elastic Tensile Stress with Displacement Sensor | Academic Journal | Co-author | PROGRESS in ACOUSTIC EMISSION | IX/III,20 |
53 | Academic presentation7 | 1998/8/9~1998,08,09,,, | Wavelet Transform of Magnetomechanical Acoustic Emission under Elastic Tensile Stress with Displacement Sensor | Academic Journal | Co-author | 14th International Acoustic Emission Symposiu & th Acoustic Emission World Meeting, | 20. |
54 | Papers1 | 1998/5/25~1998,05,25,,, | Evaluation of Function of Spot-Welded Joint Using Ultrasonic Inspection (2nd Report, Nondestructive Evaluation on Tension Shearing Strength with Fractal dimension and Neural Network) | Academic Journal | Co-author | Transactions of the Japan Society of Mechanical Engineers(Series A) | 64/621,1375 |
55 | Research report21 | 1997/11/20~1997,11,20,,, | Nondestructive Evaluation of Damage and Conditions for Low Cycle Fatigue -Application of Magnetomechanical Acoustic Emission and Magnetic Properties- | In-house publication | Co-author | Engineering & Technology | 11/3,1 |
56 | Academic presentation7 | 1997/11/6~1997,11,06,,, | Evaluation on Fracture Characteristic of TiN Film Using Acoustic Emission | Academic Journal | Co-author | 1997 National Conference on Acoustic Emission | /11,19 |
57 | Papers1 | 1996/10/15~1996,10,15,,, | Evaluation of Function of Spot-Welded Joint Using Ultrasonic Inspection (Nondestructive Evaluation on Tension Shearing Strength with Neural Network) | Academic Journal | Co-author | JSME International Journal(Series A) | 39/4,626 |
58 | Papers1 | 1996/4/1~1996,04,01,,, | Nondestructive Evaluation of Fatigue Damage and Conditions Using Magnetomechanical Acoustic Emission and Magnetic Properties(Report 1)-Application of Neural Network for Low Cycle Fatigue- | Academic Journal | Co-author | Journal of the Japan Society for Non-destructive Inspection | 45/4,276 |
59 | Papers1 | 1996/3/25~1996,03,25,,, | Evaluation of Function of Spot-Welded Joint Using Ultrasonic Inspection(1st Report,Nondestructive Evaluation on Tension Shearing Strength with Neural Network) | Academic Journal | Co-author | JSME,Series A | 62/595,776 |
60 | Academic presentation7 | 1996/3/25~1996,03,25,,, | Evaluation of Spot Welded Joints with Magnetomechanical Acoustic Emission | Academic Journal | Co-author | The Japanese Soc. for Non-Destructive Inspection Spring Convention | /,267 |
61 | Research report21 | 1996/2/25~1996,02,25,,, | Evaluation of Thermal Shock Damage for TIN-Coated Film by Acoustic Emission.-Relation Between Acoustic Emission and Image Data- | In-house publication | Co-author | Engineering Technology of Kansai Univ. | /86,8 |
62 | Papers1 | 1996/1/25~1996,01,25,,, | Study on Support System for Materials Selection in the Design Process(2nd Report,Application of Neural Network and Information Integration Method) | Academic Journal | Co-author | JSME,Series C | 62/593,397 |
63 | Academic presentation7 | 1995/11/9~1995,11,09,,, | Nondestructive Evaluation of Low Cycle Fatigue Damage Using Magneto Mechanical Acoustic Emission | Academic Journal | Co-author | 1995 National Conference on Acoustic Emission | /10,73 |
64 | Academic presentation7 | 1995/11/9~1995,11,09,,, | Evaluation of Thermal Shock Fracture of TiN Film Using Acoustic Emission -Relationship Between AE and Image Data of Film- | Academic Journal | Co-author | 1995 National Conference on Acoustic Emission | /10,115 |
65 | Papers1 | 1995/5/5~1995,05,05,,, | A Study on Tool Management System in Turning (2nd Report) - Tool Selection with Neural Network and Information Integration Method - | Academic Journal | Co-author | Journal of the Japan Society for Procision Engineering | 61/5,772 |
66 | Academic presentation7 | 1995/3/31~1995,03,31,,, | Evaluation on Fracture Strength of TiN Film Using Acoustic Emission | Other | Co-author | The 72th Usual General Meeting Lecture Proceedings() | /,640 |
67 | Academic presentation7 | 1995/3/29~1995,03,29,,, | Study on Support System of Material Selection in Design Process | Other | Co-author | The 72th usual General Meeting Lecture Proceedings() | /,554 |
68 | Academic presentation7 | 1995/3/27~1995,03,27,,, | A Study on Evaluation for Function of Weldment Using Ultrasonic Testing - Nondestructive Evaluation of Spot Welding Zone with Neural Network - | Other | Co-author | The Japan Soc. for Non-Destructive Inspection Spring Convention Lecture Outline Collection in 1995 | /,221 |
69 | Academic presentation7 | 1995/3/27~1995,03,27,,, | Nondestructive Evaluation of Fatigue Damage Using Magnetomechanical Acoustic Emission - Application of Neural Network - | Other | Co-author | The Japanese Soc. for Non-Destructive Inspection Spring Convention Lecture Outline Collection in 1995 | /,227 |
70 | Papers1 | 1995/2/5~1995,02,05,,, | On the System for Setting the Cutting Conditions Based on the Evaluation of Cutting State (2nd Report) - Improvement of Searching Efficiency Using Neural Network - | Academic Journal | Co-author | Journal of the Japan Society for Procision Engineering | 61/2,218 |
71 | Papers1 | 1994/7/5~1994,07,05,,, | A Study on Monitoring of Cutting Process (2nd Report) - Application of Fuzzy Integral Model Using Neural Network - | Academic Journal | Co-author | Journal of the Japan Society for Procision Engineering | 60/7,1014 |
72 | Papers1 | 1994/6/25~1994,06,25,,, | Study on Support System for Materials Selection in the Design Process (1st Report, Application of Neural Network) | Academic Journal | Co-author | Japan Society of Mechanical Engineers | 60/574,2184 |
73 | Papers1 | 1994/5/5~1994,05,05,,, | A Study on Tool Menagement System in Turning (1st Report) - Estimation of Cutting Tool Life by Processing Image Data with Neural Network - | Academic Journal | Co-author | Journal of the Japan Society for Procision Engineering | 60/5,723 |
74 | Papers1 | 1994/2/5~1994,02,05,,, | On the System for Setting the Cutting Conditions Based on the Evaluation of Cutting State (1st Report) - Application of Fuzzy Integral and Hill-Climbing - | Academic Journal | Co-author | Journal of the Japan Society for Procision Engineering. | 60/2,255 |
75 | Papers1 | 1993/8/22~1993,08,22,,, | Estimation of Cutting Tool Life by Processing Tool Image Data with Neural Network | Academic Journal | Co-author | CIRP ANNALS 1993 Manufacturing Technology | 42/1,59 |
76 | Academic presentation7 | 1993/3/26~1993,03,26,,, | On the Study for Setting the Cutting Conditions Based on the Evaluation of Cutting State | Other | Co-author | The Japan Soc. of Precision Engineering Spring Convention Scientific Lecture Association Lecture Proceedings in 1993 | /,189 |
77 | Academic presentation7 | 1993/3/18~1993,03,18,,, | A Study on Tool Management in Turning - Prediction of Tool Information by Neural Network - | Other | Co-author | The Japan Soc. of Mechanical Engineers Hokuriku Branch 30th General Meeting Lecture Proceedings | 937/1, 297 |
78 | Academic presentation7 | 1993/3/18~1993,03,18,,, | A Study on Monitoring of Cutting Process - Recognition of Cutting Process by Processing State of Chip Ejection with Neural Network - | Other | Co-author | The Japan Soc. of Mechanical Engineers Hokuriku Branch 30th General Meeting Lecture Proceedings | 937/1,301 |
79 | Academic presentation7 | 1993/3/18~1993,03,18,,, | A Study on Consulting System for Design - Application of Fuzzy Theory and Neural Network - | Other | Co-author | The Japan Soc. of Mechanical Engineers Hokuriku Branch 30th General Meeting Lecture Proceedings | 937/1,329 |
80 | Academic presentation7 | 1993/3/18~1993,03,18,,, | A Study on Setting of Cutting Conditions - Decision of Cutting Speed by Neural Network - | Other | Co-author | The Japan Soc. of Mechanical Engineers Hokuriku Branch 30th General Meeting Lecture Proceedings | 937/1,305 |
81 | Papers1 | 1992/12/31~1992,12,31,,, | On the System for Setting of the Cutting Conditions Based on the Evaluation of Cutting State - Case of the Situations Tending Chatter - | Academic Journal | Co-author | International Journal of the Japan Society for Precision Engineering | 26/4,354 |
82 | Academic presentation7 | 1992/6/27~1992,06,27,,, | A Study on a Support System for Materials Selection in the Design Process | Other | Co-author | The Japan Design Engineering Association Hokuriku Branch 1992 Research Presentation Proceeding | /,29 |
83 | Papers1 | 1992/6/5~1992,06,05,,, | A Study on Monitoring of Cutting Process (1st Report) - Evaluation of Tool changing Time Using Fuzzy Model - | Academic Journal | Co-author | Journal of the Japan Society for Precision Engineering | 58/6,993 |
84 | Papers1 | 1992/4~1992,04,00,,, | A Study on the System for Setting the Cutting Conditions with the Model of Machinist's Thinking Way | Academic Journal | Co-author | Advanced Production Technology | /11,45 |
85 | Papers1 | 1991/7/5~1991,07,05,,, | On the Improvement of Working Accuracy by Fuzzy Control | Academic Journal | Co-author | Journal of the Japan Society for Procision Engineering | 57/7,1281 |
86 | Papers1 | 1989/7/5~1989,07,05,,, | Acquisition and Model Representation of Machining Know-how Using Fuzzy Algorithms | Academic Journal | Co-author | Journal of the Japan Society for Precision Engineering | 55/7,1211 |
87 | Papers1 | 1988/4/5~1988,04,05,,, | Grading Sharpness of Grinding Wheel Using Fuzzy Integral - Study on the Grinding Sound (4th Report) - | Academic Journal | Co-author | Journal of the Japan Society for Precision Engineering | 54/4,761 |
88 | Papers1 | 1987/6/25~1987,06,25,,, | Decision Support System for Turning Conditions based on Threshold Logic and Fuzzy Inference | Academic Journal | Co-author | Japan Society of Mechanical Engineers | 53/490,1269 |
89 | One's own expense publishing book99 | 1986/10/1~19901986,10,01,1990,00,00 | A Study on the Manufacturing Software with Fuzzy Theory | Monograph | Single-Author |
PapersIn refereedIn-house publicationCo-authored;;;2023/3~
International academic conferenceUnrefereedAcademic JournalCo-authored;;;;2022/5/16~2022/5/18
PapersIn refereedAcademic JournalCo-authoredTAKUMA,Masanori;;;;2022/4/25~10.1299/transjsme.22-00019
Academic presentationUnrefereedAcademic JournalCo-authored;;;;;2022/3/16~2022/3/17
Academic presentationUnrefereedAcademic JournalCo-authored;;;;;;2022/3/16~2022/3/17
Academic presentationUnrefereedAcademic JournalCo-authored;;;;;;2022/3/16~2022/3/17
Academic presentationUnrefereedAcademic JournalCo-authoredTAKUMA,Masanori;;;;;2021/11/4~2021/11/5
PapersIn refereedAcademic JournalCo-authored;;;;;2019/12/25~DOI: 10.1299/transjsme.19-00206
Academic presentationUnrefereedAcademic JournalCo-authoredTAKUMA,Masanori;;;2019/11/12~2019/11/13
LectureUnrefereedIn-house publicationCo-authoredTAKUMA,Masanori;;;2019/9/11~
LectureUnrefereedOtherSingle-AuthorTAKUMA,Masanori2019/7/5~
Academic presentationUnrefereedAcademic JournalCo-authored;;;;;;;2019/3/11~2019/3/12
Academic presentationUnrefereedAcademic JournalCo-authoredTAKUMA,Masanori;;;;;;2018/11/15~2018/11/16
Academic presentationUnrefereedAcademic JournalCo-authoredTAKUMA,Masanori;;;;;2018/11/15~2018/11/16
Academic presentationUnrefereedAcademic JournalCo-authoredTAKUMA,Masanori;;;;2018/11/15~2018/11/16
Academic presentationUnrefereedAcademic JournalCo-authoredTAKUMA,Masanori;;;;;;2018/9/9~2018/9/12
Academic presentationUnrefereedAcademic JournalCo-authored;TAKUMA,Masanori;;;;;2018/3/12~2018/3/13
Academic presentationUnrefereedAcademic JournalCo-authored;TAKUMA,Masanori;;;;2018/3/12~2018/3/13
Academic presentationUnrefereedAcademic JournalCo-authored;;;;;2018/3/12~2018/3/13
Academic presentationUnrefereedAcademic JournalCo-authoredTAKUMA,Masanori;;;;;;2018/3/12~2018/3/13
Academic presentationUnrefereedAcademic JournalCo-authored;;;;;;2018/3/10~
Academic presentationUnrefereedAcademic JournalCo-authored;;;;2018/3/10~
Academic presentationUnrefereedAcademic JournalCo-authoredTAKUMA,Masanori;;;;2017/11/9~2017/11/10
Academic presentationUnrefereedAcademic JournalCo-authoredTAKUMA,Masanori;;;;;2017/11/9~2017/11/10
PapersFracture mechanics criterion of time-dependent crack initiation from interface free-edge in adhesively bonded butt jointsIn refereedCo-authoredY. Takahashi;K. Inoue;M. Takuma;K. Saitoh;T. SatoEngineering Fracture MechanicsDOI: 10.10162017/8~
Academic presentationUnrefereedOtherCo-authorTAKUMA,Masanori;;;;;2017/3/13~2017/3/14
Academic presentationUnrefereedOtherCo-authorTAKUMA,Masanori;;;;;;2017/3/13~2017/3/14
Academic presentationUnrefereedOtherTAKUMA,Masanori;;;;;;2017/3/13~2017/3/14
Academic presentationUnrefereedOtherCo-authorTAKUMA,Masanori;;;;2017/3/13~2017/3/14
Academic presentationUnrefereedOtherCo-authorTAKUMA,Masanori;;;;;;2017/3/11~2017/3/11
International academic conferenceIn refereedOtherCo-editorTAKUMA,Masanori;Shigeru Matsuda;Yoshinori Asagoe;Kenichi Saitoh;Yoshimasa Takahashi;Tomohiro Sato2016/12/5~2016/12/8
Academic presentationUnrefereedOtherCo-authorTAKUMA,Masanori;;;;;;;2016/10/8~2016/10/10
Academic presentationUnrefereedOtherCo-authorTAKUMA,Masanori;;;;;2016/10/8~2016/10/10
Academic presentationUnrefereedOtherCo-authorTAKUMA,Masanori;;;2016/9/11~2016/9/14
PapersStudy on damage evaluation of magnesium alloy with acoustic emission method
(Discrimination of {1012} and {1011} twin)In refereedAcademic JournalCo-authorTAKUMA,Masanori;Naoto YAMASHITA;Shigeru MATSUDA;Yoshinori ASAGOE;Yuu HINOHARA;Keisuke OOSUMI;Kenichi SAITOH;Yoshimasa TAKAHASHI;Tomohiro SATO2016/6/25~Recently, the fuel consumption improvement by weight saving is required in transportation machine. Therefore, Mg alloy is expected as the alternative material of Al alloy and resin material, because it is the lightest in the practical metals and its specific intensity is high. However, twin crystal deformation occurs easily, and there are the two kinds types (i.e. {1012} and {1011} twin crystal) in that deformation. It has been reported that the {1012} twin crystal has work to relax the stress concentration and the {1011} twin crystal has close relation to fracture. Our aim is to evaluate the kinds and the conditions of those types with AE method. In this study, Mg alloy AZ31 was used, and the AE signals of the alloy were detected in compression, tensile and CT test. After that, the analysis of those signals were done. From the results obtained under this experimental conditions, the following things became clear. (1) The frequency components near 250, 550 and 850 kHz are caused by slip, twin crystal deformation and crack growth respectively. (2) It is possible that the two kinds crystal deformation types are discriminated by the identification standards decided by the AE count and fractal dimension Fd of the detected signals.
Academic presentationUnrefereedOtherCo-authorTAKUMA,Masanori;;;;2015/11/19~2015/11/20
Academic presentationUnrefereedOtherCo-authorTAKUMA,Masanori;;;;;2015/11/19~2015/11/20
Academic presentationUnrefereedOtherCo-authorTAKUMA,Masanori;;;;;2015/11/19~2015/11/20
Academic presentationUnrefereedOtherTAKUMA,Masanori;;;2015/10/8~2016/10/10
Academic presentationUnrefereedOtherCo-authorTAKUMA,Masanori;;2015/9/13~2015/9/16
PapersEvaluation of generation conditions for phase transformations of Ti-Ni alloy with AE method (Comparison with results of structural analysis by MD method)In refereedAcademic JournalCo-authorTAKUMA,Masanori;SATO, Tomohiro;SAITOH, Ken-ichi;NAKANO, Yusuke;MORIKAMI, Atsushi2015/5/25~SMA (Shape Memory Alloy) is utilized in various fields. Especially, Ti-Ni alloy has excellent features than other SMA. And, the alloy has two kinds of the phase transformations of rhombohedral (R) and martensitic (M) phase. Though R-phase transformation is not suitable for large deformation, it has been reported that its function for the cyclic deformation is steady. However, the detailed regulation for evaluating the function deterioration and life of the transformations has not been determined, because each factor affects the complexity to each other. Therefore, the establishment of the technique which evaluates the deterioration by the cyclic deformation is desired. In this study, the features of the AE (Acoustic Emission) signals detected in tensile and cyclic deformation test and the structure analysis results of the simulation with MD (Molecular Dynamics) method were compared. As the results, the following things became clear. The frequency components of the signals detected by R- and M-phase were about 750 and 350 kHz respectively. The properties of the signals in each phase showed the chaoticity, and they changed with the increase in the stress. The occurrence behaviors and features of the signals changed with the transitions of the hysteresis loop of σ-ε diagram by cyclic deformation. The generation condition of the R-phase seldom changed in the deformation until rearrangement of R-phase. On the other hand, the conditions on R- and M-phase decreased in the cyclic deformation until M transformation, because the residual phases disturbed the occurrence of M-phase. By observing the simulation results, it was possible to show the existence of the phase transformations of "Austenite (A) phase→R-phase→M-phase" and "A-phase→M-phase". And the correlations between those generation behaviors and the characteristics changes of the signals were recognized.
PapersIn refereedAcademic JournalCo-authorTAKUMA,Masanori;OOSUMI, Keisuke;MATSUDA, Shigeru;SAITOH, Kenichi;TAKAHASHI, Yoshimasa;ASAGOE, Yoshinori;NAKANISHI, Naoto2015/3/25~Magnesium alloy is the lightest material in all practical metals, and has the excellent mechanical properties. From such reasons, the alloy is noticed as the attractive material in various fields. However, the alloy has the weak points that are inferior for heat and corrosion resistance. Therefore, it will be possible to guarantee the safety security of structure parts, if the information on the fracture strain and life, etc. are evaluated by the signals detected from the alloy under those use environment. The three type specimens of the virgin, the heat history (i.e. repeatedly gave the heating to the virgin specimen) and the corrosion specimen (i.e. immersed the virgin specimen into solution) are prepared in this study. Then, the tensile test was carried out for each specimen, and the AE signals emitted in the testing were detected. Frequency and fractal dimension analysis were carried out in order to extract the features of those signals. From such analysis results, the feature extraction of the signal by the elasticity twin deformation was done, because that deformation participates in the degradation of mechanical properties. As the result, the following things became clear under the experimental condition in this study: The frequency component of the signals caused by that deformation is near 550 kHz. The fractal dimensions Fd of those signal show the value over 1.85. Then, it was examined whether the fracture strain is evaluated by the Ib value (Improved b-value) led from the frequency distribution of the Fd. As the result, the effectiveness of this method proposed under the experimental conditions in this study was confirmed. Therefore, the possibility for the prediction of that strain by the AE signal detected in elastic region was shown.
PapersEvaluation of White Layer on Cast Steel Brake Disc in Bending Fatigue with AE MethodIn refereedAcademic JournalCo-authorTAKUMA,Masanori;HARADA, Naoki;SAITO, Kenichi;WAKITA, Masashi;TSUJIKAWA, Masato;HIGASHI, Kenji2015/1/15~
International academic conferenceIn refereedOtherCo-authorTAKUMA,Masanori;Hideaki Obayashi;Kenichi Saitoh;Yoshimasa Takahashi;Yoshinori Asagoe2014/11/11~2014/11/14
PapersStudy on AE properties of A6061-T6 alloy for high-pressure hydrogen gas container during tensile and fatigue testing(Influence of Grain Size)In refereedAcademic JournalCo-authorTAKUMA,Masanori;IWATA, Satoshi;SAITOU, Kenichi;MATSUI, Junki;TAKAHASHI, Yoshimasa;TSUZUKI, Yuto2014/10/25~A6061-T6 alloy has been used in the liner material of high-pressure hydrogen gas storage container that is mounted on a fuel cell vehicle. The degradation of the properties such as strength, toughness and hydrogen embrittlement resistance, etc., has been pointed out, because the grain structure of the mouthpiece part of the liner becomes coarse in the manufacturing process. The tensile and fatigue test for the specimens with different grain size were done, and the detected AE signals during the testing were analyzed. In the tensile test, the characteristics of the signals on dislocation motion, transgranular and intergranular fracture were extracted. In the fatigue test, it was shown that the possibility of which the damage is evaluated by the spectral analysis that utilizes the slope of an approximation straight line in the both logarithmic scale display of FFT analysis result. Then we proposed the amplitude ratio Rv that is the parameter which divided the maximum amplitude of signal for intergranular fracture by that of detected signal, and the correlation between the grain size and the Rv was recognized. These proposed information are able to be utilized in order to evaluate the damage of the container.
Academic presentationUnrefereedOtherCo-authorTAKUMA,Masanori;;;;;2014/6/3~2014/6/4
PapersIn refereedAcademic JournalCo-authorTAKUMA,Masanori;;Kenichi SAITOH;Tomohiro SATO;HIRAI, Yoshimasa;SAYAMA, Shinichi;TAKAHASHI, Yoshimasa2014/5/25~The bimetal materials that sintered the powder of lead bronze on the base material (i.e. carbon steel) have the excellent performance as the bearing material. However, the nation or the society is moving on with the planning on the use restriction of lead and lead compound. Therefore, lead-free copper alloy is developed, and the practical applications of the alloy are advanced. However, the mechanical properties of the bimetal material that sintered the alloy powder have not sufficiently been grasped. In this study, the evaluation of the fracture mechanism and that types which arose in the materials was examined. As the results, it was possible to grasp or evaluate each fracture type by the frequency component of Acoustic Emission (AE) signal with Fast Fourier Transform (FFT) method, and the m value which is led from the amplitude distribution of the signal. By using the criterion for recognizing each type, it was proven that the proposed technique in this study can evaluate the fracture mechanism of each bimetal material which changed the type of the lining material.
Academic presentation2014/3/17~2014/3/17
PapersIn refereedAcademic JournalCo-authorM. Takuma;S. HISADA;K. SAITOH;Y. TAKAHASHI;Y. KOBAYASHI;A. KADONO;A. MURATA;S. IWATA;T. SASAKIAdvances in Materials Science and Engineering20142014/2/10
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Academic presentationCo-authorJ. Horiyama;M. Takuma;K. Saitoh;Y. Takahashi2013/3/16~2013/3/17
Academic presentationCo-authorN. Yamashita;M. Takuma;K. Saitoh;Y. Takahashi2013/3/16~2013/3/17
Academic presentationCo-authorY. Takekita;M. Takuma;N. Harada;K. Saitoh;Y. Takahashi2013/3/16~2013/3/17
PapersIn refereedAcademic JournalCo-authorN.Harada;M. Takuma;M. Tujikawa;K. HigashiWaer3022013/1/29~
PapersWhite Layer Microstructure Obtained in Reproduction Test of Friction Surface of Cast Steel Brake Disk MaterialIn refereedAcademic JournalCo-authorN. Harada;M. Takuma;M. Tsujikawa;K. HigashiJournal of Japan Foundry Engineering SocietyVol.85 No.1 pp.21-252013/1~
International academic conferenceIn refereedCo-author2012/11/27~2012/11/30
Academic presentationCo-authorM. Takuma;K. Saitoh;Y. Takahashi2012/11/23~2012/11/24
Academic presentationCo-authorS. Iwata;M. Takuma;K. Saitoh;Y. Takahashi2012/10/22~2012/10/24
Academic presentationCo-authorT. Sasaki;M. Takuma;K. Saitoh;T. Satoh;Y. Hirai;T. Takahashi2012/10/22~2012/10/24
Academic presentationCo-authorS. Matuda;M. Takuma;K. Saitoh;Y. Takahashi;Y. Maniwa2012/10/22~2012/10/24
PapersEffect of Hardenability on Heat Shock Resistance of Cast Steel Brake DiskIn refereedAcademic JournalCo-authorN. Harada;Y. Tanida;T. Fukuda;M. Takuma;M. Tsujikawa;K. HigashiJournal of Japan Foundry EngineeringSociety Vol.84-No.9 pp.521-5252012/9~
LectureSingle-AuthorM. Takuma2012/5/25~
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Academic presentationUnrefereedOtherCo-authorMazanori TAKUMA;Noboru SHINKE;Yoshimasa TAKAHASHI;Naoto YAMASHITA2011/9/26~
Academic presentationUnrefereedOtherCo-authorMasanori TAKUMA;Noboru SHINKE;Tomohiro SATOH;Yoshimasa HIRAI;Yoshimasa TAKUAHASHI;Shinich SAYAMA2011/9/26~
PapersIn refereedAcademic JournalCo-authorMasanori TAKUMA;Noboru SHINKE;Yoshimasa TAKAHASHI;Keiji FUJII(B);Naoto YAMASHITA(B)Product Evaluation;Diagnostic Technique;Nondestructive Inspection;Acoustic Emission;ChaosTRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERSVol.77, No.7812011/9~The Janan Society of Mechanical EngineersThe laser welding methods are widely used for manufacturing the products that the high quality welding conditions are required. Therefore, the establishment of the evaluation method for the melting conditions is desired. In the previous paper, the method by using the features of detected AE signals, when the irradiation energy was changed at the pulse width, was proposed. The results showed the following: (1) The frequency range of the signal of melting is near 300 kHz. (2) The correlation coefficients of the regression equations that evaluate the melting conditions from the AE energy of transversal wave components showed the high value. (3) The high correlations were recognized with the equations that evaluate the conditions by the led largest Lyapnov exponents from the wavelet transform results of the longitudinal wave component. However, it was proven that the frequency range of the thermal shock wave overlaps to the range of the melting, when the temperature rise rate lowers with the decrease of the lamp input voltage. Therefore, the evaluation method in the previous paper is not able to use in case of the evaluation of the melting conditions under the condition for changing the irradiation energy at the voltage. The method for evaluating the melting conditions, when the irradiation energy is changed by the voltage and the pulse width, is proposed in this paper. Concretely, the detected signals in the range (i.e. after 2 ms from the irradiation completion) that the influence of the thermal shock wave fades out, and the temperature of the irradiation part keeps the over melting point are analyzed with chaos and wavelet transform analysis method. The summaries of the result in this study are like the following. The correlation coefficients of the regression equations that evaluate the melting conditions from AE parameters showed the high value. One of the parameters is the correlation dimension Cd of transversal wave component, and the rest are the largest Lyapnov exponent LLy and the correlation dimension Cd of the time fluctuation waveform on the energy rate of the wavelet coefficient of longitudinal wave component. From the above results, it was shown to be possible that the melting conditions can be evaluated with the proposed method in this study, when the irradiation energy is changed by the lamp input voltage and the pulse width.
Academic presentationUnrefereedOtherCo-authorTAKUMA,Masanori2011/3/19~2011/3/20
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International academic conferenceIn refereedOtherCo-authorMasanori TAKUMA, Noboru SHINKE and Kenji KAMIMURA(D);Noboru SHINKE;Kenji KAMIMURAPROGRESS IN ACOUSTIC EMISSIONXV,67-722010/11/16~2010/11/19
PapersIn refereedAcademic JournalCo-authorTAKUMA,Masanori2010/10/25~
LectureIn refereedIn-house publicationCo-authorTAKUMA,Masanori2010/9/27~
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ConferenceStudy on Crack Repair of Al2O3 Ceramics by YAG Laser Irradiation -Evaluation for Recovery Condition of Bending Strength Based on Chaos Analysis Results of AE signal-OtherCo-authorM.Takuma;N.Shinke;Y.Matsui;Y.TomatsuPROGRESS IN ACOUSTIC EMISSION XIV95-1022008/12/9~2008/12/12PROGRESS IN ACOUSTIC EMISSION XIV
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LectureTAKUMA,Masanori2008/1/21~
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PapersStudy on Evaluation System of Tool Life for Shearing of Piano and Stainless Steel Wire by AE Method -Application of Chaos Time Series Analysis and Wavelet Transform-Academic JournalCo-authorM. Takuma;N. Shinke;T. Nishura;K. AkamatuJournal of Acoustic EmissionVol. 24, 52-672007~
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ConferenceStudy on evaluation system of tool life for shearing -Wavelet transform andchaos time series analysis of AE signals-OtherCo-authorM. Takuma;N. Shinke;T. Nishiura;K. AkamatuThe 18th International Acoustic Emission Symposium(Progress in Acoustic Emission XIII)109-1162006~The 18th International Acoustic Emission Symposium(Progress in Acoustic Emission XIII)Kanagawa
ConferenceMolecular Dynamics Study on Acoustic Emission in Carbon Nanotube Probe and Metal Surface SystemOtherCo-authorH. Takeshita;K. Saitoh;N. Shinke;M. TakumaThe 18th International Acoustic Emission Symposium(Progress in Acoustic Emission XIII)75-822006~The 18th International Acoustic Emission Symposium(Progress in Acoustic Emission XIII)Kanagawa
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PapersEVALUATION OF FATIGUE DAMAGE FOR FRM WITH AE METHODAcademic JournalCo-authorM.Takuma;N.ShinkeJournal of Acoustic EmissionVol.23, 164-1722005~
PapersTHE ORIGIN OF CONTINUOUS EMISSIONSAcademic JournalCo-authorK.Ono;H.Cho;M.TakumaJournal of Acoustic EmissionVol.23, 206-2142005~
CommentaryCo-author2004/12~
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Academic presentationEvaluation of Fatigue Damage for FRM with AE MethodCo-authorTAKUMA Masanori;Noboru SHINKEThe 17th International Acoustic Emission Symposium2004/11/9~2004/11/12The 17th International Acoustic Emission SymposiumTokyo
Academic presentationThe Origin of Continuous EmissionsCo-authorTAKUMA Masanori;Kenji ONO;Hideo CHOThe 17th International Acoustic Emission Symposium2004/11/9~
Academic presentationThe Origin of Continuous EmissionsOtherCo-authorKanji ONO;Hideo CHO;Masanori TAKUMAThe17th International Acoustic Emission
Symposium187‐1942004/11/9~2004/11/12The17th International Acoustic Emission
SymposiumTokyo
LectureSingle-AuthorTAKUMA,Masanori2004/7/15~
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Research reportBasic Study on Prediction of Crack Propagation with Infrared ThermographyUnrefereedIn-house publicationCo-authorTAKUMA Masanori;Noboru SHINKE;Junta SATOHGraph Information;Graph Theory;Thermography;Damage Evaluation;Monitoring;Image Processing;Crack Propagation;Nondestructive InspectionTechnical Report of Life Cycle Engineering()/,282003/3/20~ORDIST. of KANSAI UNIVERSITYIn the previous report, the AE method was applied to the evaluation of bending fatigue damage of the FRP laminates, and the effectiveness was reported. By the way, it becomes important to detect the crack and predict its propagation behavior for securing the reliability and the safety of the structures. Therefore, the studies on the detection of the crack with infrared thermography are carried out. However, in order to predict the behavior of the crack propagation in which the complicated factors are included, it is required that the establishment of the methodology which is able to make good use of the obtained rules from the observational results. In this study, the graph information as the features of the detected crack from the thermal image is collected, and the system which predicts the behavior of the crack propagation on the basis of the found rules from the information is proposed. In short, the graph information in three dimensional space is obtained by processing the thermal images with the order of "subtraction processing extraction of maximum temperature by line measurement application of graph theory". And, the behavior of the crack propagation is predicted on the basis of the degree which is similar to which propagation types in the database. As the results of examining the validity of this system, the following things became clear. (1) It was possible to clarify the thermal distribution and the shape of the crack part by subtraction processing and line measurement, (2) The rules on the graphing of the crack shape were founf from the experimental results and it was possible to quantitatively extract the graph information on the types of the crack propagation, (3) By comparing the experimental results with the predicted results, it was proven that the predictions of this system were appropriate.
Academic presentationEvaluation of Bending Fatigue Damage for FRP Laminate with AE -Application of Wavelet Transform-UnrefereedAcademic JournalCo-authorTAKUMA Masanori;Noboru SHINKEEvaluation;Wavelet Transform;Acoustic Emission;FRP Laminated Plates;Bending Fatigue DamageProgress in Acoustic Emission /,312002/11/12~The 16th International Acoustic Emission SymposiumIt is difficult to evaluate the damage of CFRP during the fatigue testing.Wavelet transform(WT) is the useful method at the analysis of the signals.The resultant mapping of wavelet coefficients in the time-frequency coordinate plane provides the informative characterization of the signals.In this report,the AE signals of CFRP laminates subjecting to cyclic bending loads were recorded at each cycle during the testing,and were analyzed with WT for evaluating its damage and fracture modes.By observing the resultant mapping of the coefficients at each cycle,the following things became clear;(1)We could discriminate the different signals by the fatigue damage and the fracture modes at a glance because the mapping illustrated the characteristic features of the singals.(2)It was proved with WT that the several fracture modes and the time difference of which the each fracture mode occurs exist in a signal.(3)By using the presented method,it was proved to be able to recognize the fatigue damage and the fracture modes of CFRP laminates with nondestructive inspection.
PapersEvaluation of Bending Fatigue Damage for FRP Laminate with AE -Application of Fractal Dimension of Wavelet Transform Results and Neural Network-In refereedAcademic JournalCo-authorTAKUMA Masanori;Noboru SHINKE;Ken SUZUKI;Toshiyuki FUJIIBending Fatigue Damage;Neural Network;Fractal Dimension;Wavelet Transform;Acoustic Emission;FRPJournal of the Japan Society for Precision Engineering68/10,13092002/10/5~Japan Society for Precision EngineeringFiber reinforced plastics(FRP) has become one of the important structural materials in the various fields.Therefore,it is important to evaluate the fracture modes and the fatigue damage of FRP laminates.Acoustic emission(AE) monitoring is useful to study its damage and the modes.However,it is difficult to evaluate the damage and the modes during the fatigue testing.Recently,Wavelet Transform(WT) are the center of attention at the analysis of the signals.The resultant mapping of wavelet coefficients in the time-frepuency coordinate plane provides more informative characterization of the signals than the power-density spectra from Fourier Transform(FT).In this report,the AE signals of CFRP and GFRP laminates(i.e.[0°],[0°/90°] and [±45°])subjecting to cyclic bending loads were recorded at each cycle during the fatigue testing,and were analyzed with WT for evaluating its damage and the modes.By observing the resultant mapping at each cycle,it is possible to develop a methodology for evaluating the damage and the modes by using the characteristic features of the mapping.This system consistes of an AE measuring device and a neural network.The network has learned the pattern sets dealing with the interaction between the features of the mapping and the fatigue damage.The character of the mapping wes expressed by fractal dimensions that were led by the box-counting method.The effectiveness of this system is demonstrated by comparing results of the neural network with experimental data obtained from the fatigue tests.
PapersEvaluation of Thermal Shock Damage of TiN Ceramics Film with Acoustic Emission MethodIn refereedAcademic JournalCo-authorTAKUMA Masanori;Noboru SHINKE;Takuji FUKUROTANIEvaluation;Image Processing;Fractal;Neural Network;Thermal Shock;Ceramics;Acoustic EmissionTaransactions of the Japan Society of Mechanical Engineers(Series A)68/673,13362002/9/5~Japan Society of Mechanical EngineersIt is widely used in the industry field,because the ceramics coating materials have many excellent features.However,that clear criterions for evaluation on the character of films have not been determined is made to lower the reliability of the materials.It is necessary to quantitatively grasp the damage conditons and growth in order to determine the criterions.In this study,the technique that quantitatively evaluates the damage conditions of the films with AE method and image processing technique,when the thermal shock was repeatedly given to the film by YAG laser,is proposed.Concretely,the detected AE signals by a laser irradiation are devided into heating and cooling process,and the features of AE signals in the individual process are extracted.And,the fetures of damage conditions in the irradiation area are quantitatively extracted by image processing.The detected AE signals in heating process correspond with the image data on the damage before a laser irradiation.Therefore,the neural network for estimating the damage before an irradiation learned the relationship between the signals and the image data.On the other side,the detected AE signals in cooling process correspond with the image data on the damage growth after an irradiation.Therefore,the network for estimating the damage growth after an irradiation learned the relationship between the signal and the image data.From the output of the two networks,it was possible to evaluate the conditions and the growth of the thermal shock damage.The effectiveness of the constructed network became clear by the comparison with the experimental results.
PapersEvaluation on Fracture Characteristics of TiN Ceramics Film with Scratch Testing(3rd report,Evaluateion of Scratch Mark Condition by AE Singals)In refereedAcademic JournalCo-authorTAKUMA Masanori;Noboru SHINKE;Kazunari FUJII;Takahiro KUBO;Akira YONEKURA;Seiki KAWAIEvaluation;Multiple Regression Analysis;Fuzzy Set Theory;Fracture Characteristics;Wavelet Transform;Scratch Testing;TiN Film;Acoustic EmissionTransactions of the Japan Society of Mechanical Engineers(Series A)68/671,10712002/7/5~Japan Society of Mechanical EngineersMany of the ceramic coating materials can be exposed to harsh working conditions.Therefore,for producing superior coating materials,it is necessary to establish a methodology for evaluatig the mechanical properties of these materials.Until the former report,nine kinds of TiN film 5m thick,which were deposited on the differrent parent materials under different N2 partial pressure,were scratched and the relationship between the characteristics of the detected acoustic emission(AE) signals and the fracture modes of the film(i.e. cracking,chipping and flaking)was investigated.As the results,the following things became clear:(1)the fracture modes were classified by fractal deminsion m determined AE peak amplitude distributions.(2)the changes of the fracture mode were evaluated by observing the analysis with wavelet transform(WT).In this report,time fluctuation signals of wevelet coefficient,multiple analysis and fuzzy reasoning were used to evaluate the scratch mark conditions.From the experimental results,it was found that the conditions were evaluated by this method.
PapersStudy on Generation Mechanism of Magneto-Mechanical Acoustic Emission(Observation of Generation Behavior with Wavelet Transform)In refereedAcademic JournalCo-authorTAKUMA Masanori;Noboru SHINKE;Kanji ONO;Ryuuichi INOUE;Nozomu MATSUIWavelet Transform;FFT;Shear Sensor;Displacement Sensor;Magneto-mechanical Acoustic Emission;Feromagnetic Material;Iron and Steel;Non-destructive InspectionTransactions of the Japan Society of Mechanical Engineers(Series A)68/669,8352002/5/5~Japan Society of Mechanical EngineersIn assuring the safety of a structure,it is important to evaluate the state of structural members non-destructively by magneto-mechanical acoustic emission(MAE).MAE is useful in NDT,because it reflects minute changes of stress and microstructure of ferrous materials.We studied MAE signals of a pure iron using displacement and shear sensors,for the detection of the longitudinal and shear components of the signals,which were analyzed by wavelet transform.The mapping of wavelet coefficients in the time-frequency coordinate plane provides informative characterization of the signals.From the analysis,we found that the low(150 to 300kHz)and high frequency (400 to 800 kHz)components are caused by different magnetization effects.The low frequency component has strong desplacement sensor response coincident with the rate of magnetic induction,suggesting magnetization via the discontinuous motion of domain walls.The high frequency component has strong shear sensor response and is observed near magnetic saturation,suggesting rotational magnetization effect.
LectureMaterials Evaluation by Acoustic Emission MethodUnrefereedOtherSingle-AuthorTAKUMA Masanori2002/3/23~The AE method for evaluating the soudness of the structural member parts is introduced.And the examples of the application for those techniques that are fractal theory,nerural network and wavelet transform,etc.,are discussed,when detected signal is processed.
Research reportEvalution on Fracture Characteristics of TiN Ceramics Film with Scrach Testing -Evaluation of Scratch Mark Condition by AE Signals-UnrefereedIn-house publicationCo-authorTAKUMA Masanori;Noboru SHINKEFuzzy Theory;Fracture Characteristics;Evaluation;Scratch Testing;TiN Film;Ceramics;Wavelet Transform;Acoustic EmissionTechnical Report of Ceramics Film()/,192002/3/20~ORDIST of KANSAI UNIVERSITYMany of the ceramic coating materials can be exposed to harsh working conditions. Therefore, for producing superior coating materials, it is necessary to establish a methodology for evaluating the mechanical properties of these materials. Until the former report, nine kinds of TiN film 5m thick, which were deposited on the different parent materials under defferent N2 partial pressure, were scratched and the relationship between the characteristics of the detected acoustic emission (AE) signals and the fracture modes of the film (i.e. cracking, chipping and flaking) was investigated. As the results, the following things became clear: (1) the fracture modes were classified by fractal dimension m detemined AE peak amplitude distributions. (2) the changes of the fracture mode were evaluated by observing the analysis with wavelet transform (WT). In this report, time fluctuation signals of wavelet coefficient, multiple analysis and fuzzy reasoning were used to evaluate the scratch mark conditions. From the experimental results, it was found that the conditions were evaluated by this method.
Research reportEvaluation of Bending Fatigue Damage for FRP with AE
-Application of Wavelet Transform-UnrefereedIn-house publicationSingle-AuthorTAKUMA MasanoriWavelet Transform;Composite Materials;Acoustic Emission;Materia Evaluation;Bending;Fatigue;Nondestructive InspectionTechnical Report of Life Cycle Engineering (I)/I,282002/3/20~ORDIST of KANSAI UNIVERSITYFiber reinforced plastics (FRP) has become one of the important structural materials in the various fields. Therefore, it is important to evaluate the fracture modes and the fatigue damage of FRP laminates. Acoustic emission (AE) monitoring is useful to study the modes and it is required that we should go on with the study of more elaborate information processing method for evaluating its damage and fracture modes with the AE signals. However, it is difficult to evaluate the damage and the modes during the fatigue testing because the detected signals include the environmental noise during the testing. Recently, Wavelet Transform (WT) are the center of attention at the analysis of the signals. The resultant mapping of wavelet coefficients in the time-frequency coordinate plane provides more informative characterization of the signals than the power-density spectra from usual Fourier Transform.
In this report, the AE signals of CFRP and GFRP laminates (i.e.[0°],[0°/90°] and [±45°]) subjecting to cyclic bending loads were recorded at each cycle during the cyclic bending testing, and were analyzed with WT for evaluating its damage and fracture modes. By observing the resultant mapping of the wavelet coefficients in the time-frequency coordinate plane at each cycle, the following things become clear; (1) We could discriminate the different signals by the fatigue damage and the fracture modes at a glance because the mapping illustrated the characteristic features of the signals. (2) It was proved with WT that the several fracture modes and the time difference of which the each fracture mode occur exist in a signal. (3)By using the presented method, it was probved to be able to recognize the fatigue damage and the fracture mode of the laminates with nondestructive inspection. From the above-mentioned result, it is possible to develop a methodology for evaluating the damage and the modes using the characteristic features of the mapping.
Academic presentationEvaluation of Bending Fatigue Damage for FRP Laminated Plates with AE(Application of Fractal Dimension and Neural Network)UnrefereedAcademic JournalCo-authorTAKUMA Masanori;Noboru SHINKEEvaluation;Neural Network;Fractal Dimension;Acoustic Emission;FRP Laminated Plates;Bending Fatigue DamageJapanese Society for Non-destructive Inspection/13,92001/10/2~13th Acoustic Emission ConfarenceThe detected AE signals during the bending fatigue test of CFRP and GFRP laminated plates were analyzed with wavelet transform(i.e.WT),and the fractal dimension was used for the quantitative features expresiion of WT results.Then,neural network which evaluate the fatigue damage from the quantitative features of the results and layered structure was constructed,and the effectiveness was clarified by the collation with the experimental result.
PapersBasic Study on Damage Restraint of Coating Film(Adoption of Smart Material)In refereedAcademic JournalCo-authorTAKUMA Masanori;Noboru SHINKE;Motoaki KIMURA;Yoshikazu NIWACoating Film;Smart Structure;Smart Material;Bending;Crack Propagation;Acoustic Emission;Shape Memory AlloyTransactions of the Japan Society of Mechanical Engineers(Series A)67/660,13452001/8/5~Japan Society of Mechanical EngineersRecently,coating materials have been noticed,and are widely used in the several fields.However,it is being taken up as a serious problem that the large-scale destruction of the structure will be occurred at the time when the damage of the coating film generates.On the other hand,the new concept on the active damage control,which the structure member parts adapt itself to the environmental conditions,has been exposed to the attention in the material science.In this concept,they have the function such as a living organism,and do the work in proportion to the environment in the circumference.They are called smart material or smart structure.In short,it denotes that they have the sense organ for detecting the damage in itself,the processor organ for deducing a suitable signal for the damage and the actuator organ for restraining the damage.Therefore,it is a possible by applying the concept of the smart materials and structures to actively restrain or restore the damage.In this study,the basic study on the damage restraint of coating film is proposed.In short,by adopting this concept,the efficiency of actively restoring the damage of the film is reported.
PapersStudy on Cracks Repair with Laser Irradiation in Alumina Ceramics (Evaluation of Repairing Conditions by Acoustic Emission Monitoring)In refereedAcademic JournalCo-authorTAKUMA Masanori;Noboru SHINKE;Hiromitsu MIYAJIMAEvaluation;Crack Repair;4-Point Bending Test;YAG Laser;Ceramics;Crack Propagation;Acoustic EmissionTransactions of the Japan Society of Mechanical Engineers(SeriesA)67/657,9062001/5/5~Japan Society of Mechanical EngineersStructural ceramics are attracting attention in the development of space ships,aircraft and nuclear fusion reactors because they have excellent heat-resistant characteristics.Therefore,various structural ceramics have been developed as heat-resistant materials.Especially,ceramics coating materials are widely used because the materials have the characteristics of the both the base materials and the coating materials.However,the ceramics are damaged easily by the thermal stress result from the thermal shock.Therefore,it is necessary to understand their thermal shock properties and to investigate their thermal shock characteristics.In this report,it is discussed to evaluate the cyclic fatigue damage(i.e. crack initiation,crack growth and fracture)for TiN ceramic film during the repeated thermal shock tests.Concurrently with the repeated shocks that irradiated the coating surface wigh YAG laser,acoustic emission(AE) monitoring was carried out to detect the onset of the thermal shock damage,and the surface apperance was assessed by optical micoscope observations.Wavelet Transform(WT) was applied for distinguishiing the signals on damage of TiN from a signal on thermal shock in the first 5 msec of the detected signals.After this processing,the features of the AE signals on the damage of TiN film were analyzed.As the results,it was found that the fatigue damage during the theramal shock tests were evaluated by monitoring the 3-D data which represented the relationship between the slope of amplitude distribution of AE signal,AE events and the number of the repeated thermal shock.
Research reportEvaluation on Fracture Characteristics of TiN Ceramics Film with Scratch Testing -Application of AE Method-UnrefereedIn-house publicationCo-authorTAKUMA Masanori;Noboru SHINKEFracture Characteristics;Evaluation;Scratch Testing;TiN Film;Ceramics;Wavelet Transform;Acoustic EmissionTechnical Report of Ceramics Film()/,192001/3/20~ORDIST of KANSAI UNIVERSITYMany of the ceramic coating materials can be exposed to harsh working conditions.Therefore,for producing superior coating materials,it is necessary to establish a methodology for evaluating the mechanical properties of these materials.Until the former report,nine kinds of TiN film 5μm thick,which were deposited on the different parent materials under different N2 partial pressure,were scratched and the relationship between the characteristics of the detected acoustic emission(AE) signals and the fracrure modes of the film(i.e.cracking,chipping and flaking) was investigated.As the results,the following things became clear:(1)the fracture modes were classified by fractal dimension m determined AE peak amplitude distributions.(2)the changes of the fracture mode were evaluated by observing the analysis with wavelet transform(WT).In this report,time fluctuation signals of wavelet coefficient,multiple analysis and fuzzy reasoning were used to evaluate the scratch mark conditions.From the experimental results,it was found that the conditions were evaluated by this method.
Research reportBasic Study on Damage Restraint of Coating Film-Adoption of Smart Material-In refereedIn-house publicationCo-authorTAKUMA Masanori;Noboru SHINKE;Motoaki KIMURA;Yoshikazu NIWASmart Material;Coating Film;Damage RestraintTechnology Reports of KANSAI UNIVERSITY/43,112001/3/20~The new concept on the active damage control,which the structure member parts adapt itself to the environmental conditions,has been exposed to the attention in the material science.The concept is called smart material or smart structure.By introducing the concept,it is possible that the material and the structure have the functions(i.e.,sense,thinking and action)such as a living organism.On the other hand,it is very important to evaluate the fracture and he damage of the coating material,because the enormous damage to society activity is caused by the destruction of the material.In this study,the basic study on the damage restraint of coating film is proposed.The material has a sensor,a processor and actuators,where the sensor detects the damage,the processor deduces a suitable signal in proportion to the damage and the actuator takes an action on the basis of the deduced signal.The effect on the damage restraint of the film is considered from the experimental results.
Research reportBasic Study on Structual Recognition of Functionally Gradient Material -Adoption of Acoustic Emission in Scratch Testing-In refereedIn-house publicationCo-authorTAKUMA Masanori;Noboru SHINKE;Hidenobu KUROIScratch Testing;Acoustic Emission;Functionally Gradient Material;Structural RecognitionTechnology Reports of KANSAI UNIVERSITY/43,212001/3/20~Functionally gradient material(FGM),which the mechanical properties change from the surface to the inside,is exposed to harsh working conditions because of its excellent characteristics.Therefore,in order to produce the superior FGM,it is necessary to establish a methodology for recognizing the internal conformation.In this study,fiber-reinforced plastic(FRP) laminated materials were used as a substitute for FGM.The specimens,which the fiber reinforced sheets of carbon and glass were layered ,were scratched.And a method for recognizing the internal conformation with acoustic emission(AE) was proposed.The result were as follows:(1)the relationships between the characteristics of the detected AE signals and the kinds of specimen were investigated;(2)it was clarified that the fractal demension m determined from AE peak amplitude distribusions change depend on the kinds of fiber in the material.From these experimental results,it was found that the conformational recognition of the material could be evaluated from the fractal demension m determined by scratch testing.
LectureEvaluation of Bending Fatigue Damage from FRP with AEUnrefereedOtherCo-authorTAKUMA Masanori;Noboru SHINKEEvaluation;AE;FRP;Bending Fatigue DamageAcoustic Emission Special Research Committee.published by Japanese Society for Non-destructive Inspection/114,192001/3/15~Japanese Society for Non-destructive InspectionCFRP occupies the important position as a structural material.However,the research on elucidation of the fracture mechanism by the fatigue and evaluation of the damage is being mentioned as an important problem.In this study,AE signals which arose under bending fatigue test of CFRP laminate plates of which the structural property was differs([0°],[0°/90°],[±45°]) were detected.The model which evaluated the fatigue damage and fracture mechanism was constructed with wavelet transform that can grasp the time information of frequency component,and the effectiveness of the model was clarified by the collation with the experimental result.
PapersEvaluation of Fracture Characteristics of TiN Ceramics Film with Scratch Testing (Application of Fractal Dimension of AE Peak Amplitude Distribution)In refereedAcademic JournalCo-authorTAKUMA Masanori;Noboru SHINKE;Akira YONEKURA;Hideaki YOSHIDAFracture Characteristics;Evaluation;Scrach Testing;TiN Film;Ceramics;Fractal;Acoustic EmissionJSME International Journal SeriesA44/1,1232001/1/4~Japan Society of Mechanical EngineersMany of the ceramic coating materials can be exposed to harsh working conditions because of their excellent characteristics.Therefore,for producing superior coating materials,it is necessary to establish a methodology fo evaluating the mechanical properties of these materials.In this study,nine kinds of TiN film of 5m thickness,which were deposited on different parent materials under differrent N2 partial pressures,were scratched and a method for evaluating the properties of the coating materials with acoustic emission(AE) was developed.The results were as follows:(1)A scratch testing apparatus that can detect AE signals emitted from the TiN film during scratch testing was fabricated.(2)The relationship between the characteristics of the detected AE signals and the fracture modes of the film(i.e.,cracking,chipping and flaking) was investigated.(3)It was clarified that fractal dimension mdetermined from AE peak amplitude distributions became greater than three when the fracture mode was cracking,the dimension became between one and three when the mode was chipping,and the dimension became less than one when the mode was flaking.From these experimental results,it was found that the strength and the adhesivity of thin film can be evaluated from fractal dimension m determined by scratch testing.
PapersEvaluation of Bending Fatigue Damage for FRP with AE
(2nd Report-Application of Neural Network and Fractal Dimension of Wavelet)In refereedAcademic JournalCo-authorTAKUMA Masanori;Noboru SHINKE;Nobuyuki NAKAMURA;Hideki NAKAZONOWavelet Transform;Acoustic Emission;Fatigue Damage;Material Evaluation;Composite Material;Nondestructive Inspection;Neural Network;Fractal DimensionJournal of the Japanese Society for Non-destructive Inspection49/12,8542000/12/10~Japanese Society for Non-destructive InspectionCarbon-fiber reinforced plastic (CFRP) has become an important structural material in various fields.Therefore,it is important to evaluate the fracture modes and the fatigue damage of CFRP laminates.In the previous paper,the acoustic emission(AE) singals of CFRP laminates (i.e.[0]11 , [0/90]11 and [±45]11 )subjected to cycle bending loads were recorded at each cycle during the fatigue test,and were analyzed by wavelet transform(WT) to evaluate the damage and fracture modes.By observing the resultant mapping of wavelet coefficients in the time-frequency coordinate plane at each cycle,it was proved possible to recognize the damage and the modes of CFRP laminates using nondestructive inspection.The purpose of this paper is to develop a methodology for evaluating fatigue damage and fracture modes using the characteristic features of the mapping.This system consists of an AE measuring device and a neural network.The network has learned the pattern sets dealing with the interaction between the features of the mapping and the fatigue damage.The character of the mapping expressed by wavelet coefficients in the time-frequency coordinate plane is bracketed wording clear scientifically by fractal demensions that were led by the box-counting method in fractal theory.The effectiveness of this system is demonstrated by comparing results of the neural network with experimental data obtained from the fatigue tests.
Academic presentationWavelet Transform Analysis of Magneto-mechanical Acoustic Emission Signals from Displacement and Shear SensorsIn refereedAcademic JournalCo-authorTAKUMA Masanori;Noboru SHINKE;Ryuuich INOUE;Kaniji ONO;Yoshinobu OHARAShear Type Sensor;Displacement Type Sensor;Wavelet Transform;Magneto-mechanical Acoustic EmissionProgress in Acoustic Emission/,992000/11/14~15th International Acoustic Emission SymposiumIn assuring the safety of a structure, it is important to evaluate the state of structural members non-destructively by magneto-acoustic emission (MAE). MAE is useful in NDT, because it reflects minute changes of stress and microstructure of ferrous materials. We studied MAE signals of a pure iron using displacement and shear sensors, for the detection of the longitudinal and shear components of the signals, which were analyzed by wavelet transform. The mapping of wavelet coefficients in the time-frequency coordinate plane provides informative characterization of the signals. From the analysis, we found that the low (150 to 300 kHz) and high frequency (400 to 800 kHz) components are caused by different magnetization effects. The low frequency component has strong displacement sensor response coincident with the rate of magnetic induction, suggesting magnetization via the discontinuous motion of domain walls. The high frequency component has strong shear sensor response and is observed near magnetic saturation, suggesting rotational magnetization effect.
PapersEvaluation on Fracture Characterristics of TiN ceramics Film with Scratch Testing (2nd Report,Application of Wavelet Transform of AE Signals)In refereedAcademic JournalCo-authorTAKUMA Masanori;Noboru SHINKE;Takahiro KUBO;Akira YONEKURA;Seiki KAWAIFracture Characteristics;Evaluation;Scratch Testing;TiN Film;Ceramics;Wevelet Transform;Acoustic EmissionTransactions of the Japan Society of Mechanical Engineers(SeriesA)66/651,20742000/11/5~The Japan Society of Mechanical EngineersMany of the ceramic coating materials can be exposed to harsh working conditions because of their excellent characteristics.Therefore,for producing superior coating materials,it is necessary to establish a methodology for evaluating the mechanical properties of these materials.In the former report,nine kinds of TiN film 5m thick,which were deposited on the different parent materials under different N2 partial pressure,were scratched and the relaionship between the characteristics of the detected acoustic emission(AE) signals and the fracture modes of th film(i.e. cracking,chipping and flaking) was investigated.As the results,it was clarified that fractal dimension m determined AE peak amplitude disributions became grater than three when the fracture mode was cracking,the dimension became between one and three when the mode was chipping,and the dimension became less than one when the mode was flaking.However,it is necessary for evaluating the fracture mechanism to recognize the information on the changes of the fracture modes which is included in an AE event.In this report,wavelet transform(WT) was used to attain the subject.From the experimental results,it was found that the changes of the fracture mode are evaluated by observing the time-frequency analysis with WT.
Research reportNon-Destructive Evaluation by Ultrasonic Inspection of Tension Shearing Strength of Spot-Welded Joints -Application of Fractal Dimension and Neural Network-UnrefereedIn-house publicationCo-authorTAKUMA Masanori;SHINKE/NoboruSpot-welded;Neural Network;Fractal Dimension;Non-destructive Evaluation;Ultrasonic Inspection;Tension Shearing StrengthTechnology Reports of Kansai University/42,12000/3/20~The spot-welded joint is widely used as a structural part in any manufacturing fields.
In quality control of such joints, one of the most important aspects is to be able to accurately estimate the connective strength using information obtained by non-destructive testing. In this report, a system based on an ultrasonic inspection device and a neural network is proposed for evaluation of the tension-shearing load of each spot-welded joint. The input of the network is the fractal dimension of the scanning data and the output of the network is the load of the joint. The effectiveness of the system was confirmed by comparing the output with experimental results.
Research reportEstimation of Stress Imposed on a Structure's Member Parts by Magnetomechanical Acoustic Emission -Application of Displacement Sensor and Wavelet Transform-UnrefereedIn-house publicationCo-authorTAKUMA Masanori;SHINKE/NoboruWavelet Transform;Displacement Sensor;Evaluation;Stress Imposed;Structure's Member Parts;Magnetonechanical Acoustic EmissionTechnology Reports of Kansai University/42,172000/3/20~The discontinuous motion of magnetic domain walls in ferromagnetic materials during magnetization produces acoustic emission (MAE). MAE behavior is influenced by the slightest change in the structure of materials. In this report, we describe a potential method for stress measurement using wavelet transform (WT) of the MAE signal. The MAE signals of carbon steel were measured with a displacement sensor at each tensile stress within the elastic region. It was clear from the results that the wavelet coefficients in the time-frequency coordinate plane illustrate the characteristic features of the signals. Therefore, we could show that the stress of a structure's member parts can be evaluated by monitoring the coefficients
Research reportStudy on Material Evaluation with Acoustic Emission MethodUnrefereedIn-house publicationCo-authorTAKUMA Masanori;SHINKE/Noboru;KIMURA/Motoaki;KUROI/Hidenobu;NAKAMURA/Nobuyuki;MIYAJIMA/Hiromitu;INOUE/Ruyuich;KUBO/Takahiro;FUKUROTANI/TakujiMaterial Evaluation;Acoustic EmissionEngineering Technology (Technology Reports of Kansai University)/102,72000/1/31~The mechanism and the progress of the damage of the structural member part are different by the kind of material, environment and operating history. But the countermeasure has mainly been taken further than the design state in the stage of operation and maintenance. Therefore, the non-destructive inspection that grasps and evaluates degradation condition of member subject will be the important role for the security of safety and reliability of the structure. From such fact, AE (Acoustic Emission) method which processes the elastic wave in deformation and destruction is noticed. AE method has the following feature: it is possible to detect the defect in the narrow place which cannot put the measurement machine and position, and to grasp the crack propagation. Therefore, the development of the method is advanced. The themes in our laboratory (i.e. fractal analysis of the AE signal, wavelet transform of the AE signal and role of AE in smart structure and material) are introduced.
PapersEvaluation of Bending Fatigue Damage for FRP with AE (1st report -Application of Wavelet Transform)In refereedAcademic JournalCo-authorTAKUMA Masanori;SHINKE/Noboru;NAKAMURA/NobuyukiWavelet Transform;Composite Material;Acoustic Emission;Materials Evaluation;Fatigue Fracture;Nondestructive InspectionJournal of the Japanese Society for Non-destructive Inspection48/12,8621999/12/1~The Japanese Society for Non-destructive InspectionCarbon fiber reinforced plastics (CFRP) has become one of the important structural materials in the various fields. Therefore, it is important to evaluate the fracture modes and the fatigue damage of CFRP laminates. Acoustic emission (AE) monitoring is useful to study the modes and it is required that we should go on with the study of more elaborate information processing method for evaluating its damage and fracture modes with the AE signals. However, it is difficult to evaluate the damage and the modes during the fatigue testing because the detected signals include the environmental noise during the testing. Recently, Wavelet Transform (WT) is the center of attention at the analysis of the signals.
The resultant mapping of wavelet coefficients in the time-frequency coordinate plane provides more informative characterization of the signals than the power-density spectra from usual Fourier Transform. In this study, the AE signals of CERP laminates (i.e. [0]11, [0/90]11 and [45]11) subjecting to cyclic bending loads were recorded at each cycle during the cyclic bending testing, and were analyzed with WT for evaluating its damage and fracture modes. By observing the resultant mapping of the coefficients at each cycle, the following things became clear; (1)We could discriminate the different signals by the fatigue damage and the fracture modes at a glance because the mapping illustrated the characteristic features of the signals. (2)It was proved with WT that the several fracture modes and the time difference of which the each fracture mode occur exit in a signal. (3)By using the presented method, it was proved to be able to recognize the fatigue damage and the fracture mode of CFRP laminates with nondestructive inspection.
Academic presentationEvaluation of Bending Fatigue Damage for FRP with AE -Application of wavelet transform-UnrefereedAcademic JournalCo-authorTAKUMA Masanori;SHINKE/Noboru;NAKAMURA/NobuyukiAcoustic Emission;Wavelet Transform;Damage Evaluation;Bending Fatigue;FRP Laminated Plate1999 National Conference on Acoustic Emission12/,531999/11/18~The Japanese Society for Non-destructive InspectionThe frequent occurrence of impossible expecting trouble becomes a problem, because fatigue breakdown of the FRP which is generated in each place of reinforced fiber and fiber/resin interface and resin is very complicated. In this study, wavelet transform of the detected AE signals during fatigue test of the FRP laminated plate is done. And the result reports fracture mechanism and result of examining whether it is effective for evaluating the damage.
Academic presentationStudy on Non-destructive Evaluation of Structure's Member Parts Using Magnetomechanical Acoustic Emission
-Observation of MAE Signals with Displacement AE Traducer and Wavelet Transform-UnrefereedAcademic JournalCo-authorTAKUMA Masanori;SHINKE/Noboru;INOUE/Ryuuich;ONO/Kanji;OHARA/YoshinobuWavelet Transform;Displacement Tranducer;Non-destructive Evalution;Structure's Member Parts;Magnetomechanical Acoustic Emission1999 National Conference on Acoustic Emission12/,1131999/11/18~The Japanese Society for Non-destructive InspectionThere is the magnetism AE (MAE) method in one of the techniques which detect the microscopic structural change of ferromagnetic material. In this study, MAE detected by displacement sensor and Shear sensor was analyzed in FFT and wavelet transform (WT). Based on the analytical result, the behavior of MAE is examined, and the possibility of the non-destructive inspection by MAE is reported.
PapersEvaluation on Fracture Characteristics of TiN Ceramics Film with Scratch Testing (1st Report, Application of Fractal Dimensions of AE amplitude Distribution)In refereedAcademic JournalCo-authorTAKUMA Masanori;SHINKE/Noboru;YONEKURA/Akira;YOSHIDA/Hideaki;KAWAI/SeikiFracture Characteristics;Evalution;Scrach Testing;TiN Film;Ceramics;Fractal;Acoustic EmissionJSME, Series A65/636.16961999/8/25~The Japan Society of Mechanical EngineeringMany of the ceramics coating materials are in use under the hard working conditions on the ground that these materials have the excellent characteristics. Therefore, it is expected for producing the superior coating materials to establish a methodology for evaluating the mechanical properties of these materials. In this report, 9 kinds of TiN film 5m thick that were deposited on the different parent materials under the different N2 partial pressure were scratched and a method for evaluating the properties of the coating materials with Acoustic Emission (AE) is described. Its contents are follows: (1) The scratch testing apparatus that can detect the emitted AE signals from the TiN film during the testing was produced. (2) The relationship between the character of the detected AE signals and the fracture types of film (i.e. crack, chipping and flaking) were investigated. (3) It was became clear that the fractal dimension m led from AE amplitude distribution shows more than 3 when the fracture type is crack, the value shows between 1 and 3 when the type is chipping, the value shows less than 1 when the type is flaking. From these experimental results, it was found that the strength and the tight-adhesiveness of thin film are evaluated by observing the fractal dimensions of AE amplitude distribution during the scratch testing.
Academic presentationStudy on Estimation of Stress Imposed on Member Parts with Magnetomechanical Acoustic EmissionUnrefereedAcademic JournalCo-authorTAKUMA Masanori;SHINKE/Noboru;OHARA/Yoshinobu;KATOH/Hironori;TAMARU/KouheiEstimation of Stress Imposed;Member Parts;Magnetomechanical Acoustic EmissionThe 74th JSME Kansai Branch Annual Meeting/994-1,251999/3/18~The Japan Society of Mechanical Engineering, Kansai BranchAcoustic emission monitoring is useful to study the fracture modes and kinetics in various materials. The discontinuous motion of magnetic domain walls in ferromagnetic materials during magnetization produces the emission that is called Magnetomecanical Acoustic Emission (MAE). MAE behavior shows a sensitive dependence on the change of the structure in ferromagnetic materials. Our aim is to estimate the accurate stress imposed on the structure's member parts with MAW sensor are powerful new method for estimating the accurate stress during the elastic region. From the results of WT of the signals, it was became clear that we could discriminate the different signals by applying tensile stress because the mapping of wavelet coefficients in the time-frequency plane illustrated the characteristic features of the signals. Therefore, we could find out a possibility of which the accurate stress will be estimated by monitoring the features of the map.
Academic presentationEvaluation for Bending Fatigue Damage of FRP Laminated Plates with Acoustic Emission Method -Application of Wavelet Transform-UnrefereedAcademic JournalCo-authorTAKUMA Masanori;NAKAMURA/Nobuyuki;SHINKE/Noboru;KASHIUCH/Takamitu;MIZUKAMI/RyouEvaluation for Bending Fatigue Damage;Fiber Reinforced Plastic Laminated;Acoustic Emission Method;Wavelet TransformThe 74th JSME Kansai Branch Annual Meeting/994-1,391999/3/18~The Japan Society of Mechanical Engineering, Kansai BranchCarbon fiber reinforced plastics (CFRP) has become one of the important structural materials in various fields. Therefore, it is important to evaluate the fracture modes and fatigue damage of CFRP. Acoustic emission monitoring is useful to study the modes in various materials. However, it is required that we should go on with the study of more elaborate information processing method for measuring its damage and fracture with AE signals. Recently, Wavelet Transform (WT) is the center of attention at the analysis of the signals. The resultant mapping of wavelet coefficients in the time-frequency coordinate plane provides more informative characterization of the signals than the power- density spectra from usual Fourier Transform. In this study, the signals of CFRP were recorded at each fatigue cycle, and were analyzed with WT. By observing the resultant mapping of the coefficients at each cycle, it was became clear that we could discriminate the different signals by fatigue damage and fracture modes at a glance because the mapping illustrated the characteristic features of the signals.
Academic presentationStudy on Magnetomechanical Acoustic EmissionUnrefereedAcademic JournalCo-authorTAKUMA Masanori;MATUURA/Takayuki;SHINKE/Noboru;OHARA/Yoshinobu;INOUE/Ryuuich;HASHIMOTO/EisukeMagnetomechanical Acoustic EmissionThe 74th JSME Kansai Branch Annual Meeting/994-1,431999/3/18~The Japan Society of Mechanical Engineering, Kansai BranchIt is important for evaluating the safety of the structure to detect the change of the microstructure in the member parts with nondestructive testing (NDT). Magnetomechanical Acoustic Emission (MAE) is one of the useful methods for NDT and its behavior shows a sensitive dependence on the change of the structure in ferromagnetic materials. However, the mechanism on the occurrence and character of MAE do not have been become clear and the method of NDT with MAE is not established. Recently, Displacement sensor and Wavelet Transform (WT) are the center of attention at the measurement and the analysis of AE signals. The sensor detects only the elastic energy by magnetostriction that is origin of the 90 domain wall motion and rotation of local magnetization in the materials during magnetization. In this report, the detected MAE signals with sensor were analyzed by FET and WT. As the results, it was became clear that the frequency range of the 90 domain wall motion and rotation of local magnetization are different and we could find out a possibility of which the mechanism of the occurrence of MAE will be clear.
Academic presentationEvaluation on Fracture Characteristics of TiN Ceramics Film Using Acoustic Emission (Application of Scratch Testing)UnrefereedAcademic JournalCo-authorTAKUMA Masanori;YOSHIDA/Hideaki;SHINKE/Noboru;YONEKURA/Akira;KUBO/Takahiro;GOMI/KazuoScratchi Testing;Fracture Characteristic Evaluation;Film;TiN Ceramics;Acoustic Emission MethodThe 74th JSME Kansai Branch Annual Meeting/994-1,471999/3/18~The Japan Society of Mechanical Engineering, Kansai BranchMany of the ceramics coating material are in use under the hard working g conditions because the materials have the excellent characteristics. Therefore, it is expected for producing the superior coating materials to establish a methodology for evaluating the mechanical properties of the materials. In this report, TiN film 5m thick were scratched and the relationship between the results of Wavelet Transform of the detected AE signals and the fracture types of film (i. e crack,. chipping and flanking) were investigated.
As the results, it was became clear that we could discriminate the different signals of each fracture type at a glance because the mapping of wavelet coefficients in the time-frequency plane illustrated the characteristic features of the detected AE signals. Therefore, we could find out a possibility of which the accurate fracture type will be evaluated by monitoring the features of the map during the scratch testing.
Academic presentationEvaluation on Thermal Shock Damage of TiN Ceramics Film by Repeated Laser IrradiationUnrefereedAcademic JournalCo-authorTAKUMA Masanori;MIYAJIMA/Hiromitu;SHINKE/Noboru;MATUMOTO/MasajiEvaluation;Film;TiN Ceramics;Repeated Thermal ShockThe 74th JSME Kansai Branch Annual Meeting/994-1,491999/3/18~The Japan Society of Mechanical Engineering, Kansai BranchCeramics films are damaged easily by the thermal shock. In this report, it is discussed to evaluate the cyclic fatigue damage for TiN ceramics film during the repeated thermal shock tests. Concurrently with the repeated shocks that irradiated the coating surface with YAG laser, acoustic emission (AE) monitoring was carried out to detect the onset of the thermal shock damage, and the surface appearance was assessed by optical microscope observations Wavelet Transform (WT) was applied for distinguishing the signals on damage of TiN from a signal on thermal shock in the first 5 msec of the detected signals. After the processing, the features of the signals on the damage were analyzed.
As the results, it was found that the fatigue damage during the tests were evaluated by monitoring the 3-D data which represented the relationship between the slope of amplitude distribution of AE signal. AE events and the number of the repeated thermal shock.
PapersEvaluation on Thermal Shock Damage of TiN Ceramics Film by Repeated Loser Irradiation(1st Repoet, Application of Navelet Transform and AE Features)In refereedAcademic JournalCo-authorTAKUMA Masanori;SHINKE/Noboru;MIYAJIMA/Hiromitu;KAWAI/SeikiWavelet Transform;Laser;Film;Damage;Thermal Shock;Ceramics;Acoustic EmissionTRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS(series A)64/628,29451998/12/25~The Japan Society of Mechanical EngineeringStructural ceramics are attracting attention in the development of space ships, aircraft and nuclear fusion reactors because they have excellent heat-resistant characteristics. Therefore, various structural ceramic have been developed as heat-resistant materials. Especially, ceramics coating materials are widely used because the materials have the characteristics of both the base materials and the coating materials. However, the ceramics are damaged easily by the thermal stress result from the thermal shock. Therefore, it is necessary to understand their thermal shock properties and to investigate their thermal shock characteristics. In this report, it is discussed to evaluate the cyclic fatigue damage (i.e. crack initiation, crack growth and fracture) for TiN ceramic film during the repeated thermal shock tests. Concurrently with the repeated shocks that irradiated the coating surface with YAG laser, acoustic emission (AE) monitoring was carried out to detect the onset of the thermal shock damage, and the surface appearance was assessed by optical microscope observations. Wavelet Transform (WT) was applied for distinguishing the signals on damage of TiN from a signal on thermal shock in the first 5 msec of the detected signals. After this processing, the features of the AE signals on the damage of TiN film were analyzed. As the results, it was found that the fatigue damage during the thermal shock tests were evaluated by monitoring 3-D data which represented the relationship between the slope of amplitude distribution of AE signal, AE events and the number of the repeated thermal shock.
PapersNondestructive Evaluation of Fatigue Damage and Conditions Using Magnetic Properties and Magnetomechanical Acoustic Emission(Application of Neural Network for Low Cycle Fatigue)In refereedAcademic JournalCo-authorTAKUMA Masanori;SHINKE/NoboruMangetic Properties;Acoustic Emission;Neural Network;Nondestructive Inspection;Low Cycle Fatigue;Material Testing;Structural ReliabilityTRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS(Series A)64/627,28621998/11/25~The Japan Society of Mechanical EngineeringIt is very important to evaluate damage levels of structures for prediction of fatigue fracture. Purpose of this study is to develop a methodology for evaluating fatigue damage and conditions by a nondestructive inspection technique. Low cycle fatigue test were conducted for carbon steel specimens (0.15 and 0.45 wt% carbon) under various fatigue conditions. During the tests, magnetic properties and a magnetomechanical acoustic emission were measured at predetermined number of cycles. The test results exhibited 480 pattern sets which describe the relationship between the measured parameters and the fatigue information such as the damage level (Cycle ratio N/Nf), the stress amplitude (a) and the stress ratio (R). A nondestructive evaluation system consisting of measuring and a neural network was proposed. The effectiveness of this system was demonstrated by comparing results of the neural network with experimental data obtained from the fatigue tests.
PapersStudy on Support System for Design of Composite Laminated Plate(1st Report, Application of Genetic Algorithm and Neural Network)In refereedAcademic JournalCo-authorTAKUMA Masanori;SHINKE/Noboru;OCHI/KouichiGenetic Algorithm;Neural Network;Laminated Construction;Material Design;Reinforced Plastic;Composite MaterialTRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS(series A)64/624,20801998/8/25~The Japan Society of Mechanical EngineeringRecently composite laminated plates made from the prepreg sheet of the woven fabric have been produced and used. When the materials are used, the laminated construction must be optimized to use it effectively. The purpose of this study it to propose the support system for the design of the laminated construction of the woven fabric (i.e. Carbon, Glass and Aramid). The system consists of Genetic Algorithm and Neural Network. By repeating the following two sequences, the designs that satisfied the required mechanical properties are searched. (1)The character of the laminated construction of the woven fabric that was expressed by binary number is produced according to Genetic Algorithm. (2)The fitness grade of the designs to the required properties are evaluated by Neural Network. The network has learned the pattern information which is expressed by the relationship between the codes and the mechanical properties (density and tensile strength). The several composite laminated plates which were recommended by this system were produced, and the properties of the plates were measured. As the results, it was proven that the measurements are close to the required properties, and the validity of the system was confirmed.
PapersWavelet Transform of Magnetomechanical Acoustic Emission under Elastic Tensile Stress with Displacement SensorIn refereedAcademic JournalCo-authorTAKUMA Masanori;SHINKE/Noboru;ONO/KanjiTensile Stress;Displacement Sensor;Wavelet Transrform;Magnetomechanical Acoustic EmissionPROGRESS in ACOUSTIC EMISSIONIX/III,201998/8/9~International Acoustic Emission Symposium and Acoustic Emission World MeetingAcoustic emission monitoring is useful to study the fracture modes and kinetics in various materials. The discontinuous motion of magnetic domain walls in ferromagnetic materials during magnetization produces Acoustic Emission. The emission is called Magnetomechanical Acoustic Emission (MAE). MAE behavior shows a sensitive dependence on the change of the structure in ferromagnetic materials. Our aim is to estimate the accurate stress imposed on the structure's member parts by monitoring MAE signals. IN this report, it is described whether Wavelet Transform (WT) of MAE signals is powerful new method for estimating the accurate stress. The MAE signals of carbon steel were measured with a displacement sensor at each tensile stress during the elastic region.
From the results of WT of the signals, it was became clear that we could discriminate the different signals by applying tensile stress at a glance because the mapping of wavelet coefficients in the time-frequency plane illustrated the characteristic features of the signals.
Therefore, we could find out possibility of which the accurate stress imposed on the structure's member parts will be estimated by monitoring the features of the map.
Academic presentationWavelet Transform of Magnetomechanical Acoustic Emission under Elastic Tensile Stress with Displacement SensorIn refereedAcademic JournalCo-authorTAKUMA Masanori;SHINKE/Noboru;ONO/KanjiWavelet Transform;Magnetomechanical Acoustic Emission;Elastic Tensile Stress;Displacement Type Sensor14th International Acoustic Emission Symposiu & th Acoustic Emission World Meeting,20.1998/8/9~International Acoustic Emission ConferenceAcoustic emission monitoring is useful to study the fracture modes and kinetics in various materials. The discontinuous motion of magnetic domain walls in ferromagnetic materials during magnetization produces Acoustic Emission. The emission is called Magnetomechanical Acoustic Emission (MAE). MAE behavior shows a sensitive dependence on the change of the structure in ferromagnetic materials. Our aim is to estimate the accurate stress imposed on the structure's member parts by monitoring MAE signals. In this report, it is described whether Wavelet Transform (WT) of MAE signals is powerful new method for estimating the accurate stress. The MAE signals of carbon steel were measured with a displacement sensor at each tensile stress during the elastic region.
From the results of WT of the signals, it was became clear that we could discriminate the different signals by applying tensile stress at a glance because the mapping of wavelet coefficients in the time-frequency plane illustrated the characteristic features of the signals.
Therefore, we could fine out a Possibility of which the accurate stress imposed on the structure's member parts will be estimated by monitoring the features of the map.
PapersEvaluation of Function of Spot-Welded Joint Using Ultrasonic Inspection (2nd Report, Nondestructive Evaluation on Tension Shearing Strength with Fractal dimension and Neural Network)In refereedAcademic JournalCo-authorTAKUMA Masanori;SHINKE/NoboruNondestructive Evaluation;Neural Network;Fractal;Ultrasonic Inspection;Nondestractive Inspection;Welded Joint;Tension Shearing Load;Scanning GraphTransactions of the Japan Society of Mechanical Engineers(Series A)64/621,13751998/5/25~The Japan Society of Mechanical EngineeringThe nondestructive inspection of the welded region is very important for quality control.
The purpose of this study is to develop a methodology for nondestructive evaluation of the function of the spot-welded joint. In the previous paper, the system that consist of an ultrasonic inspection device and neural network was proposed to evaluate the tension-shearing load. The welded region's geometry in resistance spot welding of a two-plate joint was inspected by parallel scanning over the region by ultrasonic inspection.
The neural network learned the pattern sets dealing with the interaction between the scanning graphs and the tension-shearing load of spot-welded joints. The validity of the previous system was confirmed by comparing the output of the network with the experimental results. However, it had been serious problems for improving the accuracy of the tension-shearing load that the learning efficiency of the network was not good and the internal structure of the network were involved (the number of the input layer's units was 2401units), In this paper, fractal dimension is introduced to characterize the scanning graphs, and the application of the dimension is proposed as the input data of the neural network. The following became clear after the investigation: (1)The scanning graphs showed fractal characteristics. (2)The number of the input layer's units was reduced from 2401 to 98. (3)The accuracy of the evaluation and the learning efficiency of this network were much better than the previous network.
Research reportNondestructive Evaluation of Damage and Conditions for Low Cycle Fatigue -Application of Magnetomechanical Acoustic Emission and Magnetic Properties-UnrefereedIn-house publicationCo-authorTAKUMA Masanori;SHINKE/Noboru;YUKIMOTO/MituhiroMagnetic Properties;Nondestructive Evaluation;Fatigue Conditions;Fatigue Damage;Low Cycle FatigueEngineering & Technology11/3,11997/11/20~It is very important to detect the remaining life and the stress history of the structure's member parts with non-destructive inspection, when we evaluate the fatigue damage of the parts. In this paper, the low-cycle fatigue testing of carbon steel S45C was done. And the relationships between the behavior of MAE and the magnetic characteristic by the microscopic structural change of the material were examined. By observing the relationships, the method for evaluating the degree of fatigue damage (N/Nf) and the fatigue conditions (stress amplitude a and stress ratio R) was proposed. The following things became clear after the results of exam. (1)Each parameter (i.e. AE counting, average phenomenon energy, maximum amplitude voltage) of MAE reaches the peak by rapidly increasing in the initial stage of the fatigue damage. And the parameter decreases to minimum degree at the fatigue damage 0.25. (2)The behavior on each parameter of MAE signals is different by the fatigue condition of stress amplitude and stress ratio. (3)The saturation magnetic flux density shows the tendency which decreases with the increase in fatigue damage. (4)Though in case of the completely reversed tension and compression, the behavior of saturation magnetic flux density with degree of fatigue damage is different by the stress amplitude, and it is not different in the pulsating tension. (5)The neural network that learned the characteristic of magnetic and MAE signal could estimate the degree of fatigue damage and fatigue condition.
Academic presentationEvaluation on Fracture Characteristic of TiN Film Using Acoustic EmissionUnrefereedAcademic JournalCo-authorTAKUMA Masanori;YOSHIDA/Hideaki;SHINKE/Noboru;YONEKURA/Akira;KAWAI/SeikiFracture Properties;Film;Acoustic Emission Method1997 National Conference on Acoustic Emission/11,191997/11/6~The Japanese Society for Non-destructive InspectionIt is reported that the fracture characteristics of TiN film that coated on the SUS substrate are evaluated by using the AE event count and the fractal dimension m theory led from the amplitude detected in scratch testing (normal load is continuously taken).
PapersEvaluation of Function of Spot-Welded Joint Using Ultrasonic Inspection (Nondestructive Evaluation on Tension Shearing Strength with Neural Network)In refereedAcademic JournalCo-authorTAKUMA Masanori;SHINKE/Noboru;MOTONO/HitoshiUltrasonic Inspection;Tension Shearing Load;Scanning Graph;Nondestructive Evaluation;Neural Network;Welded Joint;Nondestrudtive InspectionJSME International Journal(Series A)39/4,6261996/10/15~The Japan Society of Mechanical EngineeringThe resistance welded joint is widely used as a structural part. Therefore, it is desirable to establish the nondestructive inspection method for quantitatively estimation the quality of the joint. In this paper, the system based on a neural network was proposed to estimate the tension-shearing load of spot-welded regions from their ultrasonic scanning graphs. The following became clear after the investigation: (1)this system, trained on many sets of experimental data, was able to produce good results from various scanning graphs, and (2)it was proven that this method of processing the information of the welded site is valid as a means of evaluation the tension shearing load of spot-welded joints.
PapersNondestructive Evaluation of Fatigue Damage and Conditions Using Magnetomechanical Acoustic Emission and Magnetic Properties(Report 1)-Application of Neural Network for Low Cycle Fatigue-In refereedAcademic JournalCo-authorTAKUMA Masanori;SHINKE/Noboru;YUKIMOTO/MituhiroCarbon Steel;Magnetic Properties;Acoustic Emission;Material Evaluation;Fatigue Testing;Material Testing;Nondestractive InspectionJournal of the Japan Society for Non-destructive Inspection45/4,2761996/4/1~The Japanese Society for Non-destructive InspectionIt is very important to evaluate damage levels of structures for prediction of fatigue fracture. The purpose of this study is to develop a methodology for evaluating fatigue damage and conditions by a nondestructive inspection technique. Low cycle fatigue tests were conducted in a 0.45% carbon steel under various fatigue conditions. During the tests, magnetomechanical acoustic emission and magnetic properties were measured at the predetermined number of cycles. The test results exhibited 256 pattern sets which describe the relationship between the measured parameters and the fatigue information such as damage level (Cycle ratio N/Nf), stress amplitude (a) and stress ratio (R). A nondestructive evaluation system consisting of a measuring apparatus and a neural network is proposed.
The effectiveness of this system is demonstrated by comparing neural network results with the experimental data obtained from the fatigue tests.
PapersEvaluation of Function of Spot-Welded Joint Using Ultrasonic Inspection(1st Report,Nondestructive Evaluation on Tension Shearing Strength with Neural Network)In refereedAcademic JournalCo-authorTAKUMA Masanori;SHINKE/Noboru;MOTONO/HitoshiTension Shearing Load;Scanning Graph;Nondestructive Evaluation;Neural Network;Ultrasonic Inspection;Nondestructive Inspection;Welded JointJSME,Series A62/595,7761996/3/25~The Japan Society of Mechanical EngineeringThe spot-welded joint is widely used as a structural part. Therefore, The nondestructive inspection of the welded region is very important for quality control. In this study, by parallel scanning over the welded region by ultrasonic inspection with a point-focused probe, its geometry in resistance spot welding of a two-plate joint was inspected. As a result of the inspection, the periphery of the spot weld was identified by the sharp minimum pattern in the scanning graphs of a sound spot weld. When the spot weld included a shrinkage cavity or blow hole in the wielded region, different patterns appeared in scanning graphs, so that the tension shearing load determined by testing was also different in the case of these patterns. Therefore, it is probable that the information for evaluating the load is included in the scanning graph obtained by ultrasonic inspection. Our aim is to develop a methodology for nondestructive evaluation of the function of the spot-welded joint. The present study is an attempt to construct an evaluation system for tension shearing load of the joint. The system consists of an ultrasonic inspection device and neural network. The network learned the pattern sets dealing with the interaction between the scanning graphs and the tension-shearing load of spot-welded joints. The output from the system was examined by comparing it with the experimental results and the validity of the system was confirmed.
Academic presentationEvaluation of Spot Welded Joints with Magnetomechanical Acoustic EmissionUnrefereedAcademic JournalCo-authorEvaluation;Spot Welded;Magnetomechanical Acoustic EmissionThe Japanese Soc. for Non-Destructive Inspection Spring Convention/,2671996/3/25~The Japanese Society for Non-destructive InspectionThe welded material is used for the component of various products. Therefore, it is desired to evaluate the function (for example, shearing strength and tensile strength, etc.) and control the quality of the material with non-destructive inspection. In this study, AE wave (MAE: Magnetomechanical Acoustic Emission) detected in the process which magnetizes weld zone of the spot welding joint was measured, and the relationship between the welded area and the tensile-shear load was examined. Then, the result of examining whether it could apply MAE as a non-destructive examination of spot welding member is reported.
Research reportEvaluation of Thermal Shock Damage for TIN-Coated Film by Acoustic Emission.-Relation Between Acoustic Emission and Image Data-UnrefereedIn-house publicationCo-authorTAKUMA Masanori;SHINKE/Noboru;OGURA/YuoukiTheomal Shock;Film;Acoustic Emission;Image DataEngineering Technology of Kansai Univ./86,81996/2/25~It is desired to quantitatively evaluate the heat-resistance of the coating materials with hard anoxic oxidation film. Then, thermal shock fatigue test by a YAG laser was carried out for TiN film made on SUS304 substrate by ion plating in this study. As a result of examining the relationship between AE and the film's image data, the following things became clear. (1) Between AE detected under test and image information (i.e. area proportion and lattice point number) which characterizes damage state of a film, there was the fixed relation regardless of the difference between laser irradiation conditions (i.e. the irradiation energy) in this experiment. (2) By formulating the relationship between detected AE and image information of part of damage, the possibility of quantitatively evaluating the damage state of a film from AE detected under test was able to be shown.
PapersStudy on Support System for Materials Selection in the Design Process(2nd Report,Application of Neural Network and Information Integration Method)In refereedAcademic JournalCo-authorTAKUMA Masanori;SHINKE/NoboruInformation Integration Method;Neural Network;Material Selection;Function;CAD;Production System;DesignJSME,Series C62/593,3971996/1/25~The Japan Society for Precision EngineeringIn recent years, production systems such as CAD have been proposed, which have exceptional information on design. This research is to develop a methodology for materials selection in the design process. In the previous paper, a consultation system was proposed to select the suitable materials. The system consisted of a neural network which has learned the patter dealing with the interaction between the function of products and materials. Knowledge from literature and the designers' experience in materials selection were incorporated into the pattern information. However, the system was stiff in that it led only to the selective order of the 40 kinds of materials which were stationed at the output layer of the neural network. The aim of present study is to construct a system with flexibility. This system consists of a neural network and an information integration method.
The former learns the pattern sets dealing with the interaction between the function of products and ingredients of material. The letter draws the order of priority of suitable materials from the ingredients of material which are evaluated by the neural network. The output from the system was examined by comparing it with the knowledge from literature and designer, and the validity of the system was confirmed.
Academic presentationNondestructive Evaluation of Low Cycle Fatigue Damage Using Magneto Mechanical Acoustic EmissionUnrefereedAcademic JournalCo-authorTAKUMA Masanori;SHINKE/Noboru;YUKIMOTO/MituhiroLow Cycle Ftique;Magnetomechanical Acoustic Emission;Neural Network;Evaluation of Damage1995 National Conference on Acoustic Emission/10,731995/11/9~The Japanese Society for Non-destructive InspectionIt is very important to detect the degree of fatigue damage and the fatigue condition of the member subject with no-destructive inspection, when forecast and design technique of the fatigue breakdown for the structure are improved. In this study, low-cycle fatigue testing (i.e. pulsating tension and completely reversed tension and compression) of carbon steel S45C for mechanical structure was carried out, and information on magnetic characteristic and magnetism AE was collected. The system applying the neural network that evaluate the degree of fatigue damage (cycle ratio) and fatigue condition (stress amplitude and stress ratio) was constructed and the validity of the output of the system was reported.
Academic presentationEvaluation of Thermal Shock Fracture of TiN Film Using Acoustic Emission -Relationship Between AE and Image Data of Film-UnrefereedAcademic JournalCo-authorTAKUMA Masanori;SHINKE/Noboru;OGURA/YuuikiImage Data;Thermal Shock;Film;Acoustic Emission1995 National Conference on Acoustic Emission/10,1151995/11/9~The Japanese Society for Non-destructive InspectionThe material which raised the heat-resistance by coating on the surface of the metallic material with hard anoxic oxidation coatings, has been used under the severe use environment in the high temperature. From such fact, it is desired that the evaluation method for quantitatively grasping thermal shock resistance of a film formed on the surface is established. In this study, thermal shock fatigue test by a YAG laser was carried out at TiN film made on SUS304 substrate by ion plating in this study. As a result of examining the relationship between AE detected at this time and image information which characterizes damage state of a film, it was proven that the damage state of a film could be quantitatively evaluated from the AE signal.
PapersA Study on Tool Management System in Turning (2nd Report) - Tool Selection with Neural Network and Information Integration Method -In refereedAcademic JournalCo-authorTAKUMA Masanori;SHIBASAKA/Toshiro;YAMAMOTO/Akio;TESHIMA/ToshioInformation Integration Method;Neural Network;Tool Selection;Tool ManagementJournal of the Japan Society for Procision Engineering61/5,7721995/5/5~The Japan Society for Precision EngineeringIn order to improve machining efficiency, it is necessary at each cutting process to select the optimum tool. Therefore, the importance of tool management which considers the features of each cutting tool has been recognized. In the 1st report, a structural model based on a neural network was proposed to estimate the rest of tool life time, and it is one of the most important information on the management. In this paper, the tool management system is proposed to select the most appropriate from a collection of cutting tools. This system consists of a data base block, estimation block and tool selection block. The data base block is in charge of the information (e.g. tool geometry, rest of tool life, measurement value such as cutting force) on tool selection. The estimation block is composed of the three neural network for estimating the information at the early turning, latter turning or life time under the given machining conditions. The tool selection block decides the order of selection with the information integration method. The following became clear after the investigation: (1)The estimated information by the networks agreed approximately with the experimental results. (2)The appropriate on the order of tool selection with this method was recognized by comparing the measure of information led from this system with the experiments.
Academic presentationEvaluation on Fracture Strength of TiN Film Using Acoustic EmissionUnrefereedOtherCo-authorEvaluation;Fracture Strength;TiN Film;Acoustic EmissionThe 72th Usual General Meeting Lecture Proceedings()/,6401995/3/31~Japan Society of Mechanical Engineers
Academic presentationStudy on Support System of Material Selection in Design ProcessUnrefereedOtherCo-authorSupport System;Material Selection;Design ProcessThe 72th usual General Meeting Lecture Proceedings()/,5541995/3/29~Japan Society of Mechanical Engineers
Academic presentationA Study on Evaluation for Function of Weldment Using Ultrasonic Testing - Nondestructive Evaluation of Spot Welding Zone with Neural Network -UnrefereedOtherCo-authorSpot Welding;Neural Network;Evaluation;Function;Weldment;Ultrasonic InspectionThe Japan Soc. for Non-Destructive Inspection Spring Convention Lecture Outline Collection in 1995/,2211995/3/27~Japanese Society for Non-destructive Inspection
Academic presentationNondestructive Evaluation of Fatigue Damage Using Magnetomechanical Acoustic Emission
- Application of Neural Network -UnrefereedOtherCo-authorEvaluation;Neural Network;Fatigue Damage;Magnetmechanical Acoustic EmissionThe Japanese Soc. for Non-Destructive Inspection Spring Convention Lecture Outline Collection in 1995/,2271995/3/27~Japan Society for Non-destructive Inspection
PapersOn the System for Setting the Cutting Conditions Based on the Evaluation of Cutting State (2nd Report) - Improvement of Searching Efficiency Using Neural Network -In refereedAcademic JournalCo-authorTAKUMA Masanori;SHIBASAKA/Toshiro;KAWAI/Masaki;TESHIMA/ToshioTurning;Neural Network;Hill-climbing Meghod;Fuzzy Integral;Searching Efficiency;Cutting ConditionsJournal of the Japan Society for Procision Engineering61/2,2181995/2/5~The Japan Society for Precision EngineeringThe skilled machinist can continuously adjust operation in terms of machining efficiency, merchantability and cost. This adjustment is done by means of cutting conditions. In the previous paper, the system was proposed to simulate the machinist's thinking process which set the appropriate cutting conditions based on evaluation of cutting state. The process was constructed by fuzzy integral and hill-climbing. But it had become a serious problem that the try counts on searching of the appropriate cutting conditions using the previous system were nearly four times as many as the skilled machinist's. In this paper, it proposed that the skilled machinist's know-how for improvement of searching efficiency is systematized by neural network. This system which is constructed by introducing the neural network into the previous system is superior to the previous system. By using this system, the cutting conditions which can get the high evaluation is obtained, and the try counts was half as many as the counts using the previous system. The accuracy of the system's output and the improvement of searching efficiency were examined by the experiments under various cutting conditions in turning, and the validity of this system was confirmed.
PapersA Study on Monitoring of Cutting Process (2nd Report) - Application of Fuzzy Integral Model Using Neural Network -In refereedAcademic JournalCo-authorTAKUMA Masanori;SHIBASAKA/Toshiro;KITAZAWA/Masaki;TESHIMA/ToshioMeasure of Information;Neural Network;Fuzzy Integral;Cutting State;MonitoringJournal of the Japan Society for Procision Engineering60/7,10141994/7/5~The Japan Society for Precision EngineeringThe skilled machinists evaluate exactly the cutting state. Therefore, the study on the modeling machinist's thinking process is progressed recently. In this paper, a rational way for the system monitoring the cutting state in turning is discussed. The proposed system consists of the fuzzy integral model which evaluates the individual cutting trouble (e.g. tool life, chatter, chip controllability) and the neural network which applies to the model depending on machining conditions. The fuzzy integral information that compared the evaluation of machinist with fuzzy integral model. The validity of this system was confirmed by the experiments under various cutting conditions in this study.
PapersStudy on Support System for Materials Selection in the Design Process (1st Report, Application of Neural Network)In refereedAcademic JournalCo-authorTAKUMA Masanori;SHIBASAKA/Toshiro;TESHIMA/Toshio;IWAI/Toshiro;HONDA/TomomiFunction;Materials Selection;CAD;Materials Selection;Design;Neural NetworkJapan Society of Mechanical Engineers60/574,21841994/6/25~Japan Society of Mechanical EngineersDesign is the process of translating an idea or a market need into detailed information from which a product can be made. Each of its stages requires decisions about the materials of which the product is to be made. The number of materials available to a designer is vast under these circumstances, and he must select from this vast menu the material best suited to his task. Thus it requires considerable intellectual effort to choose the material suitable for a certain purpose. In recent years greater cooperation with the designer has been proposed. For example, production system such as CAD have exceptional information of design. Our aim is to develop a methodology for materials selection in the design process. The present study is an attempt to build a consultation system for the selection of suitable materials. The system consists of a neural network which has learned the pattern sets dealing with the interaction between the function of products and materials. Knowledge from literature and the skilled machinists' knowledge on materials selection are incorporated into the pattern information. The output from the system was examined by comparing it with the technical knowledge from literature and designer, and the validity of the system was confirmed.
PapersA Study on Tool Menagement System in Turning (1st Report) - Estimation of Cutting Tool Life by Processing Image Data with Neural Network -In refereedAcademic JournalCo-authorTAKUMA Masanori;SHIBASAKA/Toshiro;KAWAI/Masaki;TESHIMA/ToshioNeural Network;Image Processing;Tool Wear;Tool Life;Tool ManagementJournal of the Japan Society for Procision Engineering60/5,7231994/5/5~The Japan Society for Precision EngineeringIn advanced manufacturing, it is necessary for the improvement of machining efficiency to select an optimum tool at each cutting process by tool management. Then, one of the most important issues is to estimate the rest of cutting tool life under a given cutting condition as accurately as possible. In this paper, a structural model based on neural network is proposed to estimate the life and the wear type of cutting tools from their image data and cutting conditions. The input of the model is (1)the states of crater wear and flank wear to cutting tool (e.g. grade of brightness caused by surface roughness, profile), obtained as image data, and (2)the cutting conditions. This system consists of the model based on neural network and image processing device. The output of the system was examined by the experiments under various cutting conditions in turning and the validity of the system was confirmed.
PapersOn the System for Setting the Cutting Conditions Based on the Evaluation of Cutting State (1st Report) - Application of Fuzzy Integral and Hill-Climbing -In refereedAcademic JournalCo-authorTAKUMA Masanori;SHIBASAKA/Toshiro;KAWAI/Masaki;TESHIMA/ToshioHill-climbing Method;Searching;Fuzzy Integral;Machining Efficiency;Chatter;Cutting ConditionsJournal of the Japan Society for Procision Engineering.60/2,2551994/2/5~The Japan Society for Precision EngineeringCutting conditions have an effect on machining efficiency, machining cost and machining time. Thus, a multitude of methods have been proposed to determine the optimum cutting conditions. But each in itself is specific and has limited applicability to the situation for which it was devised. Hence, it may be said that the cutting conditions which are led from those methods are only sub-conditions in the machining scene. On the other hand, the skilled machinist can continuously adjust operations in terms of machining efficiency, merchantability and cost. This adjustment is done by means of cutting conditions.
In this paper, the system is proposed to simulate the machinist's thinking process which set the appropriate cutting conditions based on evaluation of cutting state. The thinking process is constructed by fuzzy integral and hill-climbing. The accuracy of the system's output was examined by the experiments under various cutting conditions in turning, and the validity of the system was confirmed.
Academic presentationCo-author1993/10/10~
PapersEstimation of Cutting Tool Life by Processing Tool Image Data with Neural NetworkIn refereedAcademic JournalCo-authorTAKUMA Masanori;TESHIMA/Toshio;SHIBASAKA/ToshiroEvaluation;Tool Life;Image Data;Neural NetworkCIRP ANNALS 1993 Manufacturing Technology42/1,591993/8/22~CIRP Manufacturing TechnologyIn the manufacturing system such as FMS, one of the most important issues is to estimate the rest of cutting tool life under given cutting conditions as accurately as possible.
In this paper, a system based on neural network is proposed to estimate the life and wear type of cutting tools from their image data and cutting conditions. The input of the system is (1)the states of a cutting tool, crater wear and flank wear, obtained as image data, and (2)the cutting conditions. The validity of the system was confirmed by the examinations under various cutting conditions in turning.
Academic presentationOn the Study for Setting the Cutting Conditions Based on the Evaluation of Cutting StateUnrefereedOtherCo-authorCutting Condition;Evaluation;Gutting StateThe Japan Soc. of Precision Engineering Spring Convention Scientific Lecture Association Lecture Proceedings in 1993/,1891993/3/26~The Japan Society for Precision Engineering
Academic presentationCo-author1993/3/26~
Academic presentationA Study on Tool Management in Turning
- Prediction of Tool Information by Neural Network -UnrefereedOtherCo-authorTool Information;Neural Network;Tool ManagementThe Japan Soc. of Mechanical Engineers Hokuriku Branch 30th General Meeting Lecture Proceedings937/1, 2971993/3/18~Japan Society of Mechanical Engineers
Academic presentationA Study on Monitoring of Cutting Process
- Recognition of Cutting Process by Processing State of Chip Ejection with Neural Network -UnrefereedOtherCo-authorRecognition;Neural Network;Chip Ejection;Monitoring;Cutting ProcessThe Japan Soc. of Mechanical Engineers Hokuriku Branch 30th General Meeting Lecture Proceedings937/1,3011993/3/18~Japan Society of Mechanical Engineers
Academic presentationA Study on Consulting System for Design
- Application of Fuzzy Theory and Neural Network -UnrefereedOtherCo-authorNeural Network;Fuzzy Theory;Consulting System;Design ProcessThe Japan Soc. of Mechanical Engineers Hokuriku Branch 30th General Meeting Lecture Proceedings937/1,3291993/3/18~Japan Society of Mechanical Engineers
Academic presentationA Study on Setting of Cutting Conditions - Decision of Cutting Speed by Neural Network -UnrefereedOtherCo-authorCutting Conditions;Decision;Cutting Speed;Neural NetworkThe Japan Soc. of Mechanical Engineers Hokuriku Branch 30th General Meeting Lecture Proceedings937/1,3051993/3/18~Japan Society of Mechanical Engineers
Academic presentationCo-author1993/3/18~
PapersOn the System for Setting of the Cutting Conditions Based on the Evaluation of Cutting State - Case of the Situations Tending Chatter -In refereedAcademic JournalCo-authorTAKUMA Masanori;TESHIMA/Toshio;SHIBASAKA/Toshiro;KAWAI/MasakiHill-climbing Method;Fuzzy Intergral;Chatter;Cutting ConditionsInternational Journal of the Japan Society for Precision Engineering26/4,3541992/12/31~The Japan Society for Precision EngineeringA multitude of methods have been proposed to determine the optimum cutting conditions. But each in itself is specific and has limited applicability to the situation for which it was devised. Hence, it may be said that the cutting conditions which are led from those methods are only sub-conditions in the machining scene. On the other hand, the skilled machinist can continuously adjust operations in terms of machining efficiency, merchantability and cost. This adjustment is done by means of cutting conditions. A purpose of this study is to realize the system into which is introduced the skilled machinist's know-how.
Academic presentationA Study on a Support System for Materials Selection in the Design ProcessUnrefereedOtherCo-authorSupport System;Materials Selection;Desiogn ProcessThe Japan Design Engineering Association Hokuriku Branch 1992 Research Presentation Proceeding/,291992/6/27~The Japan Design Engineering Association
PapersA Study on Monitoring of Cutting Process (1st Report) - Evaluation of Tool changing Time Using Fuzzy Model -In refereedAcademic JournalCo-authorTAKUMA Masanori;TESHIMA/Toshio;SHIBASAKA/Toshiro;KITAZAWA/MasakiIn-process Measurement;Machinist's Subjective Characteristics;Fuzzy Integral;Tool Changing TimeJournal of the Japan Society for Precision Engineering58/6,9931992/6/5~The Japan Society for Precision EngineeringThe skilled machinists evaluate exactly the tool changing time from observational information in cutting process. Such machining know-how gained through long experience may be regarded in a sense as fuzzy object. Recently, the study on the model representation of this know-how are progressed for making use of automatic working. In this paper, a rational way for the constructed model of evaluating the tool changing time is discussed. The proposed model gives the value of sharpness grade by weighing the observational information of fuzzy measure which the machinist's subjective characteristics in grading the tool changing time are identified. From the applications of model using fuzzy integral it was found that the output of the model agreed approximately with the machinist's evaluation, and that the model became a vary useful method for the monitoring by the in-process measurement.
PapersA Study on the System for Setting the Cutting Conditions with the Model of Machinist's Thinking WayIn refereedAcademic JournalCo-authorTAKUMA Masanori;TESHIMA/Toshio;SHIBASAKA/Toshiro;KAWAI/Masaki;YAMAOTO/AkioMachinist;Fuzzy Inference;Neural Network;knowledge-base SystemAdvanced Production Technology/11,451992/4~Advanced Production TechnologyThis paper is an attempt to construct a system of setting of the cutting conditions. Primary purpose of this study was constructing a knowledge-base system. This system determines the cutting conditions from modeling machinist's thinking process. The procedures are as follows. (1)A machinist's function of the information processing, which estimates machinability, is possible to be systematized by the neural network. Hence, poor machinability can be recognized from the learned neural network. (2)Machinist's subjective knowledge, which correct the cutting conditions to restrain the poor machinability, can be expressed by the fuzzy production rules. Therefore, the correction value of cutting conditions can be inferred from the composition of fuzzy production rules. (3) It was found from the experiments that fitted cutting conditions was obtained by the constructed system.
PapersOn the Improvement of Working Accuracy by Fuzzy ControlIn refereedAcademic JournalCo-authorTAKUMA Masanori;YANO/Akishige;HIGUCHI/MasahiroModel Representation;Working Accuracy;Machinist's Houristic Rules;Fuzzy Control;Learning SystemJournal of the Japan Society for Procision Engineering57/7,12811991/7/5~The Japan Society for Precision EngineeringThe skilled machinists carry out a very important role in the advanced manufacturing.
Recently, the importance of the machining know-how has been recognized for the development in automatic working. Such heuristic rules gained through long experience may be regarded in a sense as fuzzy object. In this paper, a rational way for the acquisition of and model representation of the machinist's heuristic rules in turning operation is discussed. The main results of experiments are summarized as follows: (1)Using fuzzy logic, the machinist's heuristic rules for control to the dimensional error in diameter of cylindrical workplace under machining were transformed into fuzzy control rules. (2)Fuzzy controller could be constructed with 16 heuristic control rules. (3)In case of cutting test with the present fuzzy control system, every machining accuracy obtained was within the tolerance specified.
PapersAcquisition and Model Representation of Machining Know-how Using Fuzzy AlgorithmsIn refereedAcademic JournalCo-authorTAKUMA Masanori;YANO/Akishige;HIGUCHI/MasahiroFuzzy Partial Order Relation;Fuzzy Integral;Structural Model;Machining Know-howJournal of the Japan Society for Precision Engineering55/7,12111989/7/5~The Japan Society for Precision EngineeringSkilled machinists can predict intuitively trouble in workplace for cutting by glancing at the machine part drawing. Such machining know-how gained through long experience may be regarded in a sense as the fuzzy object. In this paper, a rational way for the acquisition of and model representation of this know-how is discussed. The following became clear after the investigation: (1)Through an analysis of the fuzzy partial order relation among machine part drawing, the attributes of the machine part which show a tendency to develop cutting trouble were clarified. (2)By identifying machinist subjectivity with the fuzzy measure, the know-how of the trouble prediction could be represented by a structural model using the fuzzy integral.
PapersGrading Sharpness of Grinding Wheel Using Fuzzy Integral - Study on the Grinding Sound (4th Report) -In refereedAcademic JournalCo-authorTAKUMA Masanori;HIGUCHI/Masahiro;YANO/Akishige;AKAO/HidekiMachinist's Subjective Characteristic;Fuggy Integral;Loudness;Sharpness Evalution;Grinding WheelJournal of the Japan Society for Precision Engineering54/4,7611988/4/5~The Japan Society for Precision EngineeringThe skilled machinists evaluated precisely the sharpness of cutting edges by weighing the perceived grinding sound on their scales acquired through the experiences. The purpose of the present paper is to make a suggestion regarding the sharpness evaluation by the model using the fuzzy integral. The constructed model gives the values of sharpness grade by weighing the loudness of the various bands of frequencies on the fuzzy measure which the machinist's subjective characteristics in grading the redress life are identified. From verifying results of the model, it was found that the outputs of the model agreed approximately with the machinist's evaluations and the model became a vary useful method for in-process measurement.
PapersDecision Support System for Turning Conditions based on Threshold Logic and Fuzzy InferenceIn refereedAcademic JournalCo-authorTAKUMA Masanori;HIGUCHI/Masahiro;YANO/AkishigeFuggy Inference;Threshold Logic;Experience Rule;Decision Support System;MachinabilityJapan Society of Mechanical Engineers53/490,12691987/6/25~The Japan Society of Mechanical EngineeringThe present study is an attempt to build a consulting system for decision-making about turning conditions. Our primary was with building a system which attached a great importance to the subjective knowledge of the human experts rather than placing emphasis on objectiveness based on numerical information. The procedures used area as follows. (1)Because the memories of the experts deeply versed in the question of macinability are perfectly possible to be systematized by the threshold logic, the reasonable turning conditions can be derived from the logic. (2)The experience rules of the experts for dissolving the poor merchantability can be expressed by the fuzzy relation. Therefore, the cause can be inferred by using an inverse operation of the composition of the fussy relation, and same pertinent suggestions can be made.
Research reportCo-author1987~
One's own expense publishing bookA Study on the Manufacturing Software with Fuzzy TheoryIn refereedMonographSingle-AuthorTAKUMA MasanoriManufacturing Software;Fuzzy Theory1986/10/1~1990It is making use of the knowledge of the skilled person for machine processing. But, it is very difficult to make their skill a figure. Skill is because it is formed by a qualitative expression. Fuzzy theory is suitable for solving such a problem. So, building of the production processing software which fuzzy theory was used for was tried by this research. By the collation with the experimental result, it was possible to clarify that the morph is possible in the fuzzy theory in respect of the knowledge on the skill.
Academic presentationUnrefereedOtherCo-authorTAKUMA,Masanori
Academic presentationUnrefereedOtherTAKUMA,Masanori;;;;;
Research Activities Overseas
- Kansai University's Overseas Research Program(long term)Apr. 1996-Mar. 0,The Unites States of America University of California, Los Angeles (U.C.L.A)
Participation in International Conferences
- CIRP (International Institution for Production Engineering Research) Aug.1993-Aug. 1993
- International Acoustic Emission Conference Aug.1998-Aug. 1998
- The 17th International Acoustic Emission Symposium Nov.9,2004-Nov. 12,2004
- The17th International Acoustic Emission Nov.9,2004-Nov. 12,2004
- The 18th International Acoustic Emission Symposium(Progress in Acoustic Emission XIII) 2006
- ROGRESS IN ACOUSTIC EMISSION XIV Dec.9,2008-Dec. 12,2008
Courses Taught
- Experiments of Fundamental Mechanical Engineering
- Solid Mechanics
- Thesis Projects I
- Thesis Projects II
- Preliminary Thesis Project
- Elementary Physics/Experiments for Mechanical Engineering
- Strength of Materials I
- Strength of Materials II
- Overview of Industrial Technology
- Special Lecture in Mechanical Engineering
- Advanced Materials Evaluation
- SeminarI(Mechanical Engineering)
- SeminarII(Mechanical Engineering)
- SeminarIII(Mechanical Engineering)
- SeminarIV(Mechanical Engineering)
- Personal Information
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- Research Activities
- Community Service
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