伊藤 大輔イトウ ダイスケ |
|---|
所属学部・学科等
- 社会安全学部 安全マネジメント学科
職名 (資格)
- 教授 2022年 4月 1日
出身学校・専攻
- 名古屋大学 工学部機械・航空工学科 2004年 卒業
- 名古屋大学 工学部2004年
- 名古屋大学 工学研究科2009年
- 名古屋大学 工学研究科2006年
- 名古屋大学 工学研究科2012年
出身大学院・研究科
- 名古屋大学修士課程 工学研究科機械理工学専攻 2006年 修了
- 名古屋大学博士課程 工学研究科機械理工学専攻 2009年 単位取得満期退学
取得学位
- 博士（工学） 2012年 4月 名古屋大学
- 博士（工学）
ホームページ・メール
- ホームページアドレス：https://wps.itc.kansai-u.ac.jp/dito/
- メールアドレス：dito@kansai-u.ac.jp
研究業績
| No. | 研究業績の種類 | 発表年月日 | 標題 | 出版物の種類 | 共著・単著の別 | 出版社・掲載誌 | 巻・号・頁 |
|---|---|---|---|---|---|---|---|
| 1 | 論文1 | 2022年2022,00,00,,, | 体調検知・事故回避技術利用による疾病患者の運転に対する一般市民の社会受容性調査 | 学術雑誌 | 国内共著 | 日本交通科学学会誌 | 21(2) |
| 2 | 論文1 | 2020年12月 1日2020,12,01,,, | Analysis of car driver responses to avoid car-to-cyclist perpendicular collisions based on drive recorder data and driving simulator experiments | 学術雑誌 | 国際共著 | Accident Analysis & Prevention | Volume 150, February 2021, 105862 |
| 3 | 論文1 | 2020年11月 16日2020,11,16,,, | Maxillofacial Injuries in Cyclists: A Biomechanical Approach for the Analysis of Mechanisms of Mandible Fractures. | 学術雑誌 | 国内共著 | Journal of Oral and Maxillofacial Surgery | Volume 79, Issue 4, Pages 871-879 |
| 4 | 論文1 | 2020年6月 2020,06,00,,, | A preliminary FE analysis of a helmeted head in an A-pillar impact: effects of whole-body kinematic behavior of cyclist and head-helmet interaction on brain strain | 学術雑誌 | 共著 | International Journal of Crashworthiness | |
| 5 | 論文1 | 2019年9月 18日2019,09,18,,, | Age-related injury risk curves for the lumbar spine for use in low-back-pain prevention in manual handling tasks | 学術雑誌 | 国内共著 | ROBOMECH Journal | 6, 12 |
| 6 | 学会発表7 | 2019年6月 20日2019,06,20,,, | 高齢歩⾏者衝突時の肋骨骨折発生メカニズムの検討 | 第55回日本交通科学学会学術講演会 | |||
| 7 | 学会発表7 | 2019年6月 20日2019,06,20,,, | ドライビングシミュレータによる四輪車対自転車の出会い頭事故再現 | 第55回日本交通科学学会学術講演会 | |||
| 8 | 学会発表7 | 2019年6月 20日2019,06,20,,, | 肋骨皮質骨厚さ分布を考慮した前突時自動車乗員の胸部傷害解析 | 国内共著 | 第55回日本交通科学学会学術講演会 | ||
| 9 | 論文1 | 2019年5月 2019,05,00,,, | Aピラー衝突時の自転車用ヘルメットによる脳傷害軽減メカニズムの検討 | 自動車技術会論文集 | 50,3,838-843- | ||
| 10 | 論文1 | 2019年1月 2日2019,01,02,,, | AEB effectiveness evaluation based on car-to-cyclist accident reconstructions using video of drive recorder | TRAFFIC INJURY PREVENTION | 20,1,100-106- | ||
| 11 | 学会発表7 | 2018年12月 14日2018,12,14,,, | 自動車事故時における日本人高齢者モデルを用いた傷害再現 | 国内共著 | 日本機械学会第31回バイオエンジニアリング講演会 | ||
| 12 | 学会発表7 | 2018年10月 2018,10,00,,, | 四輪車端部衝突時における歩行者・自転車乗員挙動と傷害比較 | 自動車技術会学術講演会 | |||
| 13 | 論文1 | 2018年10月 2018,10,00,,, | Validation of crush energy calculation methods for use in accident reconstructions by finite element analysis | SAE International Journal of Transportation Safety | 6,2,133-146- | ||
| 14 | 学会発表7 | 2018年8月 27日2018,08,27,,, | 大腿骨へのスクリュー挿入による頸部骨折予防効果の検証 | 日本実験力学会2018年度年次講演会 | |||
| 15 | 論文1 | 2018年8月 1日2018,08,01,,, | Difference between car-to-cyclist crash and near crash in a perpendicular crash configuration based on driving recorder analysis | 国際共著 | Accident Analysis and Prevention | 117,,1-9 | |
| 16 | 国際学会8 | 2018年7月 25日2018,07,25,,, | Development of liver finite element models with vessel structures applied to car crash analyses | ICRASH Conference 2018 | |||
| 17 | 学会発表7 | 2018年6月 16日2018,06,16,,, | ラット落下実験時の胸部応答に対する胸郭粘弾性特性の影響 | 日本バイオレオロジー学会誌(Web) | 32,2,94 (WEB ONLY)-94 | ||
| 18 | 学会発表7 | 2018年5月 23日2018,05,23,,, | ドライブレコーダ映像を用いた事故再現による衝突被害軽減ブレーキの効果評価 | 自動車技術会学術講演会 | |||
| 19 | 学会発表7 | 2018年5月 23日2018,05,23,,, | Aピラー衝突時の自転車用ヘルメットによる脳傷害軽減メカニズムの検討 | 自動車技術会学術講演会 | |||
| 20 | 学会発表7 | 2018年5月 23日2018,05,23,,, | 自動車事故再現のための車体変形エネルギー計算方法の検討 | 国内共著 | 自動車技術会学術講演会 | ||
| 21 | 学会発表7 | 2017年12月 14日2017,12,14,,, | 様々な衝突形態における拘束装置作動タ イミングの乗員傷害への影響 | 第30回バイオエンジニアリング講演会 | |||
| 22 | 学会発表7 | 2017年12月 14日2017,12,14,,, | 前面衝突解析による下肢傷害発生メカニ ズムに関する研究 | 第30回バイオエンジニアリング講演会 | |||
| 23 | 学会発表7 | 2017年12月 14日2017,12,14,,, | Aピラー衝突における自転車用ヘルメッ トによる脳傷害軽減の検討 | 国内共著 | 第30回バイオエンジニアリング講演会 | ||
| 24 | 学会発表7 | 2017年9月 4日2017,09,04,,, | 自転車用ヘルメットによる脳傷害軽減に関す る基礎検討 | 日本機械学会2017年度年次大会 | |||
| 25 | 論文1 | 2017年7月 25日2017,07,25,,, | 血管を考慮した肝臓有限要素モデルの衝突解析への適用 | 自動車技術会論文集 | 48,4,1-6- | ||
| 26 | 学会発表7 | 2017年6月 1日2017,06,01,,, | ドライブレコーダによる自転車事故と歩行者事故の分析 | 第53回日本交通科学学会総会・学術講演会 | |||
| 27 | 学会発表7 | 2017年6月 1日2017,06,01,,, | 血管構造を考慮した肝臓を有する人体有限要素モデルの側面衝突解析への適用 | 第53回日本交通科学学会総会・学術講演会 | |||
| 28 | 学会発表7 | 2017年5月 24日2017,05,24,,, | Comparison of Real Accident and Near Miss Incident of Cyclist Collisions Based on Drive Recorder | 国際共著 | 自動車技術会学術講演会 | ||
| 29 | 論文1 | 2017年3月 20日2017,03,20,,, | Proposal of a calculation method to determine the structural components' contribution on the deceleration of a passenger compartment based on the energy-derivative method | Traffic Injury Prevention | 18,sup1,S79-S84- | ||
| 30 | 学会発表7 | 2017年3月 14日2017,03,14,,, | Biomechanical effect on lumbar spine model after pedicle-lengthening osteotomy | 東海支部第66期総会・講演会 | |||
| 31 | 学会発表7 | 2017年1月 19日2017,01,19,,, | 歩行者保護技術の死亡率に基づく効果評価法の有効性 の検討 | 第29回バイオエンジニアリング講演会 | |||
| 32 | 学会発表7 | 2017年1月 19日2017,01,19,,, | 大腿骨近位部骨折防止におけるヒッププロテクタの性能評価 | 第29回バイオエンジニアリング講演会 | |||
| 33 | 学会発表7 | 2017年1月 19日2017,01,19,,, | ブレーキを伴う前面衝突における体格差の乗員傷害へ の影響 | 国内共著 | 第29回バイオエンジニアリング講演会 | ||
| 34 | 学会発表7 | 2017年1月 19日2017,01,19,,, | 血流を考慮した肝臓損傷解析モデルの衝突解析への適用 | 第29回バイオエンジニアリング講演会 | |||
| 35 | 論文1 | 2017年2017,00,00,,, | Head protection with cyclist helmet in impact against vehicle A-pillar | 国際共著 | INTERNATIONAL JOURNAL OF CRASHWORTHINESS | 22,3,322-331 | |
| 36 | 国際学会8 | 2016年11月 24日2016,11,24,,, | Effects of crash pulse on kinematic behavior and injury outcome in frontal impact considering pre-impact braking | 2016 The International Forum of Automotive Traffic Safety (INFATS) | |||
| 37 | 国際学会8 | 2016年11月 24日2016,11,24,,, | Devising a method to calculate the trajectory of a dummy's head using linear acceleration and angular velocity | 国内共著 | 2016 The International Forum of Automotive Traffic Safety (INFATS) | ||
| 38 | 論文1 | 2016年11月 2016,11,00,,, | ダミーの頭部加速度と角速度による頭部軌跡の計算方法 | 自動車技術会論文集 | 47,6,1399-1404- | ||
| 39 | 学会発表7 | 2016年10月 19日2016,10,19,,, | 高減速度車両の前面衝突における乗員の胸たわみ発生要因と低減方法の検討 | 自動車技術会学術講演会 | |||
| 40 | 学会発表7 | 2016年10月 19日2016,10,19,,, | 衝突被害軽減ブレーキによる歩行者の頭部保護効果の検証 | 自動車技術会学術講演会 | |||
| 41 | 論文1 | 2016年10月 17日2016,10,17,,, | 衝突被害軽減ブレーキによる歩行者の頭部保護効果の検証 | 自動車技術会大会学術講演会講演予稿集(CD-ROM) | 2016,,ROMBUNNO.242- | ||
| 42 | 学会発表7 | 2016年9月 22日2016,09,22,,, | 自動車部材のエネルギー吸収特性に基づく衝突速度の算出手法 | 第29回計算力学講演会 | |||
| 43 | 学会発表7 | 2016年9月 22日2016,09,22,,, | 血流を考慮した肝臓の損傷解析モデルの構築 | 第29回計算力学講演会 | |||
| 44 | 論文1 | 2016年8月 5日2016,08,05,,, | Comparison of chest injury measures of hybrid III dummy | International Journal of Crashworthiness | 22,1,38-48- | ||
| 45 | 学会発表7 | 2016年5月 25日2016,05,25,,, | ダミーの頭部加速度と角速度による頭部軌跡の計算方法 | 自動車技術会学術講演会 | |||
| 46 | 学会発表7 | 2016年5月 25日2016,05,25,,, | 愛知県における歩行者および自動車乗員の交通事故の分析 | 自動車技術会学術講演会 | |||
| 47 | 国際学会8 | 2016年5月 16日2016,05,16,,, | The Influence of Cyclist Lower Extremity Postures and Bicycle Velocity in Vehicle Collisions | 国際共著 | 2016 IRCOBI Asia Conference | ||
| 48 | 国際学会8 | 2016年5月 16日2016,05,16,,, | Finite Element Analysis for Understanding Trauma Brain Injury in Judo | 2016 IRCOBI Asia Conference | |||
| 49 | 学会発表7 | 2016年3月 17日2016,03,17,,, | 有人ロケットの緊急脱出時における鉛直上向きの人体の荷重伝達の検討 | 日本機械学会東海支部第 65 期総会・講演会 | |||
| 50 | 論文1 | 2016年3月 2016,03,00,,, | 自動車衝突時の下肢姿勢違いにおける自転車乗員の挙動と傷害への影響 | 自動車技術会論文集 | 47,2,485-490- | ||
| 51 | 学会発表7 | 2016年1月 9日2016,01,09,,, | 高減速度の車両の前面衝突における乗員の胸たわみの発生要因と低減方法の検討 | 国内共著 | 第28回日本機械学会バイオエンジニアリング講演会 | ||
| 52 | 論文1 | 2016年1月 6日2016,01,06,,, | JTDBを用いた歩行者，自転車乗員の傷害発生に関する分析 | 日本交通科学学会誌 | 15,2,36-49- | ||
| 53 | 論文1 | 2016年1月 2016,01,00,,, | 車の衝突時の客室回転による乗員挙動への影響 | 自動車技術会論文集 | 47,1,171-176- | ||
| 54 | 論文1 | 2016年2016,00,00,,, | The influence of lower extremity postures on kinematics and injuries of cyclists in vehicle side collisions | TRAFFIC INJURY PREVENTION | 17,6,618-624 | ||
| 55 | 学会発表7 | 2015年10月 14日2015,10,14,,, | 自動車衝突時の下肢姿勢違いにおける自転車乗員の挙動・傷害への影響 | 自動車技術会学術講演会 | |||
| 56 | 論文1 | 2015年7月 2015,07,00,,, | 自動車前面衝突における乗員の胸部傷害指標の検討 | 自動車技術会論文集 | 46,4,793-798- | ||
| 57 | 学会発表7 | 2015年5月 20日2015,05,20,,, | 車の衝突時の客室回転による乗員挙動への影響 | 国際共著 | 自動車技術会学術講演会 | ||
| 58 | 論文1 | 2015年5月 2015,05,00,,, | 自動車衝突時における自転車乗員の挙動・傷害の有限要素解析 | 自動車技術会論文集 | 46,3,639-644- | ||
| 59 | 論文1 | 2015年4月 2015,04,00,,, | Crash Pulse Optimization for Occupant Protection at Various Impact Velocities | TRAFFIC INJURY PREVENTION | 16,3,260-267 | ||
| 60 | 論文1 | 2015年3月 25日2015,03,25,,, | Aピラー衝突における自転車ヘルメットによる頭部保護 | 自動車技術会論文集 | 46,2,1-8- | ||
| 61 | 論文1 | 2015年1月 31日2015,01,31,,, | ラット落下実験による胸部応答評価と人体有限要素モデルとの比較 | 日本交通科学学会誌 | 14,2,15-21- | ||
| 62 | 学会発表7 | 2015年1月 9日2015,01,09,,, | Aピラー衝突時における自転車乗員用ヘルメットの衝撃保護性能の研究 | 第27回日本機械学会バイオエンジニアリング講演会 | |||
| 63 | 学会発表7 | 2015年1月 9日2015,01,09,,, | 自動車前面衝突における拘束装置による乗員の胸部変形 | 第27回日本機械学会バイオエンジニアリング講演会 | |||
| 64 | 学会発表7 | 2015年1月 9日2015,01,09,,, | 足関節有限要素モデルの構築と交通事故外傷への適用 | 第27回日本機械学会バイオエンジニアリング講演会 | |||
| 65 | 論文1 | 2014年12月 2014,12,00,,, | Adult headform impact tests of three Japanese child bicycle helmets into a vehicle | ACCIDENT ANALYSIS AND PREVENTION | 73,,359-372 | ||
| 66 | 論文1 | 2014年5月 2014,05,00,,, | Bumper contact sensor for pedestrian collisions based on analysis of pedestrian kinematic behaviour | International Journal of Crashworthiness | 19,5,514-523- | ||
| 67 | 学会発表7 | 2014年3月 18日2014,03,18,,, | 自動車の前面衝突における車両減速度の最適化 | 国内共著 | 日本機械学会東海支部第63期講演会 | ||
| 68 | 学会発表7 | 2014年1月 11日2014,01,11,,, | 自転車乗員ヘルメットの衝撃保護性能の研究 | 第26回日本機械学会バイオエンジニアリング講演会 | |||
| 69 | 論文1 | 2014年1月 2014,01,00,,, | Optimization of Vehicle Deceleration to Reduce Occupant Injury Risks in Frontal Impact | TRAFFIC INJURY PREVENTION | 15,1,48-55 | ||
| 70 | 学会発表7 | 2013年10月 23日2013,10,23,,, | 遺伝的アルゴリズムを用いた乗員保護のための車両減速度の最適化 | 自動車技術会学術講演会 | |||
| 71 | 国際学会8 | 2013年9月 11日2013,09,11,,, | An Inverse Finite Element Approach for Estimating the Fiber Orientations in Intercostal Muscles | IRCOBI (International Research Council on Biomechanics of Injury) Conference 2013 | |||
| 72 | 国際学会8 | 2013年9月 11日2013,09,11,,, | Occupant kinematic behavior and effects of a motorized seatbelt on occupant restraint of human volunteers during low speed frontal impact: mini-sled tests with mass production car seat. | IRCOBI (International Research Council on Biomechanics of Injury) Conference 2013 | |||
| 73 | 国際学会8 | 2013年9月 11日2013,09,11,,, | Hyper-viscoelastic Response of Perfused Liver under Dynamic Compression and Estimation of Tissue Strain Thresholds with a Liver Finite Element Model | 国内共著 | IRCOBI (International Research Council on Biomechanics of Injury) Conference 2013 | ||
| 74 | 国際学会8 | 2013年5月 27日2013,05,27,,, | Assessment of a pre-crash seatbelt technology in frontal impacts by using a new crash test sled system with controllable pre-impact braking | 国内共著 | 23rd International Technical Conference on the Enhanced-Safety of Vehicles | ||
| 75 | 論文1 | 2013年1月 2013,01,00,,, | ブレーキ制動を伴う衝撃実験におけるモータライズドシートベルトの乗員保護効果に関する検討 | 自動車技術会論文集 | 44,1,137-142- | ||
| 76 | 論文1 | 2012年3月 13日2012,03,13,,, | Evaluation of mechanical propertiesof skeletal muscle with strain injury | Journal of Biomechanical Science and Engineering | 7,2,156-167- | ||
| 77 | 論文1 | 2011年1月 2011,01,00,,, | プリクラッシュ時における筋応答による姿勢維持の効果に関する研究 | 自動車技術会論文集 | 42,1,55-60- | ||
| 78 | 論文1 | 2010年1月 2010,01,00,,, | A novel constitutive model of skeletal muscle taking into account anisotropic damage | JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS | 3,1,85-93 | ||
| 79 | 国際学会8 | 2004年7月 4日2004,07,04,,, | Pathological change in muscle contusion with direct impact loading | 国内共著 | The 14th European Society of Biomechanics Conference |
論文体調検知・事故回避技術利用による疾病患者の運転に対する一般市民の社会受容性調査査読有学術雑誌国内共著伊藤大輔;國行浩史日本交通科学学会誌21(2)2022年本論文では体調検知・事故回避技術普及による疾病患者の運転への社会受容性や体調検知・危険回避技術があったにも関わらず発生する事故に対する市民意識について一般市民に対するインターネットアンケート調査をおこなった．調査の仮説として，過去に自身もしくは知人が運転中に体調変化があった場合に体調検知・危険回避技術に対して肯定的になると考え，過去の体調変化の経験との関係について分析をおこなった．対象は50歳以上の男女とし，回答件数は1500件である．結果として，現段階での自動車交通社会に対する認知として，急な体調変化を適切に検知し，危険回避が可能な装置が普及しても体調急変の可能性がある疾病患者の運転が社会的に受容されない可能性が示唆された．一方，自身または知人の運転中の体調変化の経験が体調検知技術への期待を高め，体調検知技術による疾病患者の運転への許容に正の影響を与えることが示された．また，一般市民の認識として，体調計測機器を付けることを条件として運転を許可されている人がそれを付け忘れた場合，運転手の責任が大きくなると考える人が全体の半数を超えており，体調変化検知を自動的に開始するなどの仕組みが必要と考える．以上より，安全運転を支援するシステムの開発と並行して，それが社会に許容される必要があり，今後社会受容性向上のための施策について検討する必要がある．
論文Analysis of car driver responses to avoid car-to-cyclist perpendicular collisions based on drive recorder data and driving simulator experiments査読有学術雑誌国際共著Yuqing Zhao, Teruki Miyaharaa, Koji Mizuno, Daisuke Ito, Yong HanAccident Analysis & PreventionVolume 150, February 2021, 1058622020年12月 1日https://doi.org/10.1016/j.aap.2020.105862The reduction of cyclist injuries and fatalities is one of the important issues in traffic safety. To establish countermeasures to avoid collisions, it is necessary to understand driver’s responses in such critical situations. From videos of drive recorders, the behavior of cyclists and drivers that led to car-to-cyclist collisions can be analyzed objectively. In this research, the drivers’ responses to avoid car-to-cyclist perpendicular collisions were examined using videos of drive recorders, and through using a driving simulator.
First, drivers’ responses to avoid collisions were compared between near-miss incidents and actual collisions using videos from drive recorders. In a statistical analysis of selected parameters of the drivers’ responses, the average values of different parameters such as the time-to-collision (TTC), the deceleration at the time the cyclist was first visible to the driver, and the braking reaction time (BRT) were significantly different between near-miss incidents and collisions. Applying logistic regression to the near-miss and collision data revealed that the BRT at the time the cyclist was first visible had the largest influence on collision occurrences. The velocity-TTC, and the velocity-distance graphs at the time of braking-onset was plotted; the car deceleration of 5.2 m/s2 was the threshold which discriminated near-miss and collisions.
Second, the responses of people to avoid collisions against cyclists were investigated in a driving simulator. Based on real-world collision videos from the drive recorders, two scenarios were reconstructed where the crossing cyclist appeared suddenly from behind view-blocking obstructions at an intersection. Scenario A has a relatively large TTC of 1.9 s, and scenario B had a small TTC of 0.5 s. The BRT was significantly smaller in the group that avoided collisions than in the group that collisions occurred in scenario A, whereas all parameters (TTC, BRT, and car deceleration) were all significantly smaller in the group that avoided collision in scenario B.
The driver response parameters (TTC, BRT and car deceleration) were comparable between the drive recorder data and the driving simulator experiments. It was demonstrated that the BRT is the most important parameter toward avoiding collisions. Some drivers who accelerated the cars at the intersections had large BRT, and this led to collisions. Additionally, it was observed that swerving of cars without braking was not effective for collision avoidance.
論文Maxillofacial Injuries in Cyclists: A Biomechanical Approach for the Analysis of Mechanisms of Mandible Fractures.査読有学術雑誌国内共著Yasuhiko Tsutsumi, Daisuke Ito, Mami Nakamura, Shinya Koshinuma, Gaku Yamamoto, Masahito HitosugiJournal of Oral and Maxillofacial SurgeryVolume 79, Issue 4, Pages 871-8792020年11月 16日10.1016/j.joms.2020.11.005Purpose: The investigators characterized the occurrence of maxillofacial injuries in cyclists and biomechanically analyzed the mechanisms of mandible fractures.
Methods: We retrospectively analyzed injury data and performed biomechanical analyses with finite element models. Hospital records from 2011 through 2019 were reviewed to identify patients who had sustained oral and maxillofacial injuries while riding a bicycle. Patients with maxillofacial fractures were compared to those without. Logistic regression analysis was performed to identify which variables were independently associated with the occurrence of maxillofacial fractures. To reconstruct the injury scenario (one in which a person falls from a bicycle and contacts the road surface with their face), computer simulations using The Total Human Model for Safety model were performed.
Results: The hospital records of 94 patients (62 men, 32 women; 26.1 ± 17.3 years of age) who sustained oral and maxillofacial injuries while riding a bicycle were reviewed. Twenty patients (21.3%) sustained maxillofacial fractures; mandible fractures were most common (16 patients). Patients with maxillofacial fractures were significantly older and had higher severity injuries; however, logistic regression analysis showed that only age was an independent predictor of the occurrence of maxillofacial fracture (odds ratio, 1.03; P = .025). In simulations, higher von Mises stresses were found in the mandible when the cyclist fell with the neck extended and the body horizontal, and consequently, the center of mandibular body strikes the road surface. Contact forces were approximately 8 kN. High tensile stresses occurred laterally and high compressive stresses occurred medially in the mandibular ramus, which indicated that the mandibular ramus deformed in the transverse plane.
Conclusion: Biomechanical analyses show that mandible fractures can occur when a cyclist falls from a bicycle and their lower face strikes the road's surface.
論文A preliminary FE analysis of a helmeted head in an A-pillar impact: effects of whole-body kinematic behavior of cyclist and head-helmet interaction on brain strain査読有学術雑誌共著ITO,Daisuke;SUGIURA, Kotaro;MIZUNO, KojiInternational Journal of Crashworthiness2020年6月 10.1080/13588265.2020.1779995The purpose of this study is to examine the rotational mechanisms of a helmeted head and the effects of whole-body kinematic behavior of a cyclist and head-helmet interaction on head rotation and brain strain in an A-pillar impact in a car-to-cyclist collision. FE simulations where helmeted and unhelmeted cyclist models configured to collide with a small sedan car model were conducted. Although the number of impact simulations was limited, rapid head rotational motion and high brain strain were observed despite wearing a helmet model due to bottoming out of the helmet liner. In contrast, a low-friction helmet could reduce the change of head angular velocity and brain strain due to a significant reduction of a moment of force. In addition, the head rotation before impact generated relatively high brain strain, which indicated importance of whole-body kinematic behavior to discuss brain deformation in car-to-cyclist collisions.
論文Age-related injury risk curves for the lumbar spine for use in low-back-pain prevention in manual handling tasks査読有学術雑誌国内共著Kudo N, Yamada Y, Ito DROBOMECH Journal6, 122019年9月 18日https://doi.org/10.1186/s40648-019-0139-9This study introduces injury risk curves for the lumbar spine for use in the risk assessment of low back pain (LBP) caused by manual lifting of heavy loads. LBP has been a longstanding problem among industrial workers, giving rise to the development of assistive devices. However, quantitative evaluation methods to verify the safety of such devices have not yet been established. The notable biomechanical criterion of 3.4 kN of lumbar compressive force, defined by the National Institute for Occupational Safety and Health, applies only to young, healthy workers with a fixed risk level. This study on injury risk curves clarified the risk level of injury to the lumbar spine due to lumbar compressive force for individuals within a wide age range. The findings can be applied for the design and evaluation of assistive devices as well as the design of ergonomic guidelines for manual work.
学会発表高齢歩⾏者衝突時の肋骨骨折発生メカニズムの検討伊藤大輔, 嶋倉悠介, 水野幸治第55回日本交通科学学会学術講演会2019年6月 20日八王子市学園都市センター
学会発表ドライビングシミュレータによる四輪車対自転車の出会い頭事故再現宮原輝貴, 趙雨晴, 孔春玉, 伊藤大輔, 青木宏文, 水野幸治第55回日本交通科学学会学術講演会2019年6月 20日八王子市学園都市センター
学会発表肋骨皮質骨厚さ分布を考慮した前突時自動車乗員の胸部傷害解析国内共著安部英和, 伊藤大輔, 水野幸治第55回日本交通科学学会学術講演会2019年6月 20日八王子市学園都市センター
論文Aピラー衝突時の自転車用ヘルメットによる脳傷害軽減メカニズムの検討査読有伊藤大輔, 野場悠佑, 水野幸治自動車技術会論文集50,3,838-843-2019年5月 10.11351/jsaeronbun.50.8381883-0811Aピラー衝突時の自転車用ヘルメットによる脳傷害軽減メカニズムについて有限要素解析により検討した．ヘルメットを着用した人体モデルを自転車に着座させ，車両と衝突させたところ，多くの場合でヘルメットにより脳ひずみが軽減したが，脳傷害発生リスクが軽減されない場合もあった．その原因を力学的観点から分析した．
論文AEB effectiveness evaluation based on car-to-cyclist accident reconstructions using video of drive recorderZhao Yuqing, Ito Daisuke, Mizuno KojiTRAFFIC INJURY PREVENTION20,1,100-106-2019年1月 2日10.1080/15389588.2018.15332471538-9588
学会発表自動車事故時における日本人高齢者モデルを用いた傷害再現国内共著嶋倉悠介, 水野幸治, 伊藤大輔, 一杉正仁日本機械学会第31回バイオエンジニアリング講演会2018年12月 14日郡山市立中央公民館
学会発表四輪車端部衝突時における歩行者・自転車乗員挙動と傷害比較白井陽久, 水野幸治, 伊藤大輔, 中根大祐, 田中良知自動車技術会学術講演会2018年10月 名古屋国際会議場
論文Validation of crush energy calculation methods for use in accident reconstructions by finite element analysis査読有Shusuke Numata, Koji Mizuno, Daisuke Ito, Dai Okumura, Hisashi KinoshitaSAE International Journal of Transportation Safety6,2,133-146-2018年10月 10.4271/09-06-02-00092327-5634The crush energy is a key parameter to determine the delta-V in accident reconstructions. Since an accurate car crush profile can be obtained from 3D scanners, this research aims at validating the methods currently used in calculating crush energy from a crush profile. For this validation, a finite element (FE) car model was analyzed using various types of impact conditions to investigate the theory of energy-based accident reconstruction.
Two methods exist to calculate the crush energy: the work based on the barrier force and the work based on force calculated by the vehicle acceleration times the vehicle mass. We show that the crush energy calculated from the barrier force was substantially larger than the internal energy calculated from the FE model. Whereas the crush energy calculated from the vehicle acceleration was comparable to the internal energy of the FE model.
In full frontal impact simulations, the energy of approach factor (EAF) has a linear relation with the residual crush, which had been validated in previous experimental studies. In our study using FE analysis, we found that the slope of EAF versus the residual crush was comparable with that of the dynamic crush en
Two methods exist to calculate the crush energy: the work based on the barrier force and the work based on force calculated by the vehicle acceleration times the vehicle mass. We show that the crush energy calculated from the barrier force was substantially larger than the internal energy calculated from the FE model. Whereas the crush energy calculated from the vehicle acceleration was comparable to the internal energy of the FE model.
In full frontal impact simulations, the energy of approach factor (EAF) has a linear relation with the residual crush, which had been validated in previous experimental studies. In our study using FE analysis, we found that the slope of EAF versus the residual crush was comparable with that of the dynamic crush en
学会発表大腿骨へのスクリュー挿入による頸部骨折予防効果の検証鈴木剛志, 水野幸治, 伊藤大輔, 原田敦, 根本哲也日本実験力学会2018年度年次講演会2018年8月 27日山梨大学
論文Difference between car-to-cyclist crash and near crash in a perpendicular crash configuration based on driving recorder analysis査読有国際共著Daisuke Ito, Kosei Hayakawa, Yuma Kondo, Koji Mizuno, Robert Thomson, Giulio Bianchi Piccinini, Naruyuki HosokawaAccident Analysis and Prevention117,,1-92018年8月 1日10.1016/j.aap.2018.03.0290001-4575Analyzing a crash using driving recorder data makes it possible to objectively examine factors contributing to the occurrence of the crash. In this study, car-to-cyclist crashes and near crashes recorded on cars equipped with advanced driving recorders were compared with each other in order to examine the factors that differentiate near crashes from crashes, as well as identify the causes of the crashes. Focusing on cases where the car and cyclist approached each other perpendicularly, the differences in the car's and cyclist's parameters such as velocity, distance and avoidance behavior were analyzed. The results show that car-to-cyclist crashes would not be avoidable when the car approaching the cyclist enters an area where the average deceleration required to stop the car is more than 0.45 G (4.4 m/s2). In order for this situation to occur, there are two types of cyclist crash scenarios. In the first scenario, the delay in the drivers’ reaction in activating the brakes is the main factor responsible for the crash. In this scenario, time-to-collision when the cyclist first appears in the video is more than 2.0 s. In the second scenario, the sudden appearance of a cyclist from behind an obstacle on the street is the factor responsible for the crash. In this case, the time-to-collision is less than 1.2 s, and the crash cannot be avoided even if the driver exhibited avoidance maneuvers.
国際学会Development of liver finite element models with vessel structures applied to car crash analysesDaisuke Ito, Yuichi Uchida, Koji MizunoICRASH Conference 20182018年7月 25日西安市血管構造を有する肝臓有限要素モデルの開発とそれを組み込んだ人体モデルの衝突解析への適用
学会発表ラット落下実験時の胸部応答に対する胸郭粘弾性特性の影響伊藤大輔, 一杉正仁日本バイオレオロジー学会誌(Web)32,2,94 (WEB ONLY)-942018年6月 16日2186-5663
学会発表ドライブレコーダ映像を用いた事故再現による衝突被害軽減ブレーキの効果評価趙雨晴, 三久保瑛, 水野幸治, 伊藤大輔, 近藤由麻, 細川成之自動車技術会学術講演会2018年5月 23日パシフィコ横浜
学会発表Aピラー衝突時の自転車用ヘルメットによる脳傷害軽減メカニズムの検討伊藤大輔, 野場悠佑, 水野幸治自動車技術会学術講演会2018年5月 23日パシフィコ横浜
学会発表自動車事故再現のための車体変形エネルギー計算方法の検討国内共著沼田修佑, 水野幸治, 伊藤大輔, 細川成之, 田中良和自動車技術会学術講演会2018年5月 23日パシフィコ横浜
学会発表様々な衝突形態における拘束装置作動タ イミングの乗員傷害への影響佐野拓也, 伊藤大輔, 水野幸治第30回バイオエンジニアリング講演会2017年12月 14日京都大学
学会発表前面衝突解析による下肢傷害発生メカニ ズムに関する研究家入保真, 水野幸治, 伊藤大輔第30回バイオエンジニアリング講演会2017年12月 14日京都大学
学会発表Aピラー衝突における自転車用ヘルメッ トによる脳傷害軽減の検討国内共著野場悠佑, 伊藤大輔, 水野幸治第30回バイオエンジニアリング講演会2017年12月 14日京都大学
学会発表自転車用ヘルメットによる脳傷害軽減に関す る基礎検討伊藤大輔, Cheam Zi Jian, 水野幸治日本機械学会2017年度年次大会2017年9月 4日埼玉大学
論文血管を考慮した肝臓有限要素モデルの衝突解析への適用査読有内田祐一, 伊藤大輔, 水野幸治自動車技術会論文集48,4,1-6-2017年7月 25日In car accidents, components and restraint systems around the occupant can cause severe injuries to the abdomen area. Damage to the liver, the largest internal organ, can result in large amounts of bleeding, leading to fatal injuries. In this study, a liver model with internal blood vessels was developed and validated by dynamic compression ex vivo. Then, impact tests were conducted on a full-body human finite element model containing the liver. Finally, a side impact collision was simulated with the human model seated in the car, and liver deformation as well as internal injury caused by the blood were investigated.
学会発表ドライブレコーダによる自転車事故と歩行者事故の分析近藤由麻, 水野幸治, 伊藤大輔, 細川成之第53回日本交通科学学会総会・学術講演会2017年6月 1日ピアザ淡海
学会発表血管構造を考慮した肝臓を有する人体有限要素モデルの側面衝突解析への適用伊藤大輔, 内田祐一, 水野幸治第53回日本交通科学学会総会・学術講演会2017年6月 1日ピアザ淡海
学会発表Comparison of Real Accident and Near Miss Incident of Cyclist Collisions Based on Drive Recorder国際共著Koji Mizuno, Kosei Hayakawa, Yuuma Kondo, Daisuke Ito, Robert Thomson, Giulio Bianchi Piccinini, Naruyuki Hosokawa自動車技術会学術講演会2017年5月 24日パシフィコ横浜
論文Proposal of a calculation method to determine the structural components' contribution on the deceleration of a passenger compartment based on the energy-derivative method査読有Kei Nagasaka, Koji Mizuno, Daisuke Ito, Naoya SaidaTraffic Injury Prevention18,sup1,S79-S84-2017年3月 20日10.1080/15389588.2017.12969571538-9588In car crashes, the passenger compartment deceleration significantly influences the occupant loading. In this study, a calculation method to determine the structural components' contribution on the car deceleration, called energy-derivative method, was proposed. Using this energy-derivative method, the contribution of each component on the passenger compartment deceleration can be determined. Using finite element car models, this method was applied for full-width and offset impact tests.
The sum of the contribution of each component coincides with the passenger compartment deceleration in all types of impacts; therefore, the validity of this method was confirmed. In the full-width impact, the contribution of the crush box was large in the initial phases, and the contribution of the passenger compartment was large in the final phases.
Based on the energy-derivative method, the contribution of the components' deformation to deceleration of the passenger compartment can be calculated for various types of crash configurations more easily, directly, and quantitatively than by using conventional methods.
The sum of the contribution of each component coincides with the passenger compartment deceleration in all types of impacts; therefore, the validity of this method was confirmed. In the full-width impact, the contribution of the crush box was large in the initial phases, and the contribution of the passenger compartment was large in the final phases.
Based on the energy-derivative method, the contribution of the components' deformation to deceleration of the passenger compartment can be calculated for various types of crash configurations more easily, directly, and quantitatively than by using conventional methods.
学会発表Biomechanical effect on lumbar spine model after pedicle-lengthening osteotomyLei Qian, Koji Mizuno, Daisuke Ito, Jun Ouyang東海支部第66期総会・講演会2017年3月 14日静岡大学Lumbar spinal stenosis is a common medical problem in elderly individuals and may lead to disabling neurogenic claudication. This study aimed to figure out the changes of kinematics and biomechanical effect on lumbar spine finite element (FE) model after pedicle-lengthening osteotomy by comparing them to the intact healthy male FE lumbar spine model.
A three-dimensional FE model of intact lumbar spine was constructed and the pedicle-lengthening osteotomy surgery was performed at L4 by using pedicle-lengthening screw.
The maximum change in stress of the intervertebral discs was -23.0% at L3 in flexion, -17.7% at L4 in extension, 6.5% at L5 in left bending, 13.5% at L5 in right bending, 13.4% at L4 in left rotation and 28.4% at L4 in right rotation.
学会発表歩行者保護技術の死亡率に基づく効果評価法の有効性 の検討長濱真梨恵, 伊藤大輔, 水野幸治, 高橋裕公, 柳岡寿幸第29回バイオエンジニアリング講演会2017年1月 19日ウインクあいち死亡率に基づく歩行者保護技術の効果評価方法の有用性を示した．本論文では車両剛性に限定し解析をおこなったが，本評価手法の妥当性検証と併せて，より実際に近い歩行者保護デバイスの評価の評価も今後おこなっていく．
学会発表大腿骨近位部骨折防止におけるヒッププロテクタの性能評価波多野亘, 水野幸治, 伊藤大輔第29回バイオエンジニアリング講演会2017年1月 19日ウインクあいち衝撃試験
プロテクタ装着により衝撃持続時間と変位量が増加し，骨頭荷重が
減少する
転倒時，地面に対する頸部軸角度の違いが荷重値に影響を及ぼす
学会発表ブレーキを伴う前面衝突における体格差の乗員傷害へ の影響国内共著木戸間健佑, 佐野拓也, 伊藤大輔, 水野幸治第29回バイオエンジニアリング講演会2017年1月 19日ウインクあいち自動車乗員保護のために，プリクラッシュセーフティ技術の開発が進められ，衝突前のブレーキによる乗員の姿勢変化が衝突後の乗員挙動に与える影響が注目されている．しかし，従来の検討では，あるひとつの乗員モデルについてプリクラッシュセーフティシステムの効果を確認するものが多く，乗員の体格差を考慮したものは少なかった．
本研究では，小柄体型女性モデルを用いて，衝突前のブレーキを考慮した2種類の前面衝突を再現し，男性乗員モデルとの比較を行うことで，乗員の体格差が衝突後の挙動に与える影響を調査した．
学会発表血流を考慮した肝臓損傷解析モデルの衝突解析への適用内田祐一, 伊藤大輔, 水野幸治第29回バイオエンジニアリング講演会2017年1月 19日ウインクあいち本研究では，門脈およびその内部の血液を再現した肝臓モデルを構築し，人体FEモデルを用いた側面衝突の有限要素解析を行い，運転席乗員の血流に起因した肝臓損傷について検討した．以下に結論を示す．
1. 腹部および胸部が客室と接触することで，肋骨および肋軟骨を通して肝臓が変形する．
2. アームレストと腹部の接触により，肝臓下部が大きく変形する．
3. 肝臓が圧縮されることにより，門脈入口付近に応力集中が発生する．
4. 衝突解析において，肝臓内部の損傷を正しく評価するには血流を再現したシミュレーションが有効である．
論文Head protection with cyclist helmet in impact against vehicle A-pillar査読有国際共著Koji Mizuno, Daisuke Ito, Keiji Oida, Goichi Kobayashi, Yong HanINTERNATIONAL JOURNAL OF CRASHWORTHINESS22,3,322-3312017年10.1080/13588265.2016.12599521358-8265In vehicle-cyclist collisions, the head of cyclists impacts frequently against the windshield and the A-pillar of the vehicle. Accident analyses show that the head injury risk is high in impacts with stiff A-pillars. In this research, the head protection with cyclist helmets in impacts against the A-pillar was investigated from experiments and finite element (FE) analyses. The headform impact tests were conducted using the pedestrian headform with and without a cyclist helmet. In the A-pillar impact at 35 km/h, the HIC reduced substantially from without helmet (4815) to with helmet (3000) though it was far above the injury acceptance level (1000). The head protection by helmets in impacts against A-pillars might be limited because of high impact velocities of the head and A-pillar stiffness. The FE simulations of the headform impacts indicated that the helmet liner deformed locally and bottomed-out in the A-pillar impacts, whereas the A-pillar deformation was small. In the FE analysis of a human head model with a capping helmet, the skull fracture did not occur but the brain strain was large. From a simple model of the head acceleration in the A-pillar impact, it was shown that the helmet liner has little effect on the HIC, whereas a deforming A-pillar with a force level of 5-7kN could reduce the HIC of the head with helmets less than 1500.
国際学会Effects of crash pulse on kinematic behavior and injury outcome in frontal impact considering pre-impact brakingDaisuke ITO, Takuya SANO, Kensuke KIDOMA, Koji MIZUNO2016 The International Forum of Automotive Traffic Safety (INFATS)2016年11月 24日The First World Hotel, Hangzhou, ChinaThe effects of the change in posture due to pre-impact braking on the kinematic behavior were investigated
by using FE analysis and a human FE model. The full-width frontal impact and small-overlap
frontal impact were selected as the crash pulse. Spinal flexion and rotation angles were evaluated by using the
Euler angle. The neck extension, which was observed in dummy tests, was relatively small in the human FE
model simulation because of the upper body twisting behavior caused by the human spine flexibility.
国際学会Devising a method to calculate the trajectory of a dummy's head using linear acceleration and angular velocity国内共著Yuichi UCHIDA, Koji MIZUNO, Daisuke ITO, Ryoichi YOSHIDA2016 The International Forum of Automotive Traffic Safety (INFATS)2016年11月 24日The First World Hotel, Hangzhou, ChinaThe method of calculating the head trajectory in three dimensions within the passenger compartment using the head and vehicle's acceleration and angular velocity in their respective local coordinate systems was constructed. To verify this calculation method, a crash simulation in LS-DYNA was conducted to compare the calculated and simulated result. Next, in order to demonstrate real-world usability of this method, the dummy's head trajectory was calculated using the linear acceleration and angular velocity of the dummy's head obtained from a sled test. The calculated result was then compared to the trajectory obtained from video analysis of the crash test. The possibility of obtaining the head trajectory in the global coordinate system from the local head's acceleration and angular velocity using LS-DYNA and MADYMO was also investigated. The head trajectory of a vehicle occupant with respect to the vehicle coordinate system and global coordinate system can be obtained using these methods.
論文ダミーの頭部加速度と角速度による頭部軌跡の計算方法査読有内田祐一, 陳一唯, 水野幸治, 伊藤大輔, 吉田良一自動車技術会論文集47,6,1399-1404-2016年11月 The method of calculating the head trajectory in three dimensions within the passenger compartment using the head and vehicle's acceleration and angular velocity in their respective local coordinate systems was constructed. To verify this calculation method, a crash simulation in LS-DYNA was conducted to compare the calculated result and the simulated result. The possibility of obtaining the head trajectory in the global coordinate system from the head and vehicle's acceleration and angular velocity in their respective local coordinate systems using LS-DYNA and MADYMO was also investigated. The head trajectory of a vehicle occupant with respect to the vehicle as well as the global coordinate system can be obtained using these methods.
学会発表高減速度車両の前面衝突における乗員の胸たわみ発生要因と低減方法の検討服部遥花, 根崎将吾, 伊藤大輔, 水野幸治自動車技術会学術講演会2016年10月 19日札幌コンベンションセンターChest injury of the occupant is usually severe upon experiencing high deceleration during a vehicle frontal crash, hence reduction of this chest injury is important for occupant protection. A finite element sled model was created to investigate the different methods to protect the occupant's chest during the high deceleration in a crash. The simulation obtained was compared to experiments to ensure consistency. The causes for chest deflection on the Hybrid III AM50 dummy was then investigated, followed by methods to reduce this injury.
学会発表衝突被害軽減ブレーキによる歩行者の頭部保護効果の検証シアー ルーベン, 水野幸治, 伊藤大輔, 一杉正仁自動車技術会学術講演会2016年10月 19日札幌コンベンションセンターThis paper describes the effects of using a current AEB system in real world accident scenarios, and identifies when AEB will increase the injury risk of a pedestrian in a collision even though impact speed was lower. The use of AEB in vehicles may cause vehicle and pedestrian kinematics to change from the original accidents, and in turn the pedestrian impact location on the car may change as well. As such, the pedestrian has a possibility of hitting a stiffer part of the vehicle, suffering a more serious injury. The injury parameters used in this paper to assess pedestrian injury are both impact speed and HIC.
論文衝突被害軽減ブレーキによる歩行者の頭部保護効果の検証SEAH Reuben, 水野幸治, 伊藤大輔, 一杉正仁自動車技術会大会学術講演会講演予稿集(CD-ROM)2016,,ROMBUNNO.242-2016年10月 17日2189-4558
学会発表自動車部材のエネルギー吸収特性に基づく衝突速度の算出手法黒田啓介, 伊藤大輔, 水野幸治第29回計算力学講演会2016年9月 22日名古屋大学東山キャンパス本研究においては車体の変形量を計測することによって，車体の変形エネルギを求め，車両の衝突速度を導出することを目的に行った．
学会発表血流を考慮した肝臓の損傷解析モデルの構築内田祐一, 伊藤大輔, 水野幸治第29回計算力学講演会2016年9月 22日名古屋大学東山キャンパス本研究では，血流を再現した肝臓モデルを構築し，肝臓モデル単体および人体FEモデルを用いた有限要素解析を行い，血流に起因した肝臓損傷について検討した．結論を以下に示す．
1. 肝臓モデル単体の動的圧縮解析において，血流に起因して門脈入口付近で応力集中が発生する．
2. 圧縮率に対する荷重応答は実質のみのモデルでも再現できる．
3. 人体内において，肝臓内部の損傷を正しく評価するには，血流を再現したシミュレーションが有効である．
論文Comparison of chest injury measures of hybrid III dummy査読有Koji Mizuno, Shogo Nezaki, Daisuke ItoInternational Journal of Crashworthiness22,1,38-48-2016年8月 5日10.1080/13588265.2016.12155871358-8265The chest deflection and chest acceleration (3 ms) have been used as chest injury measures of Hybrid III dummy in frontal crash tests. In this research, the relationship between two chest injury measures was investigated based on finite element analysis of Hybrid III in a frontal impact. The equation of motion of the chest was established using the external (seatbelt force and airbag contact force) and internal forces (neck, shoulder joint, lumbar spine force) that are exert on the chest. The chest deflection is related to the external forces, and the chest acceleration is related to the external and internal forces. The influence that the restraint conditions (seatbelt path and force limiter) has on the chest acceleration and chest deflection was also investigated. The seatbelt path affected the rib cage deformation mode and the chest sternum deflection, but it has little effect of on the chest acceleration. Lowering the seatbelt force limiter value also reduced the chest deflection substantially, but it did not show any clear relationship with the chest acceleration since the kinematics and the internal forces of the Hybrid III dummy changed with varying force limiter values.
学会発表ダミーの頭部加速度と角速度による頭部軌跡の計算方法内田祐一, 陳一唯, 水野幸治, 伊藤大輔, 吉田良一自動車技術会学術講演会2016年5月 25日パシフィコ横浜The method of calculating the head trajectory in three dimensions within the passenger compartment using the head and vehicle's acceleration and angular velocity in their respective local coordinate systems was constructed. To verify this calculation method, a crash simulation in LS-DYNA was conducted to compare the calculated result and the simulated result. The possibility of obtaining the head trajectory in the global coordinate system from the head and vehicle's acceleration and angular velocity in their respective local coordinate systems using LS-DYNA and MADYMO was also investigated. The head trajectory of a vehicle occupant with respect to the vehicle as well as the global coordinate system can be obtained using these methods.
学会発表愛知県における歩行者および自動車乗員の交通事故の分析早川航生, 水野幸治, 伊藤大輔自動車技術会学術講演会2016年5月 25日パシフィコ横浜愛知県の交通事故カルテに用いて自動車対歩行者および自動車対自転車の死亡事故について分析した．道路状況や法令違反の有無・種類によって事故を分類した．それにより道路の幅員の大きさが歩行者の事故に，交差点の見通しが自転車の事故に大きな影響を及ぼすことを明らかにした．
国際学会The Influence of Cyclist Lower Extremity Postures and Bicycle Velocity in Vehicle Collisions国際共著水野幸治, 伊藤大輔, 水口浩爾, 韓勇2016 IRCOBI Asia Conference2016年5月 16日Hongik University, Seoul, South KoreaIn a vehicle-cyclist collision, cyclist kinematics are comparable with that of a pedestrian, except that the cyclist exhibits a pelvis slide behavior on the hood top [1]. A cyclist will assume various cyclic postures of the lower extremities while pushing on the pedals in a rotary motion when pedaling. It is not clear whether these lower extremity postures and velocities of the cyclist affect kinematics and injuries. In this study, the influence of lower extremity posture on cyclist kinematics and injuries was investigated with and without bicycle velocity.
国際学会Finite Element Analysis for Understanding Trauma Brain Injury in Judo伊藤大輔, 水野幸治, 一杉正仁, 村山晴夫, 小山勝弘2016 IRCOBI Asia Conference2016年5月 16日Hongik University, Seoul, South KoreaIn this study, head impact conditions in judo were reproduced with a human FE model, and brain kinematics and injuries were examined in order to understand head injury mechanisms in judo. A head FE model reflecting anatomical and mechanical characteristics was used. Experimental data of translational and rotational acceleration were input to the FE model. The brain strain distribution and some injury measures were investigated.
学会発表有人ロケットの緊急脱出時における鉛直上向きの人体の荷重伝達の検討小林吾一, 水野幸治, 伊藤大輔日本機械学会東海支部第 65 期総会・講演会2016年3月 17日愛知工業大学有人宇宙飛行の緊急脱出を想定して，Hybrid III と人体FEモデルに鉛直上向き荷重，後面衝撃荷重を与えた．結果は以下の通りである．
(1)Hybrid III は鉛直上向きの荷重入力に対して，体幹が変形せず，腰部，胸部，頭部が同じ加速度を示し，人体応答を検討するモデルとしては適していない．
(2)人体有限要素モデルでは，胸部，腰部に続いて頭部が加速される．全身挙動は初期姿勢に依存する部分が大きく，アップライトの姿勢ではそのままの姿勢を保ちつつ，全身が上方に加速される．
論文自動車衝突時の下肢姿勢違いにおける自転車乗員の挙動と傷害への影響査読有水口 浩爾, 伊藤大輔, 水野幸治自動車技術会論文集47,2,485-490-2016年3月 A cyclist takes different postures of lower extremities while pushing the pedals. In this research, the kinematics of the whole body and injury risk of cyclist were examined for three representative postures of the lower extremities with and without cyclist traveling velocity. The knee height of the cyclist relative to the hood leading edge affected the kinematics and the head impact location against the car. The bicycle velocity influenced not only head impact location in the car lateral direction but also knee deformation.
学会発表高減速度の車両の前面衝突における乗員の胸たわみの発生要因と低減方法の検討国内共著根崎 将吾, 水野 幸治, 伊藤 大輔, 谷口 厚義, 波多野 明宏, 松下 和弘第28回日本機械学会バイオエンジニアリング講演会2016年1月 9日東京工業大学Occupant's chest injury is especially severe in the high deceleration vehicle frontal crash, therefore reduction of occupant's chest injury is needed for the occupant protection. In this research, a sled test under high deceleration crash pulse was reproduced to investigate the protection methods of occupant's chest under the high deceleration pulse. We validated the sled model by comparing with experimental result and examined the mechanism of chest deflection of Hybrid III dummy. It was showed that forward displacement of dummy's pelvis in high-deceleration sled model was larger than that in the small car model. This large forward displacement of pelvis caused larger inner shoulder belt force. It is needed to lower pelvis displacement to reduce dummy chest deflection.
論文JTDBを用いた歩行者，自転車乗員の傷害発生に関する分析査読有伊藤大輔, 水野幸治, 齋藤大蔵日本交通科学学会誌15,2,36-49-2016年1月 6日本研究では，日本外傷データバンクで収集された外傷データから日本の歩行者および自転車乗員の外傷の傾向を明らかにすることを目的とする．特に歩行者事故および自転車乗車中の事故で頻発する頭部および下肢の外傷発生状況を年齢層別，性別に解析し，その特徴について検討した．
歩行者および自転車乗車中の事故では頭部外傷の発生頻度が高いことは従来の事故統計と同様の結果であったのに対し，下肢傷害では，これまで自動車側での保護対策が十分におこなわれていない骨盤での損傷の発生頻度が高いことがわかった．自転車乗車中の事故では大腿骨骨折の占める割合が高くなり，事故状況の違いが受傷部位に影響を及ぼすことが示された．さらに，両事故形態ともに加齢に伴い出血性脳損傷の増加や大腿骨頚部での骨折割合の増加など，外傷の種類や発生箇所が変化することが明らかとなった．
歩行者および自転車乗車中の事故では頭部外傷の発生頻度が高いことは従来の事故統計と同様の結果であったのに対し，下肢傷害では，これまで自動車側での保護対策が十分におこなわれていない骨盤での損傷の発生頻度が高いことがわかった．自転車乗車中の事故では大腿骨骨折の占める割合が高くなり，事故状況の違いが受傷部位に影響を及ぼすことが示された．さらに，両事故形態ともに加齢に伴い出血性脳損傷の増加や大腿骨頚部での骨折割合の増加など，外傷の種類や発生箇所が変化することが明らかとなった．
論文車の衝突時の客室回転による乗員挙動への影響査読有陳 一唯, 水野幸治, 伊藤大輔, 細川 成之, 韓 勇自動車技術会論文集47,1,171-176-2016年1月 The objective of this study is to understand the effects of car rotation on occupant kinematic behavior in vehicle impact with rotation. The method to provide the boundary condition for the occupants under car acceleration and rotation was formulated. Small overlap frontal crash (yawing), full-width crash (pitching) and offset impact tests (yawing and pitching) were examined by FE model simulations. The vehicle yaw motions had a small effect on the occupant kinematics. The vehicle pitch motions mitigated the loading on occupants in a frontal crash since the anchor of the seatbelt moved with vehicle pitch rotation, which increased ridedown of the occupant.
論文The influence of lower extremity postures on kinematics and injuries of cyclists in vehicle side collisions査読有Koji Mizuno, Hidefumi Yamada, Hiroshi Mizuguchi, Daisuke Ito, Yong Han, Masahito HitosugiTRAFFIC INJURY PREVENTION17,6,618-6242016年10.1080/15389588.2015.11266711538-9588Objective: A cyclist assumes various cyclic postures of the lower extremities while pushing the pedals in a rotary motion while pedaling. In order to protect cyclists in collisions, it is necessary to understand what influence these postures have on the global kinematics and injuries of the cyclist.Method: Finite element (FE) analyses using models of a cyclist, bicycle, and car were conducted. In the simulations, the Total Human Model of Safety (THUMS) occupant model was employed as a cyclist, and the simulation was set up such that the cyclist was hit from its side by a car. Three representative postures of the lower extremities of the cyclist were examined, and the kinematics and injury risk of the cyclist were compared to those obtained by a pedestrian FE model. The risk of a lower extremity injury was assessed based on the knee shear displacement and the tibia bending moment.Results: When the knee position of the cyclist was higher than the hood leading edge, the hood leading edge contacted the leg of the cyclist, and the pelvis slid over the hood top and the wrap-around distance (WAD) of the cyclist's head was large. The knee was shear loaded by the hood leading edge, and the anterior cruciate ligament (ACL) ruptured. The tibia bending moment was less than the injury threshold. When the cyclist's knee position was lower than the hood leading edge, the hood leading edge contacted the thigh of the cyclist, and the cyclist rotated with the femur as the pivot point about the hood leading edge. In this case, the head impact location of the cyclist against the car was comparable to that of the pedestrian collision. The knee shear displacement and the tibia bending moment were less than the injury thresholds.Conclusion: The knee height of the cyclist relative to the hood leading edge affected the global kinematics and the head impact location against the car. The loading mode of the lower extremities was also dependent on the initial positions of the lower extremities relative to the car structures. In the foot up and front posture, the knee was loaded in a lateral shear direction by the hood leading edge and as a result the ACL ruptured. The bicycle frame and the struck-side lower extremity interacted and could influence the loadings on lower extremities.
学会発表自動車衝突時の下肢姿勢違いにおける自転車乗員の挙動・傷害への影響水口浩爾, 伊藤大輔, 水野幸治自動車技術会学術講演会2015年10月 14日北九州国際会議場A cyclist takes different postures of lower extremities while pushing the pedals. In this research, the kinematics of the whole body and injury risk of cyclist were examined for three representative postures of the lower extremities with and without cyclist traveling velocity. The knee height of the cyclist relative to the hood leading edge affected the kinematics and the head impact location against the car. The bicycle velocity influenced not only head impact location in the car lateral direction but also knee deformation.
論文自動車前面衝突における乗員の胸部傷害指標の検討査読有岩中泰樹, 伊藤大輔, 水野幸治, 田中良知自動車技術会論文集46,4,793-798-2015年7月 Chest deflection and acceleration of crash dummy have been used as chest injury measures in frontal crash test. In this research, mechanism and relation of the two chest injury measures were investigated. The seat belt path and force limiter load were changed to clarify the effects on the chest injury by Hybrid III dummy and human finite element models. The chest acceleration was derived from external and internal joint force and the effect of seatbelt path was small, whereas the chest deflection was affected by the seatbelt force and the seatbelt path.
学会発表車の衝突時の客室回転による乗員挙動への影響国際共著陳一唯, 水野幸治, 伊藤大輔, 細川成之, 韓勇自動車技術会学術講演会2015年5月 20日パシフィコ横浜The objective of this study is to understand the effects of car rotation on occupant kinematic behavior in vehicle impact with rotation. The method to provide the boundary condition for the occupants under car acceleration and rotation was formulated. Small overlap frontal crash (yawing), full-width crash (pitching) and offset impact tests (yawing and pitching) were examined by FE model simulations. The vehicle yaw motions had a small effect on the occupant kinematics. The vehicle pitch motions mitigated the loading on occupants in a frontal crash since the anchor of the seatbelt moved with vehicle pitch rotation, which increased ridedown of the occupant.
論文自動車衝突時における自転車乗員の挙動・傷害の有限要素解析査読有山田英史, 伊藤大輔, 水野幸治自動車技術会論文集46,3,639-644-2015年5月 Cyclists are frequently injured head and lower extremities in car-to-cyclist collisions. In this research, kinematic behavior of the whole body and the interaction of car, cyclist and bicycle were numerically investigated using a simulation with an FE simulation. Kinematic behavior of a cyclist was similar to that of a pedestrian, but the pelvis and head movement were different due to difference of posture of the lower extremities. Cyclist's tibia impacted to hood leading edge and shear loading was applied in the cyclist's knee, which can cause knee injury.
論文Crash Pulse Optimization for Occupant Protection at Various Impact Velocities査読有Daisuke Ito, Yusuke Yokoi, Koji MizunoTRAFFIC INJURY PREVENTION16,3,260-2672015年4月 10.1080/15389588.2014.9378051538-9588Objective: Vehicle deceleration has a large influence on occupant kinematic behavior and injury risks in crashes, and the optimization of the vehicle crash pulse that mitigates occupant loadings has been the subject of substantial research. These optimization research efforts focused on only high-velocity impact in regulatory or new car assessment programs though vehicle collisions occur over a wide range of velocities. In this study, the vehicle crash pulse was optimized for various velocities with a genetic algorithm.
Method: Vehicle deceleration was optimized in a full-frontal rigid barrier crash with a simple spring-mass model that represents the vehicle-occupant interaction and a Hybrid III 50th percentile male multibody model.
To examine whether the vehicle crash pulse optimized at the high impact velocity is useful for reducing occupant loading at all impact velocities less than the optimized velocity, the occupant deceleration was calculated at various velocities for the optimized crash pulse determined at a high speed.
The optimized vehicle deceleration-deformation characteristics that are effective for various velocities were investigated with 2 approaches.
Results: The optimized vehicle crash pulse at a single impact velocity consists of a high initial impulse followed by zero deceleration and then constant deceleration in the final stage. The vehicle deceleration optimized with the Hybrid III model was comparable to that determined from the spring-mass model.
The optimized vehicle deceleration-deformation characteristics determined at a high speed did not necessarily lead to an occupant deceleration reduction at a lower velocity.
The maximum occupant deceleration at each velocity was normalized by the maximum deceleration determined in the single impact velocity optimization. The resulting vehicle deceleration-deformation characteristic was a square crash pulse. The objective function was defined as the number of injuries, which was the product of the number of collisions at the velocity and the probability of occupant injury. The optimized vehicle deceleration consisted of a high deceleration in the initial phase, a small deceleration in the middle phase, and then a high deceleration in the final phase.
Conclusion: The optimized vehicle crash pulse at a single impact velocity is effective for reducing occupant deceleration in a crash at the specific impact velocity. However, the crash pulse does not necessarily lead to occupant deceleration reduction at a lower velocity. The optimized vehicle deceleration-deformation characteristics, which are effective for all impact velocities, depend on the weighting of the occupant injury measures at each impact velocity.
論文Aピラー衝突における自転車ヘルメットによる頭部保護査読有伊藤大輔, 笈田桂治, 小林吾一, 水野幸治, 吉田良一自動車技術会論文集46,2,1-8-2015年3月 25日The head protection with cyclist helmets in impacts against the A-pillar was investigated from experiments and finite element (FE) analyses. In the A-pillar impact tests at 35 km/h, the HIC was above the injury acceptance level even with helmet. The FE simulations of the headform impacts indicated that the helmet liner deformed locally, whereas the A-pillar deformation was small. In the FE analysis of a human head model with a helmet, the skull fracture did not occur but the brain strain was large. From a simple model of the head acceleration, the helmet liner characteristics has a little effect on the HIC at high velocity impacts.
論文ラット落下実験による胸部応答評価と人体有限要素モデルとの比較査読有伊藤大輔, 一杉正仁, 本澤養樹, 水野幸治日本交通科学学会誌14,2,15-21-2015年1月 31日自動車乗員が拘束装置からの負荷によって胸部に加速度が発生する状況をin vivo動物モデルにて再現できる実験系を構築することを目的として，ラットを用いた落下試験を実施し，加速度変化に対する胸部応答を評価した．さらに，人体においても類似の応答が得られることを確認するため，人体有限要素モデルを用いた衝撃シミュレーションを実施した．ラットの胸骨加速度は複数のピークを持つ波形となり，その最大値はほぼテーブル加速度の設定値と一致した．また，脊柱加速度は若干胸骨加速度より遅れて発生した．この傾向は人体有限要素モデルにおいても確認された．ラットの実験結果と人体有限要素モデルのシミュレーション結果を比較するため，幾何学的相似性を仮定してスケーリングを行ったところ，胸骨加速度に関してはほぼ同等の応答が得られた．小型動物モデルでもスケーリングを行うことで，人体の胸郭剛性の評価を補完・代替できる可能性が示された．
学会発表Aピラー衝突時における自転車乗員用ヘルメットの衝撃保護性能の研究笈田桂治, 小林吾一, 水野幸治, 伊藤大輔第27回日本機械学会バイオエンジニアリング講演会2015年1月 9日朱鷺メッセ新潟コンベンションセンター本研究では，頭部インパクタ及び人体頭部モデルを用いてヘルメット有無別に路面への落下，自動車との衝突について有限要素解析を行い，ヘルメットの頭部保護性能を検討した．
1.頭部インパクタによる解析において，ソフトシェルヘルメットの衝撃保護効果は大きかったが，人体モデルを用いた解析では，Aピラー衝突時においてソフトシェルヘルメット装着時に，頭頂部で骨折が生じた．
2.Aピラーの単純な変形を仮定した加速度波形モデルを用いた結果から，HICに対して衝突速度が低い場合はライナーとAピラーの変形特性の両者が影響するが，衝突速度が高い場合はAピラーの変形荷重の大きさの影響が大きい．
学会発表自動車前面衝突における拘束装置による乗員の胸部変形岩中泰樹, 水野幸治, 伊藤大輔第27回日本機械学会バイオエンジニアリング講演会2015年1月 9日朱鷺メッセ新潟コンベンションセンター本研究では，衝突ダミーHybrid IIIモデルと人体有限要素モデルを用いた衝突有限要素解析を行い，胸胸部加速度と胸たわみの発生要因およびフォースリミッタ荷重とシートベルトパス条件を変更した際の影響について検討した．
1.乗員の胸部加速度と胸たわみには相関関係があるが，胸部加速度にはダミー内力が影響する．
2.Hybrid IIIダミーでは，フォースリミッタ荷重やシートベルトパスなどの拘束条件の違いが胸たわみに大きな影響を及ぼすが，胸部加速度に対する影響は小さい．
3.ベルトパスやフォースリミッタ荷重などの拘束条件を検討する上では，Hybrid IIIに加え人体モデルでの確認が必要である．
学会発表足関節有限要素モデルの構築と交通事故外傷への適用下窪尚也, 水野幸治, 伊藤大輔第27回日本機械学会バイオエンジニアリング講演会2015年1月 9日朱鷺メッセ新潟コンベンションセンター本研究では，足関節の傷害発生時の現象をより詳細に解析するために，足関節モデルの構築を行った．骨，筋肉，靭帯について形状データを基に有限要素モデルを構築した．その後，打撃シミュレーションを行い，実験データと比較したところ，概ね妥当性のあるモデルであるという結果が得られた．
課題としては，特に足関節への負荷がピークに達した後の除荷段階において再現性の向上が挙げられる．
今後，このモデルを用いて，歩行者事故や前面衝突事故のシミュレーションを行い，足関節傷害の発生をより詳細に解析し，歩行者保護や乗員保護の研究に適用する．
論文Adult headform impact tests of three Japanese child bicycle helmets into a vehicle査読有Koji Mizuno, Daisuke Ito, Ryoichi Yoshida, Hiroyuki Masuda, Hiroshi Okada, Mitsunori Nomura, Chikayo FujiiACCIDENT ANALYSIS AND PREVENTION73,,359-3722014年12月 10.1016/j.aap.2014.09.0180001-4575The head is the body region that most frequently incurs fatal and serious injuries of cyclists in collisions against vehicles. Many research studies investigated helmet effectiveness in preventing head injuries using accident data. In this study, the impact attenuation characteristics of three Japanese child bicycle helmets were examined experimentally in impact tests into a concrete surface and a vehicle. A pedestrian adult headform with and without a Japanese child bicycle helmet was dropped onto a concrete surface and then propelled into a vehicle at 35 km/h in various locations such as the bonnet, roof header, windshield and A-pillar. Accelerations were measured and head injury criterion (HIC) calculated. In the drop tests using the adult headform onto a concrete surface from the height of 1.5 m, the HIC for a headform without a child helmet was 6325, and was reduced by around 80% when a child helmet was fitted to the headform. In the impact tests, where the headform was fired into the vehicle at 35 km/h at various locations on a car, the computed acceleration based HIC varied depending on the vehicle impact locations. The HIC was reduced by 10-38% for impacts headforms with a child helmet when the impact was onto a bonnet-top and roof header although the HIC was already less than 1000 in impacts with the headform without a child helmet. Similarly, for impacts into the windshield (where a cyclist's head is most frequently impacted), the HIC using the adult headform without a child helmet was 122; whereas when the adult headform was used with a child helmet, a higher HIC value of more than 850 was recorded. But again, the HIC values are below 1000. In impacts into the A-pillar, the HIC was 4816 for a headform without a child helmet and was reduced by 18-38% for a headform with a child helmet depending on the type of Japanese child helmet used. The tests demonstrated that Japanese child helmets are effective in reducing accelerations and HIC in a drop test using an adult headform onto a relatively rigid hard surface, i.e., simulating a road surface or concrete path. However, when the impact tests are into softer surfaces, the child helmet's capacity to decrease accelerations is accordingly reduced. Impacts into the windshield, while below the critical HIC value of 1000, indicated higher HIC values for a headform with a child helmet compared to an adult headform without a child helmet. The unpredictable nature of the results indicates further research work is required to assess how representative the stiffness of an adult headform is when compared to an actual head. (C) 2014 Elsevier Ltd. All rights reserved.
論文Bumper contact sensor for pedestrian collisions based on analysis of pedestrian kinematic behaviour査読有Daisuke Ito, Koji Mizuno, Takaharu Ueyama, Daisuke Nakane, Shingo WanamiInternational Journal of Crashworthiness19,5,514-523-2014年5月 10.1080/13588265.2014.917493In this research, a pedestrian contact sensor based on the pressure of a deformable chamber was investigated from finite-element (FE) analysis. In a simulation of a component test of a chamber impact, the internal pressure of the chamber increased with the volume deformation of the chamber according to Boyle's law. The chamber was installed above the top plane of the bumper energy absorber of a simple car model, and FE simulations of a car-pedestrian collision were conducted. The chamber deformed and its internal pressure increased as the bumper energy absorber deformed during contact with the pedestrian leg. It was shown that the pressure response of the chamber could be detected, irrespective of vehicle shape and structure. This particular pressure response in pedestrian collisions was different from that in collisions into other objects such as a road pole. The contact force of the bumper energy absorber tends to be linear with the pressure change of the chamber. It was shown that a pedestrian collision can be distinguished with high reliability from other colliding objects using the chamber pressure based on the colliding characteristics depending on each colliding object.
学会発表自動車の前面衝突における車両減速度の最適化国内共著横井祐輔, 水野幸治, 伊藤大輔日本機械学会東海支部第63期講演会2014年3月 18日大同工業大学
学会発表自転車乗員ヘルメットの衝撃保護性能の研究笈田桂治, 伊藤大輔, 水野幸治第26回日本機械学会バイオエンジニアリング講演会2014年1月 11日東北大学片平キャンパス本研究では，頭部インパクタ及び人体頭部モデルを用いてヘルメット有無別に路面への落下，自動車との衝突について有限要素解析を行い，ヘルメットの頭部保護性能を検討した．
1.頭部インパクタによる解析において，落下ではヘルメットによる大きな加速度低減効果がみられたが，Aピラー衝突においてはその効果は小さかった．また，加速度波形に対して，頭部とヘルメットの間隙およびヘルメットの慣性力が影響を及ぼすことがわかった．
2.人体モデルを用いた解析において，落下およびAピラー衝突解析ともに，ヘルメットによる頭蓋骨骨折の防止効果が大きいことがわかった．ただし，Aピラーの衝突時には，ヘルメット装着時であっても脳のひずみが大きくなり，脳損傷が発生する可能性が大きいと考えられる．
論文Optimization of Vehicle Deceleration to Reduce Occupant Injury Risks in Frontal Impact査読有Koji Mizuno, Takuya Itakura, Satoko Hirabayashi, Eiichi Tanaka, Daisuke ItoTRAFFIC INJURY PREVENTION15,1,48-552014年1月 10.1080/15389588.2013.7924081538-9588Objective: In vehicle frontal impacts, vehicle acceleration has a large effect on occupant loadings and injury risks. In this research, an optimal vehicle crash pulse was determined systematically to reduce injury measures of rear seat occupants by using mathematical simulations.
Method: The vehicle crash pulse was optimized based on a vehicle deceleration-deformation diagram under the conditions that the initial velocity and the maximum vehicle deformation were constant. Initially, a spring-mass model was used to understand the fundamental parameters for optimization. In order to investigate the optimization under a more realistic situation, the vehicle crash pulse was also optimized using a multibody model of a Hybrid III dummy seated in the rear seat for the objective functions of chest acceleration and chest deflection. A sled test using a Hybrid III dummy was carried out to confirm the simulation results. Finally, the optimal crash pulses determined from the multibody simulation were applied to a human finite element (FE) model.
Results: The optimized crash pulse to minimize the occupant deceleration had a concave shape: a high deceleration in the initial phase, low in the middle phase, and high again in the final phase. This crash pulse shape depended on the occupant restraint stiffness. The optimized crash pulse determined from the multibody simulation was comparable to that from the spring-mass model. From the sled test, it was demonstrated that the optimized crash pulse was effective for the reduction of chest acceleration. The crash pulse was also optimized for the objective function of chest deflection. The optimized crash pulse in the final phase was lower than that obtained for the minimization of chest acceleration. In the FE analysis of the human FE model, the optimized pulse for the objective function of the Hybrid III chest deflection was effective in reducing rib fracture risks.
Conclusions: The optimized crash pulse has a concave shape and is dependent on the occupant restraint stiffness and maximum vehicle deformation. The shapes of the optimized crash pulse in the final phase were different for the objective functions of chest acceleration and chest deflection due to the inertial forces of the head and upper extremities. From the human FE model analysis it was found that the optimized crash pulse for the Hybrid III chest deflection can substantially reduce the risk of rib cage fractures. Supplemental materials are available for this article. Go to the publisher's online edition of Traffic Injury Prevention to view the supplemental file.
学会発表遺伝的アルゴリズムを用いた乗員保護のための車両減速度の最適化横井祐輔, 伊藤大輔, 水野幸治自動車技術会学術講演会2013年10月 23日名古屋国際会議場
国際学会An Inverse Finite Element Approach for Estimating the Fiber Orientations in Intercostal MusclesHamzah M, Subit D, Boruah S, Forman J, Crandall J, Ito D, Ejima S, Kamiji K, Yasuki TIRCOBI (International Research Council on Biomechanics of Injury) Conference 20132013年9月 11日
国際学会Occupant kinematic behavior and effects of a motorized seatbelt on occupant restraint of human volunteers during low speed frontal impact: mini-sled tests with mass production car seat.Ito D, Ejima S, Kitajima S, Katoh R, Ito H, Sakane M, Nishino T, Nakayama K, Ato T, Kimura TIRCOBI (International Research Council on Biomechanics of Injury) Conference 20132013年9月 11日
国際学会Hyper-viscoelastic Response of Perfused Liver under Dynamic Compression and Estimation of Tissue Strain Thresholds with a Liver Finite Element Model国内共著Sato F, Yamamoto Y, Ito D, Antona-Makoshi J, Ejima S, Kamiji K, Yasuki TIRCOBI (International Research Council on Biomechanics of Injury) Conference 20132013年9月 11日
国際学会Assessment of a pre-crash seatbelt technology in frontal impacts by using a new crash test sled system with controllable pre-impact braking国内共著Ito, D, Ejima, S, Sukegawa, Y, Antona, J, Ito, H, Komeno, F23rd International Technical Conference on the Enhanced-Safety of Vehicles2013年5月 27日
論文ブレーキ制動を伴う衝撃実験におけるモータライズドシートベルトの乗員保護効果に関する検討査読有伊藤大輔, 江島晋, 加藤良祐, 鮏川佳弘, 伊藤久雄, 阿藤忠之, 木村隆章自動車技術会論文集44,1,137-142-2013年1月
論文Evaluation of mechanical propertiesof skeletal muscle with strain injury査読有Ito, D, Yamamoto, S, Tanaka, E, Mizuno, K, Hitosugi M, Tokudome, SJournal of Biomechanical Science and Engineering7,2,156-167-2012年3月 13日10.1299/jbse.7.156
論文プリクラッシュ時における筋応答による姿勢維持の効果に関する研究査読有江島晋, 座間淑夫, 伊藤大輔, 小野古志郎, 上地幸一, 安木剛自動車技術会論文集42,1,55-60-2011年1月
論文A novel constitutive model of skeletal muscle taking into account anisotropic damage査読有D. Ito, E. Tanaka, S. YamamotoJOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS3,1,85-932010年1月 10.1016/j.jmbbm.2009.05.0011751-6161The purpose of this study is to develop a constitutive model of skeletal muscle that describes material anisotropy, viscoelasticity and damage of muscle tissue. A free energy function is described as the sum of volumetric elastic, isochoric elastic and isochoric viscoelastic parts. The isochoric elastic part is divided into two types of shear response and the response in the fiber direction. To represent the dependence of the mechanical properties on muscle activity, we incorporate a contractile element into the model. The viscoelasticity of muscle is modeled as a three-dimensional model constructed by extending the one-dimensional generalized Maxwell model. Based on the framework of continuum damage mechanics, the anisotropic damage of muscle tissue is expressed by a second-order damage tensor. The evolution of the damage is assumed to depend on the current strain and damage. The evolution equation is formulated using the representation theorem of tensor functions. The proposed model is applied to the experimental data on tensile mechanical properties in the fiber direction and the compression properties in the fiber and cross-fiber directions in literature. The model can predict non-linear mechanical properties and breaking points. (C) 2009 Elsevier Ltd. All rights reserved.
国際学会Pathological change in muscle contusion with direct impact loading国内共著Yamamoto, S, Taniguchi, T, Ito, D, Mizuno, K, Tanaka, E, Hitosugi, M, Tokudome, SThe 14th European Society of Biomechanics Conference2004年7月 4日