J022022 筋活動を考慮可能な人体有限要素モデルの開発と衝突時の頭頚部挙動の検証([J022-02]傷害防止工学(2))

Abstract

Head injury is still the most common fatal injury according to traffic accident data of year 2011 reported by National Police Agency in Japan. Therefore, it is hoped that the head injury mechanism is elucidated to reduce the number of head injuries. The occurrence of head injury could be affected by head-neck motion during impacts while the head-neck motion could be affected by muscle activity of occupants with bracing conditions. In this study, we developed a human body finite element model with muscle activity for more accurate prediction of the head-neck motion during impacts. The developed model can simulate 3-D geometry of each muscle and reproduce muscle stiffness change for inputted muscle activation level. The model was validated against head-neck responses in frontal impact, lateral impact, and low-speed rear impact. The head-neck responses predicted by the model without muscle activity showed good agreement with those of cadaver test data in the three impact conditions. The head-neck response predicted by the model with muscle activity showed good agreement with that of volunteer test data in low-speed rear impact. These simulation results indicate that the model has high biofidelity for head-neck responses during impacts and the model can be used for investigation on muscular effects for head-neck responses during impacts.