A simplified numerical simulation method to evaluate the generated acceleration value on an occupant at accidental collision is presented. Preceding study has been focused mainly on the behavior of human body seated fore faced. Addition to these studies, this study focuses on the behavior of the human body seated back faced. A series of numerical simulation is carried out with simplified 2D model of both a human body and a seat, changing the stiffness of seat, seat belt and connecting stiffness between a seat and a vehicle body. Finally, a possibility to decrease the maximum acceleration value by the simulation results is shown.


The injury caused by traffic accidents, such as a collision to the quay of a high-speed ship, is very serious, and not a few people are killed as a result. Even if you escaped from the death, you may lose major function on human body such as athletic ability. This loss has large effects on not only you but your family for a long time. Many efforts have been paid for the reduction of injury caused by the traffic accidents by the Ministry of Land, Infrastructure and Transport and automobile industries in Japan. They have carried out many experiments and numerical simulations for the verification of safety at the accidents. Many protection devices, such as seat belts and air bags, have been developed with these activities which are so helpful to decrease the probability to die or to be injured. The suitable seat system for children was developed as a measure. According to the experimental research on child seats, the child seats which are set to backwards, seem to fix the body more tightly than those which are set to forwards, at accidents, because of the resistance caused by the back reclining of the seat.

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