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The “Statistical Design Support System” produces a new practical optimal design method. It can be used even on nonlinear behavior. The optimization can be carried out with this system using a small number of calculation results. The authors applied it to the design optimization of the occupant restraint system in order to reduce the injury criteria based on the crash simulation. In line with growing interest and improvements in technology on vehicle safety, it will be necessary to consider some different crash situations simultaneously. The authors made an optimal design taking into account the different collision conditions. This paper describes the effectivity analysis and the optimization.

The Statistical Design Support System (SDSS) produces a new practical optimal design methodology with which optimization can be done using a small number of case studies. In prior study, the authors applied it to the optimization of design parameters of occupant restraint system, and have tried to reduce the injury criteria of occupants based on the crash simulation. However, response surfaces did not have enough accuracy in approximation. Therefore the authors made detailed investigation on the relationship between occupant restraint system and injury criteria. This paper also discusses the possibility to improve approximating accuracy of response surfaces for injury criteria. Furthermore, based upon the results of detailed effectivity study, only the important design factors were chosen for the optimum design analysis. In the optimization analysis, the occupant’s figure was handled as an uncertain factor.