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The design of automobile human safety is a very important design factor, which the car manufacturers have recently focused. Crash tests have provided information on dummy response measurements such as the maximum chest acceleration head injury criteria (HIC) value and femur loading. The subject of this research is an optimal design of the seat belt in consideration of the deformation behavior of a vehicle cabin with the aim of reducing the human injury. The research focuses on the optimization method of taking the comprehensive trade off between the global approximation and computational cost. The optimization approach called Most Probable Optimal Design (MPOD) proposed by the authors is modified to be applicable to the optimization of cabin crash deformation behavior and safety belt with the mixed discrete and continuous design variables. The application example of the Hybrid III dummy model shows that the MPOD technique is effective in saving the computational cost.

This paper describes a non-linear analysis of automobile body structure by the finite element method. Numerical calculations were made for both the roof crush resistance and seat belt anchorage strength of a body structure and were compared with test results. Dynamic analysis was also made by an incremental method similar to that used for the static case. Results calculated for both situations indicate correspondence well with experimental results.