2205 単純化モデルを用いた薄肉はりの衝突性能設計支援システムの開発(OS9-1 システム最適化,OS9 システム最適化)

抄録

Finite element methods have been widely utilized in crashworthiness analyses of automotive frame structures, and the results can successfully provide design engineers with beneficial information concerning crash phenomena. However, the use of such finite element methods for crashworthiness analysis during the conceptual design phase is currently problematic since they usually employ a large number of shell elements, required for accurate prediction of nonlinear collapse behavior, which entails massive computational cost. This paper proposes an optimal crashworthiness design method for straight thin-walled columns using simplified models using beam and non-linear spring elements. Therefore, crush mechanism and respose surfacemethod are applied to decide respondence of non-linear spring, and genetic algorithms are used to solve the optimization problem. The proposed optimization method is applied to a numerical example problem and the optimal solution obtained using the simplified analysis model is compared with the result when using a detailed analysis employing shell elements. The optimal solution provided by the simplified analysis model agrees well with the solution based on detailed analysis results.