차체 다분야 구속 최적 설계

This study was conducted to establish initial process for integrated optimal design considered multi-disciplinary constrained conditions. Multi-disciplinary constrained conditions mean that lightweight design, structure stiffness and safety. Process was constructed with 4-phase. First phase is formatting the base model. In this study, base model was simplified for efficiency of analysis and also verified with test data simultaneously. In second phase, effect analysis was performed to select design variables largely effecting on performance such as bending and torsion stiffness. Form second phase, totally 11 design variables were selected finally among the 105 variables. Third phase is formatting RBF type Meta-model established by using selected design variables and LHC design of experiment(DOE). In the last phase, optimum result was calculated by using the LS-OPT program. Bending, Torsion stiffness and roof crush reaction force were used for constrained conditions and mass minimization was object function for optimization. This study is first-year result among the three years plan. Therefore more design variables and detail load case for safety such as frontal, side, rear and damageability will be applied to next step study.