차량 A-필러, 패키지 트레이 경량화를 위한 소재 선정 최적설계

Abstract

This study proposes an optimal material selection method for minimizing the weight of A-pillar and package tray while satisfying design requirements on static stiffness values and dynamic stiffness values. First, we formulate a material selection optimization problem. Next, we establish the CAE procedure of evaluating static and dynamic stiffness values. Then, to enhance the efficiency of design work, we integrate and automate the established CAE procedure using a commercial process integration and design optimization tool, PIAnO. For effective optimization, we adopt the approach of metamodel based approximate optimization. We select sampling points using an orthogonal array for generating radial basis function regression models, and carry out the optimization for selecting optimum material combination using an evolutionary algorithm that can handle discrete design variables. Material optimization result reveals that the weight is reduced by 49.8% while satisfying all the design constraints.