关键词: 白车身；轻量化；有限元分析；代理模型；尺寸优化

Abstract: The body lightweight design is of great significance to the energy saving and emission reduction of vehicles. In order to reduce the weight of a certain sport utility vehicle (SUV) model in the late stage of development, the agent model technology is applied to build the body in white optimization process. Firstly, the finite element model of SUV body in white is established, and the torsional stiffness performance is simulated and analyzed as the constraint condition of optimization design. Through two sensitivity analyses, 66 key components and 38 design variables are screened. Based on Isight optimization platform, the design of experiments is carried out and a angent model aiming at the body mass is constructed. The HYBRID algorithm is used to optimize the thickness of key components. After optimization, the torsional stiffness of the body in white is basically unchanged, and the body mass is reduced. This optimization process has a good effect on body in white weight reduction in the late stage of vehicle development.

Key words: Body in white; Lightweight; Finite element analysis; Agent model; Size optimization