关键词: 车身骨架；有限元；多目标优化；静态刚度分析；电动车

Abstract: Aiming at the problems of frequent traffic accidents and insufficient research on the body frame of a micro-electric vehicle, this paper adopts the concepts of computer aided engineering (CAE) analysis and multi-objective optimization design to optimize the static characteristics of the body frame of a micro-electric vehicle based on the finite element model of the body frame. Three groups of schemes are compared to make a trade-off between model accuracy and computational efficiency, and the optimal optimization scheme is obtained. Between the comparison of final optimization results and computational efficiency, the scheme using moving least square method in scheme 3 is the best in terms of accuracy and efficiency. After optimization, the torsional rigidity of the body increases by 410.75 N?m/° and the bending rigidity increases by 1 041.2 N/mm, and the static performance of the body skeleton is significantly improved without significant changes in the body mass.

Key words: Body frame; Finite element; Multi-objective optimization; Static stiffness analysis; Electric vehicle