Chassis frame of electric vehicle contains several thin-walled tube structures that can provide an important component for installing the power unit and supporting the body in white of vehicle. Thus, design a chassis frame is a multi-objective optimization and multi-parameter problem. To address it, the contributions of design variables to the performance indicators of chassis frame are studied first, and obtained the optimal design variables. The effects of the design parameters on the objective responses are analyzed based on a polynomial response surface model. Moreover, to determine optimal solution between the conflicting performance indicators of the chassis frame, an integrated approach based on lightweight and crashworthiness is presented to analysis the performance and determine the Pareto fronts. In addition, the optimal solution is acquired from the Pareto fronts by the grey relational analysis and game theory. Experiments corresponding to the numerical analysis are performed to verify the feasibility of the optimized strategy and the performance of the optimized chassis frame structure. Results show that according to the optimal parameters of chassis frame, the lightweight performance can be improved significantly, while the linear performance and crashworthiness performance of chassis frame are ensured.

电动汽车的底盘框架包含多个薄壁管结构，可以为安装动力单元和支撑汽车白色车身提供重要部件。因此，设计底盘车架是一个多目标优化和多参数的问题。为此，首先研究了设计变量对底盘车架性能指标的贡献，得到了最优设计变量。基于多项式响应面模型分析了设计参数对客观响应的影响。此外，为了确定底盘车架性能指标冲突的最佳解决方案，提出了一种基于轻量化和耐撞性的综合方法来分析性能并确定帕累托前沿。此外，通过灰色关联分析和博弈论从帕累托前沿获得最优解。进行了与数值分析相对应的实验，以验证优化策略的可行性和优化后的底盘车架结构的性能。结果表明，根据底盘车架优化参数，在保证底盘车架的线性性能和耐撞性能的同时，轻量化性能得到显着提升。