Abstract: For the purpose of performance and lightweight optimization, this paper establishes the finite element model of the steel subframe, obtains its constraint mode, and carries out strength analysis on the typical working conditions of forward emergency braking, limit steering, and single-side deep pit crossing, and carries out dynamic stiffness analysis on the installation point of swing arm. Then, based on the hard point of the steel front subframe of the vehicle model, through the global optimization strategy of genetic algorithm. The lightweight scheme of extruded aluminum front subframe was designed, and the weight was successfully reduced by 34%, which has certain reference significance.

Key words: Extruded aluminium; Subframe; Lightweight; Performance objectives; Finite element

摘要： 以副车架性能及轻量化为优化目的，通过建立钢制副车架的有限元模型，求得其约束 模态，并对向前紧急制动、极限转向、单侧过深坑常用典型工况进行强度分析，对摆臂安装 点进行动刚度分析。然后基于该车型钢制前副车架硬点，通过遗传算法的全局优化策略，设 计挤压铝前副车架轻量化方案，成功减重 34%，具有一定的借鉴意义。

关键词: 挤压铝；副车架；轻量化；性能目标；有限元