Abstract: The lower control arm needs to have a certain strength and stiffness to resist extrusion, impact deformation, and also needs to have a high natural frequency to avoid low-frequency resonance and noise. Taking the lower control arm of a research automotive as the lightweight design object in this paper, the design risk of insufficient buckling force is identified through simulation analysis, and the control arm is redesigned using a combination of shape and topology optimization methods, and performance simulations are conducted on the new design. The results show that the new control arm eliminated the design risk of insufficient buckling force, resulting in 6.6% weight reduction compared to the original design. This paper adopts linear optimization method to solve the highly nonlinear buckling force optimization problem, identifies the load transmission path through topology optimization, and provides new ideas for the buckling force optimization and lightweight design of automotive control arms.

Key words: Lower control arm; Shape optimization design; Lightweight design; Buckling performance

摘要： 汽车下控制臂需要具备一定的强度和刚度以抵抗挤压、冲击变形，还需要具备较高的 固有频率，以避免低频共振，产生噪音。文章以某在研汽车下控制臂为轻量化设计对象，通 过仿真分析识别出屈曲力不足的设计风险，综合运用形状、拓扑优化方法重新设计了控制臂， 并对新设计进行性能仿真。结果表明，新控制臂消除了屈曲力不足的设计风险，新设计较原 设计减重 6.6%。文章采用线性优化方法解决高度非线性的屈曲力优化问题，采用拓扑优化识 别出载荷的传递路径，为汽车控制臂的屈曲力优化及轻量化设计提供新思路。

关键词: 下控制臂；形状优化设计；轻量化设计；屈曲性能