Abstract: To further reduce structural mass and improve material utilization, a lightweight design study is conducted for the thrust rod support of a commercial vehicle. On the premise that the structural strength and modal performance meet the design requirements, topology optimization is performed based on the Nastran finite element analysis platform. Under multiple loading constraints, the material distribution of the support structure is reconstructed and iteratively optimized. The objective function is set to minimize the volume fraction, with constraints imposed on equivalent stress and the first-order natural frequency. The results show that the support weight is reduced from 12.1 kg to 7.4 kg, achieving a weight reduction of 38.8%, while all performance indicators remained within acceptable limits. While ensuring the performance of key structural components of commercial vehicles, this study provides a feasible path and engineering reference for lightweight design.

Key words: lightweight; Nastran; topology optimization; structural strength; modal frequency; support design

摘要： 为进一步降低结构质量，提升材料利用率，针对某商用车推力杆支座开展轻量化设计 研究。在保证结构强度与模态性能满足要求的前提下，基于 Nastran 有限元分析平台，结合拓 扑优化方法，对支座在多工况约束下的材料分布进行重构与迭代优化。优化过程中以体积分 数最小化为目标函数，并施加等效应力、第一阶模态频率等多项性能约束条件。结果表明， 优化后支座质量由 12.1 kg 降至 7.4 kg，减重达 38.8%，各项性能指标均满足设计要求。在保 证商用车关键结构件性能的前提下，研究为轻量化设计提供了可行路径与工程参考。

关键词: 轻量化；Nastran；拓扑优化；结构强度；模态频率；支座设计