Abstract: In order to deal with the problem of mounting bracket fracture of a heavy truck during vehicle road test, this paper combined FEM with bench and vehicle tests. The results of structure strength analysis showed that the maximum stress 250.6 MPa was much greater than allowable stress 128 MPa. Then topology optimization of the bracket was carried out, which aimed at a new structural optimization bracket of minimum weight bracket subjected to stress constraints. Then the optimization bracket was verified by bench and road test. Finally, base on minimizing material use, the optimization bracket met strength requirement, succeeded in solving the fracture problem, and provided reference for solving similar engineering problem.

Key words: Mounting bracket; Structural strength; Bench test; Topology optimization

摘要： 文章针对某重卡动力总成悬置软垫底座在整车道路试验过程中的断裂问题，运用有限 元分析、台架测试和整车试验相结合的方法，通过对初始底座强度分析，发现最大应力 250.6 MPa 远大于许用应力 128 MPa。接着，对其进行拓扑优化分析，研究在应力约束下重量最小 底座结构的拓扑优化设计，使优化后结构材料分布最优。最后对优化后结构进行强度分析、 台架测试和整车道路试验验证，在尽量控制质量增加（0.22 kg，10%）的情况下，满足强度 要求，解决底座断裂问题，为相似工程问题的解决提供参考。

关键词: 悬置软垫底座；结构强度；台架试验；拓扑优化