Abstract: Based on the given powertrain design space, the optimal material distribution path analysis of the engine bracket is carried out through static and dynamic multi-objective collaborative topology optimization technology, and a new lightweight bracket structure design form is reconstructed based on the topology optimization results. The results show that the maximum equivalent stress of the structure corresponding to the most dangerous working condition of the bracket is 182 MPa, and the maximum structural principal stress of the engine bracket under dynamic ultimate load is 151 MPa. The first-order frequency of the structure converges to 826 Hz. Its structural durability, strength, and mode can all meet the design requirements. At the same time, through physical bench durability and strength performance tests, it is proved that topology optimization technology is adaptable and reliable in the conceptual design of automotive structures, providing technical support for subsequent engine bracket optimization design.

Key words: topology optimization; lightweight; strength and durability; engine bracket; bench test

摘要： 基于给定的动力总成设计空间，通过静动态多目标协同拓扑优化技术对发动机支架进 行最佳材料分布路径分析，并根据拓扑优化结果重构新型轻质支架结构设计形式。结果表明， 支架最危险工况相应的结构最大等效应力为 182 MPa，动态极限载荷下的发动机支架最大结 构主应力为 151 MPa，结构一阶频率收敛于 826 Hz。其结构性耐久、强度及模态均均满足设 计要求，同时通过实物台架耐久及强度性能试验，证明拓扑优化技术在汽车结构概念设计中的 适应性和可靠性，为后续发动机支架优化设计提供技术支撑。

关键词: 拓扑优化；轻量化；强度耐久；发动机支架；台架试验