某车型发动机悬置后支架优化设计和疲劳分析

针对某车型发动机在振动强化试验中悬置后支架出现开裂的问题,建立悬置后支架有限元模型并进行应力分析,发现应力分析结果与试验结果一致,且原支架结构应力集中现象非常明显,主要分布在侧筋根部；用OptiStruct对悬置后支架进行拓扑优化设计,结果表明拓扑优化材料应主要布置在底部和侧筋.在此基础上,通过4种优化方案的对比得到质...

Optimization design and fatigue analysis on engine rear mount bracket of automobile

As to the problem that there is cracks on engine rear mount bracket of an automobile during vibration enhancement test, the finite element model of rear mount bracket is established and the stress is analyzed, the result is consistent with the test result, and the stress concentration on the original bracket structure is obvious, which is mainly located at the side rib bottom; topology optimization design is performed on rear mount bracket by OptiStruct and the results indicate that the topology optimization material should be arranged at the bottom and the side ribs; based on the optimization results, four optimization schemes are compared to obtain the lightweight design with lightest mass, lowest stress level and better stress distribution, and the substituted material is analyzed to prove the rationality; fatigue analysis is performed on original structure and the optimized structure, and the results indicate that the life of the side ribs bottom is shortest and the fatigue area of the new structure is small. The optimized rear mount bracket can overcome the crack problem, and ensure the rationality of substituted material and performance improvement.