基于ANSYS的汽车后桥桥壳仿真及优化

Simulation and Optimization of Automobile Rear Axle Housing Based on ANSYS

基于某型号汽车的后桥桥壳建立有限元模型,并利用有限元仿真软件ANSYS对该后桥桥壳模型满载工况下进行强度分析,在此基础上,采用拓扑分析优化节点的编号来减少整体刚度矩阵的带宽,实现对其空间结构的优化。结果表明:在不影响汽车各方面的性能要求下,优化后的后桥桥壳质量从58.097 kg降到了37.064 kg,总质量降低了36.2%,最大应力从76 MPa降为72 MPa,最大位移为0.111 96 mm,满足国际规定的满轴载荷每米轮距最大位移变形不超过1.5 mm的要求,为此类设计提供参考依据。

Taking the rear axle housing of a certain model car as the research object,the three-dimensional model of the rear axle housing is established using CATIA.The finite element simulation software ANSYS is used to analyze the strength of the rear axle shell model under full load.On this basis,topological analysis is used to optimize the number of nodes to reduce the bandwidth of the overall stiffness matrix and optimize its spatial structure.The results show that the mass of the optimized rear axle housing is reduced from 58.097 kg to 37.064 kg without affecting the performance requirements of all aspects of the car,and the total mass is reduced by 36.2%.The maximum stress is reduced from 76 MPa to 72 MPa.And the maximum displacement is 0.11196 mm,which satisfies the requirements of the international regulations for the maximum displacement of the full-shaft load per meter of the wheelbase not exceeding 1.5 mm,providing a reference for such design.