基于子模型的镁合金车体刚度联合优化

Stiffness Optimization of Magnesium Alloy Car Body Based on Submodel

以提升镁合金车体底架边梁刚度为目标,提取车体底架边梁边界,建立边梁子模型,对结构进行拓扑优化,获得边梁型材分布;在此基础上采用HyperStudy软件,进行试验设计,建立关于应变能、质量的边梁尺寸形状协同优化代理模型,开展边梁结构型腔多目标优化,同时对最优构型进行刚度分析验证。结果表明:相比原结构,车体边梁最大下挠减小18.47%,刚度明显改善,通过结构优化可有效补偿镁合金车体刚度下降。

The boundary of the side beam of the car frame was extracted,the side beam sub-model was established,and the topological optimization of the structure was carried out to obtain the profile distribution of the side beam.On this basis,HyperStudy sofware was used to design the experiment,and a surrogate model for the collaborative optimization of the size and shape of the side beam was established on strain energy and mass,and the multi-objective optimization of the cavity of the side beam structure was carried out.Stiffness analysis and verification of the optimal configuration were carried out.The results show that,compared with the original structure,the maximum deflection of the side beam of the car body is reduced by 18.47%,and the stiffness of the car body is obviously improved.The structural optimization can effectively compensate the stiffness decline of the magnesium alloy body.