新能源汽车悬置支架轻量化研究

Lightweight Optimization of New Energy Car’s Mount Bracket

借鉴传统发动机汽车悬置支架的研究方法,对某纯电动车动力总成悬置系统的支架进行校核和优化。首先利用HyperMesh软件建立3个悬置支架的有限元模型,对其进行刚度计算和模态仿真分析,然后参照北美通用传统车载荷工况,选择电动车的最大应力极限工况进行各悬置支架的校核,最后对某一设计过于保守的悬置支架进行了基于拓扑方法的优化。结果表明,3个悬置支架的刚度、强度和模态频率都满足设计要求,改进后的某悬置支架在满足各项要求的基础上质量减少了3%。

Referring to the design and optimization method of the traditional engine vehicle mounting bracket,the bracket of the pure electric vehicle power-train mounting system is checked and optimized.Firstly,finite element model of the three mount brackets is set up to conduct the stiffness calculation and its modal simulation analysis.Then referring to the traditional North American GM vehicle load conditions,the maximum stress limit condition of electric vehicles is selected to check each mounting bracket.Finally,a conservative mounting bracket is optimized with topology-based approach.The results show that stiffness,strength and modal frequencies of three mounting brackets meet the design requirements.The mass of the improved suspension bracket is reduced by 3%on the basis of meeting the requirements.