某前副车架性能分析与轻量化设计

PERFORMANCE ANALYSIS AND LIGHTWEIGHT DESIGN OF A FRONT SUBFRAME

为了校核某前副车架的性能是否满足设计要求,首先基于有限元方法建立前副车架网格模型,对其进行模态性能分析,分析结果表明其前两阶固有频率均高于发动机激励频率,符合动态性能要求。然后对其进行模态试验,试验结果表明其仿真分析具有较高的准确度。再建立前悬架多体动力学模型,并根据理论受力分析加载,以此得到其在典型工况下各个外连接点的载荷。再基于惯性释放方法对其进行强度性能分析,分析结果表明其最大应力小于材料屈服值,满足强度特性要求。最后基于集成平台并采用邻域培植多目标遗传算法对其进行轻量化设计,得到其最优的厚度,优化之后其模态性能和强度性能均能够满足要求,其重量成功减轻了9.9%,并且通过了实车道路试验验证。该分析方法为结构性能的获取及其优化设计提供了理论参考和科学借鉴。

Aiming at checking the performance of a front subframe whether could meet the design requirements.Firstly,the grid model of the front subframe was built by adopting finite element method,and it was modal performance analyzed,the analysis result showed that its first two natural frequency were higher than the engine excitation frequency,so it could meet dynamic performance requirements.Secondly,the front subframe was modal tested,the test result showed that its simulation analysis precision was high.Thirdly,the front suspension dynamic model was built,and it was load based on theoretical forces,so its connection point load of typical working condition were obtained.Fourthly,the front subframe was strength analyzed by adopting inertia release method,the analysis result showed that its stress were lower than material yield value,so it could meet meet the strength characteristics.Lastly,the front subframe was lightweight designed by adopting neighborhood cultivation multiobjective genetic algorithm,the optimal thickness were obtained.Its modal performance and strength performance could meet the requirements after optimization,its weight had been successfully reduced by 9.9%,and it had passed the real vehicle road test verification.The theoretical and scientific reference were provided for obtaining the structural performance and optimization design.