基于结构拓扑优化的三合一电驱动系统NVH性能改进方法

NVH Performance Improvement Method of the Three-in-one Electric Drive System Based on Structural Topology Optimization

以某三合一电驱动系统为研究对象,为了改善其NVH(Noise,Vibration,Harshness)性能,从结构传递路径的角度进行设计和优化。首先,利用解析法、频率定位法和板件贡献量分析法等方法,识别出对电驱总成NVH贡献量最高的薄弱部件;然后,以提升控制器盖板(NVH贡献量最高的薄弱部件)的模态频率为优化目标,以体积分数为约束,对其材料的分布进行了优化设计。仿真结果表明,优化后的盖板各阶模态频率均有所提升,其首阶模态提升率达到34%,单位激励下的声功率级降低2~7 dB。最后,对优化盖板的电驱总成进行了NVH台架性能测试。试验结果表明,与原电驱动总成相比,优化盖板的电驱动总成的总声压级在不同频率范围内均有一定的降低,尤其中高频段的降低效果更显著,降低2~4 dB。

In order to improve the NVH performance of a three-in-one electric drive system,the structural transmission path is designed and optimized.Firstly,the weak components with the highest NVH contribution to the electric drive assembly were identified by analytical method,frequency positioning method and plate contribution analysis method.Then,the material distribution of the controller cover plate(the weak component with the highest NVH contribution)was optimized with the modal frequency as the optimization goal and the volume fraction as the constraint.The simulation results show that the frequency of each mode of the optimized cover plate is increased,the first mode is increased by 34%,and the sound power level under unit excitation is reduced by 2-7 dB.Finally,NVH bench performance test was carried out on the electric drive assembly with optimized cover plate.The test results show that compared with the original electric drive assembly,the total sound pressure level of the electric drive assembly optimized cover plate has a certain reduction in different frequency ranges,especially in the middle and high frequency band,and the reduction effect is more significant,reducing 2-4 dB.