橡胶悬置结构参数对高频动刚度影响分析

Aralysis of Effect of Structural Parameter of Rubber Suspension on High frequency Dynamic Stiffness

针对新能源汽车驱动电机高频激励引发的噪声、振动与声振粗糙度问题,对某实心圆柱橡胶悬置进行建模,分析结构参数对高频动刚度的影响。根据橡胶悬置的模态振型特点,分析橡胶基体中圆孔数量、内孔直径、内孔长度、内孔形状对高频动刚度的影响。结果表明,在橡胶基体中开设圆孔能够有效减小橡胶悬置高频动刚度。但是,开设圆孔会使低频区共振峰峰值增大,峰值频率向前移动,尤其是轴向共振峰峰值频率向前移动较大。橡胶基体内孔直径、长度、形状对轴向动刚度影响不显著,内孔直径减小、内孔长度增大会在一定程度上减小径向动刚度。

In order to solve the NVH problem caused by high frequency excitation of new energy vehicle drive motor,a solid cylindrical rubber suspension was modeled,and the effect of structural parameter on high frequency dynamic stiffness was analyzed.According to the modal shape characteristic of rubber suspension,the effects of the number of circular holes,the diameter of inner hole,the length of inner hole and the shape of inner hole in the rubber matrix on high frequency dynamic stiffness were analyzed.The result shows that the high frequency dynamic stiffness of rubber suspension can be effectively reduced by opening circular hole in the rubber matrix.However,opening circular hole will increase the resonance peak value in the low frequency region and the peak frequency will move forward,especially the axial resonance peak frequency will move forward even more.The diameter,length,and shape of inner hole in the rubber matrix have no significant effect on the axial dynamic stiffness.The decrease of the diameter of inner hole and the increase of the length of inner hole will reduce the radial dynamic stiffness to a certain extent.