车内低频噪声与悬架特性参数的定量关系

Quantitative Relationship between Low Frequency Interior Noise and Suspension Characteristic Parameters of a Vehicle

基于车身乘坐室声振耦合的动态子结构修改方法,将汽车悬架系统视为附加于车身上的子结构(子系统),并结合悬架系统对路面不平度位移激励的振动传递效应,揭示出车内低频噪声的声压值与悬架系统刚度、阻尼、非悬挂质量以及轮胎径向刚度、径向阻尼间的直接定量关系。然后,通过算例及相应的实验验证了其正确性。

Regarding the suspension system as a substructure （subsystem） appended on the car body, and considering the vibration transfer effect of the suspension system for the displacement excitation induced by unevenness of road surface, an explicit formula about the quantitative relationship between the sound pressure of low frequency interior noise and some of the suspension characteristic parameters of a vehicle, i.e., the stiffness, the damping, the under suspension mass of suspension system, and the radial stiffness, the radial damping of tire, is deduced based on the dynamic substructure modification method for structure-acoustic coupling analysis of an automobile＇s passenger compart- ment. Then, the validity of which is validated with a calculating example and the corresponding experiment.