汽车振动合理的力学模型为多输入型,且各个输入之间存在有一定程度的相关性。对这种多输入系统,只能使用多重相干和偏相干函数分析方法,才能正确地给出全部输入与输出之间的因果关系,并定量地给出某个(或某几个)输入对输出的贡献。文中以一辆四轮汽车为例,分析了它在道路上行驶时的振动情况. The reasonable mechanical model of vehicle vibration is multi-input type, and there is a certain degree of correlation between each input. For such a multi-input system, only the methods of multiple coherence and partial coherence functions can be used in order to give a correct causal relationship between all inputs and outputs and to give a quantitative estimate of one (or a few) pairs of outputs Contributions. Taking a four-wheeled vehicle as an example, this paper analyzes the vibration of the four-wheeled vehicle when it is driving on the road.