说明：  在simulink中建立了四自由度汽车被动悬架模型，此模型能被用来仿真汽车的乘坐舒适性。在路面白噪声的输入下，可以求出悬架的动挠度等。
(The establishment of a four DOF passive suspension model in simulink, and can be used to simulate the car s comfort. Road white noise input is the output is suspension dynamic deflection, etc.)