In this paper, a seven-degree-of-freedom three-dimensional vibration model of a vehicle is established based on the parameters of a vehicle. Considering the hysteresis effect of pavement incentives of rear wheel, the random vibration of the vehicle is simulated by MATLAB / SIMULINK. After changing the stiffness, the acceleration of the vehicle body and the seat, suspension dynamic deflection and relative dynamic load are compared to select the suitable stiffness to achieve optimal ride performance. It can provide a reference for the one who is designing vehicle suspension.
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