随机路面激励下二自由度悬架性能仿真分析

Simulation analysis of 2-DOF suspension performance under random road excitation

弹性元件的刚度在车辆悬架系统中反映悬架的减振性能。以二自由度悬架模型为研究对象,探究刚度对悬架性能的影响。借助MATLAB/Simulink搭建二自由度车辆振动模型、滤波白噪声与简易脉冲信号结合的随机路面,探究不同悬架刚度下车身加速度、悬架动挠度及轮胎动载荷的变化规律。结果表明,悬架弹簧刚度越大车身振动越剧烈、振幅也越高;悬架动挠度随刚度增大而增加,轮胎动载荷随刚度增大而降低。为悬架系统的设计提供参考。

The stiffness of the elastic element reflects the damping performance of the suspension in the vehicle suspension system.Taking the two degree of freedom suspension model as the research object,the influence of different stiffness on suspension performance was explored.With the help of MATLAB/Simulink,a two degree of freedom vehicle vibration model was built and a random road surface combining filtered white noise and simple pulse signals was used to explore the variation laws of body acceleration,suspension dynamic deflection and tire dynamic load under different suspension stiffness.The greater the suspension spring stiffness,the stronger the body vibration and the higher the amplitude.The dynamic deflection of suspension increased with the increase of stiffness,and the dynamic load of tire decreased with the increase of stiffness.It provides reference for the design of suspension system.