人-椅8自由度车辆系统的平顺性和稳定性研究

文中在Matlab/Simulink中搭建了人-椅8自由度车辆系统仿真模型,在仿真分析时考虑汽车前、后轮之间的延迟性,以路面随机信号作为输入激励,研究了汽车平顺性的时频特性,且分别通过4个轮胎的输入激励研究了汽车的稳定性.研究结果表明:路面输入为随机信号时,车身垂直加速度,车身俯仰角加速度,人-椅垂直加速度,前、后悬架...

Research on the Ride Comfort and Stability of a Human Chair with Eight Degrees of Freedom Automobile

A human chair eight degrees of freedom vehicle system simulation model was built in Matlab/Simulink;the delay between the front and rear wheels of the car in the simulation analysis was considered;random road signals were used as input excitation to study the time-frequency characteristics of vehicle ride comfort;and the stability of the vehicle was studied through four wheels input excitation.The research results show that when the road input is a random signal,the vertical acceleration,the pitch acceleration of the vehicle body,the vertical acceleration of the person-chair,and the front and rear wheel suspension deflection,and the front and rear tire dynamic load are all random signals,and the average value is close to 0.As the frequency increases,the amplitude-frequency and phase-frequency characteristics of the vertical acceleration,the pitch acceleration of the vehicle body,the vertical acceleration of the person-chair,the front and rear suspension deflection,and the front and rear tire dynamic load have significant difference under different wheel input excitation.There are also large differences in the system stability of the vehicle vertical acceleration,vehicle pitch acceleration,person-chair vertical acceleration,front and rear suspension deflection,and front and rear tire dynamic loads,under the excitation of different wheel inputs.