用多体动力学方法分析五连杆非独立后悬架的随动转向特性

摘要

对五连杆非独立后悬架随动转向特性的机理给出了直观的力学解释,并对后悬架的横向力进行分析；采用多体动力学ADAMS软件分别建立了后悬架的运动学和整车的动力学仿真模型,并进行了相应的仿真.结果表明:横向推力杆相对后轴的前、后位置基本确定了该类后悬架的随动过度转向特性和不足转向特性；两个斜置上拉杆的布置和衬套弯曲刚度对后悬架的随动转向特性有一定影响.实车试验验证了模型的正确性.%An intuitive mechanics explanation is given of the mechanism of compliance steering characteristics in a five-link dependent rear suspension and the lateral forces in rear suspension are analyzed. A kinematic model for rear suspension and a dynamic model for the vehicle are built respectively with multi-body dynamics software ADAMS, and the corresponding simulations are conducted. The results show that the horizontal location of Panhard rod relative to rear axle basically determines the behavior of steer; compliance over-steer or under-steer; the horizontal location of two inclined upper links relative to rear axle and the bending stiffness of link bushings have certain effects on the compliance steering characteristics of rear suspension. Finally the real vehicle test verifies the correctness of the models built.