主销后倾角对独立悬架汽车自激摆振极限环特性的影响

摘要

考虑前轮定位参数应用拉格朗日方程建立了独立悬架汽车摆振系统4自由度模型.基于该模型,应用数值分析方法仿真分析了主销后倾角影响自激摆振中多极限环的速度区间及其数值特性.结果表明,随着后倾角增大,自激摆振中出现多极限环的速度区间提前,而且随着后倾角增大,不稳定极限环幅值减少,稳定极限环的幅值增大,但频率变化不大.研究结果为减小汽车自激摆振和多极限环现象控制提供了理论参考.%Considered the front alignment, a 4-DOF vehicle shimmy model with independent suspension was established by Lagrange equation. The numerical analysis for the speed range of multiple limit cycles and numerical characteristics was performed with respect to the change of the caster angle. It showed that the speed range of multiple limit cycles was advanced. The amplitude of unstable limit cycles was reduced. The amplitude of stable limit cycles was enlarged and the frequency didn' t change with increasing caster angle. The paper result was helpful to provide theoretical reference for reducing vehicle shimmy and controlling of multiple limit cycles.