汽车非线性悬架的混沌研究

A Chaos Research on Vehicle Nonlinear Suspension System

采用基于实测数据建立的非线性悬架模型,分析了汽车悬架中的非线性弹簧力和阻尼力,对非线性悬架系统的混沌运动进行了研究。在单频正弦路面、拟周期路面以及随机路面激励情况下,仿真计算得到了系统的响应。分析各激励下系统的相轨迹、庞加莱(Poincaré)截面、时间历程曲线、功率谱图及李亚谱诺夫(Lyapunov)指数图,结果表明非线性悬架系统中存在混沌现象。

Using the nonlinear suspension model based on measured data of a vehicle, the nonlinear spring load and damping force in vehicle suspension are analyzed and the chaotic movement of the nonlinear suspension system is studied. A simulation is conducted under the excitations of sine, quasi-periodical and random roads respectively, and the system responses are obtained. Based on these, the phase trace, Poincare section, time history, power spectrum plot and Lyapunov exponent curve of the system under different excitations are analyzed. The results reveal that the chaos phenomena occur in nonlinear suspension system.