Abstract: The chaos characteristics of automobile suspension under quasi-impulse excitation were studied by numerical simulation and experiment. The 2D model of automobile suspension was built, which was subjected to the quasi-impulse excitation. The time history curve, power spectrum, phase trace and maximum Lyapunov exponent were given out by numerical simulation. It was confirmed that the automobile suspension vibration was chaotic. The vibration acceleration curve of automobile suspension was obtained by triangle wood experiment. The characteristics curves of suspension vibration were calculated and analyzed by using Matlab, and power spectrum and phase trace were obtained. And then the maximum Lyapunov exponent was calculated. The chaos characteristics of automobile suspension vibration were verified.

Key words: vibration and wave, suspension, chaos, simulation, experiment

摘要： 通过数值仿真和实验，研究拟脉冲激励下汽车悬架振动的混沌特性。建立拟脉冲激励下的2自由度汽车悬架模型，通过数值仿真，给出悬架振动的时间历程曲线、功率谱图、相轨迹和最大Lyapunov指数，从理论上说明汽车悬架振动是混沌的。采用三角木法进行振动实验，获取汽车悬架的振动加速度曲线图；通过Matlab对悬架振动的特性曲线进行计算分析，获得悬架振动的功率谱图和相轨迹，并对其计算最大Lyapunov指数，从而验证汽车悬架振动的混沌特征。

关键词: 振动与波, 悬架, 混沌, 仿真, 实验