减速带激励下非线性汽车悬架系统动力学特性研究
首发时间:2012-06-20
摘要:连续减速带(SCHs)作为高速公路上一种特殊的道路安全设施,对遏制交通事故的发生发挥了重要作用。本文通过构建呈周期变化的减速带近似模型和非线性2自由度1/4车辆悬架模型,分析系统的分岔图、相位图、poincaré截面图和功率谱图,得到了车辆系统产生混沌现象的频率条件和其与速度之间的关系。研究结果表明:在连续减速带路面的激励下,车辆有发生混沌振动的可能性。
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ANALYSIS OF CHAOTIC VIBRATION OF A NONLINEAR SUSPENSION MODEL CAUSED BY THE SCHs
Abstract:The consecutive speed control humps (SCHs) play an important role in inhibiting traffic accident caused by over-speeding of vehicle. In the paper, an approximated model description of the consecutive SCHs as an excitation from the road surface is presented. The chaotic vibration of the vehicle with nonlinear damper and nonlinear spring are studied by analysis bifurcation diagram, phase portrait, poincaré map and power spectrum when passing over the consecutive SCHs. Frequency condition resulted in chaos is given, and the relationship among the speed, the parameters of the consecutive SCHs and chaotic response is established. Numerical results show that the chaotic vibration would occur in vehicle excited by consecutive SCHs.
Keywords: consecutive SCHs nonlinear suspension system chaotic vibration bifurcatiion
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