汽车摆振动力学机理研究——位移延时反馈及能量传递分析

摘要

主要分析了汽车摆振的动力学机理.通过使用解析法从理论上证明了摆振是由位移延时反馈引起的自激振动现象.利用数值分析方法揭示摆振系统的动力学机制及响应行为,验证了解析分析的相关结论.并进一步计算能量输入与能量传递的值,结果表明能量输入可以用来评价汽车摆振的动力学响应.最后根据能量传递规律提出汽车摆振的抑制措施.%This paper analyzes the dynamic mechanism of vehicle shimmy.By using analytic method,it is theoretically proved that vehicle shimmy is a self-excited vibration phenomenon which is caused by displacement feedback with time delay.Moreover,numerical analysis is carried out to reveal the dynamic behavior and mechanism of the shimmy system,which verifies the conclusion of the analytical analysis.Then the energy input and energy transfer are calculated and the results indicate that the value of energy input can be used to evaluate the dynamic response of vehicle shimmy.Based on the analysis of energy transfer,some measures for attenuation of vehicle shimmy are presented at last.