柔性轮对结构振动对车辆动力学性能的影响

为研究轮对柔性对车辆动力学的影响,建立高速列车轮对的有限元模型,对轮对进行自由模态分析.通过模态综合法获取柔性轮对模态信息,应用多体系统动力学理论建立柔性轮对-刚性轨道接触力学模型;建立包含高速旋转柔性轮对的车辆-轨道耦合动力学模型,研究高速列车在直线和曲线通过时轮对结构振动对车辆动力学性能的影响.结果表明:轮对的结构振动对轮轨接触点位置、蠕滑率、蠕滑力和脱轨因数等均产生较明显的影响,但是对轮重减载率影响较小,因此应采用更加精确的柔性轮轨耦合模型研究轮轨相互作用、轮轨滚动接触疲劳和轮轨噪声等.

Institute of Railway and Urban Rail Transit, Tongji University

To study the effect of wheelset flexibility on vehicle dynamics, a finite element model of high speed train wheelset is built and its free mode is analyzed. The modal information is obtained by modal synthesis method. The contact mechanics model of flexible wheelset vs rigid rail is built according to multi body system dynamics theory. Based on the vehicle rail coupling dynamics model with high speed rotation flexibility wheelset, the effect of wheelset structure vibration on vehicle dynamics performance is studied when high speed train is running on straight line or curve rail. The results show that the wheelset structure vibration makes an obvious effect on the position of wheel rail contact point, creep rate, creep force and derailment factor, except wheel unloading rate. The more accurate flexible wheelset rail coupling model should be employed to research the wheel rail interaction, wheel rail rolling contact fatigue and wheel rail noise.