考虑不同轮轨耦合作用的高速列车动力学响应分析

Dynamic Response Analysis of High-speed Train Running Considering Different Wheel-rail Coupling

基于多体系统动力学理论,利用多体动力学软件建立了某型高速车辆系统动力学模型,对比分析了不同轮轨耦合作用下车辆系统的振动响应,计算得到了两种轮对的非线性临界速度,并合理选取了六种典型线路工况,研究了不同轮轨耦合作用对车辆系统动力学性能的影响.结果表明:轮对弹性变形使车辆系统的非线性临界速度降低,并降低了车辆系统与无质量轨、移动质量轨耦合下的脱轨系数、轮轨横向力和轮轴横向力等动力学指标,但与柔性轨道耦合时,上述动力学指标却升高;当车辆系统与无质量轨耦合时,轮对弹性变形使车体Sperling平稳性指数在横向上最大增幅为5.3%,而在垂向上最大增幅仅为0.7%.

Based on the theory of multi-body system dynamics,the dynamic model of a high-speed train is established by using multi-body dynamics software.The vibration response of vehicle system under different wheel-rail coupling is compared and analyzed.The nonlinear critical velocity of two wheel-set is obtained.Six circuit conditions are selected to study the influence of different wheel-rail coupling on the dynamic performance of vehicle system.The results show that the nonlinear critical velocity of the vehicle system has been reduced by elastic deformation of wheel pairs reduces,and the derailment coefficient,the lateral force of wheel and rail,the lateral force of wheel and axle are reduced as well.But when coupled with the flexible rail,the above dynamic index increases.When the vehicle system is coupled with the massless rail,the elastic deformation of the wheel-set makes the vehicle Sperling index increase to a maximum of 5.3%laterally and only 0.7%vertically.