减缓高速铁路钢轨波磨的仿真分析

Simulation Analysis on Mitigating Rail Corrugation for High Speed Railway

基于多体动力学软件NUCARS建立高速铁路车辆—轨道仿真模型,分析高速铁路车辆的簧下质量、一系悬挂垂向刚度和阻尼以及扣件的刚度和阻尼对高速铁路钢轨波磨磨耗指数的影响。结果表明:钢轨波磨磨耗指数随着簧下质量的增加而增加,高速铁路车辆一系悬挂垂向刚度和阻尼对钢轨磨耗指数的影响较小,但扣件的刚度和阻尼对钢轨波磨磨耗指数的影响非常显著,而且扣件阻尼越小,扣件刚度对钢轨波磨磨耗指数的影响越大,当扣件的阻尼由3kN·s·m-1增至9kN·s·m-1时,钢轨波磨磨耗指数急剧下降;因此,降低簧下质量和保持适当的扣件阻尼可有效延缓钢轨波磨的发展,控制线路纵向不平顺的形成。

The vehicle-track simulation model for high speed railway was built based on the multi-body dynamics software NUCARS to analyze the influence of the key parameters on the wear index of rail corrugation. The key parameters included unsuspended mass, the vertical stiffness and damping of primary suspension as well as the stiffness and damping of fastener. The results show that the wear index of rail corrugation increases with the increase of the unsuspended mass. The vertical stiffness and damping of the primary suspension has little influence on wear index. However, the stiffness and damping of fastener has significant influence on wear index. Moreover, the smaller is fastener damping, the greater is the influence of fastener stiffness on wear index. The wear index decreases sharply as the fastener damping increases from 3 to 9 kN· s· m-1. Accordingly, reducing unsuspended mass and keeping appropriate fastener damping can effectively delay the growth of rail corrugation and control the longitudinal irregularity of the track.