轨道车辆车轮曲线磨耗特性的速度影响及预测分析

Speed Influence and Prediction Analysis on Wheel Curve Wear Characteristics of Railway Vehicles

为了提高对轨道车辆车轮磨耗特性预测效果,以某线的CRH6A车轮为例,建立磨耗动力学计算模型,分析速度对磨耗性能影响,给出车轮磨耗预测。研究结果表明:小半径运行曲线下,车辆经过曲线轮缘时与钢轨保持紧贴状态,总体保持较高程度的轮对磨耗,在车轮踏面上形成了最深的均分状态。当速度提高后,指标值发生了降低。大曲线半径时,轮轨冲角受到速度的明显影响,形成了更小轮轨冲角,轮缘和钢轨之间形成了更小的贴靠作用力,降低了轮对与轮缘的磨耗程度。磨耗分布与磨耗深度随速度增大而降低,以160 km/h比均衡速度更小的速度运行时,车轮产生了明显磨耗。

In order to improve the prediction effect of rail vehicle wheel wear characteristics,a CRH6A wheel of a certain line was taken as an example to establish a wear dynamics calculation model,with which the influence of speed on wear performance was analyzed and the wheel wear was predicted.The reserch results show that the vehicle keeps close to the rail when passing through the curviline rim with a small radius running curve and maintains a high degree of wheelset wear,forming a most homogeneous state on the wheel tread.As the speed increases,the index value decreases.When the curve radius is large,the wheel-rail angle of impact is obviously affected by the speed,forming smaller wheel-rail angle of impact and smaller adhesion force between the rim and rail,which reduces the wear degree of wheelset and rim.The wear distribution and wear depth decrease with the increase of the speed,and the wheel wears obviously when running at the speed of 160 km/h,a speed lower than equilibrium one.