影响轮轨粘滑振动的主要参数分析

Analysis of the Main Influencial Parameters over Wheel/Rail Stick-slip Vibration

轨道交通轮轨间的粘滑振动是小半径曲线轨道上发生波磨的主要原因。通过建立具有扭转和弯曲自由度的单轮对仿真模型来研究轮轨间两个主要参数对于抑制粘滑振动、减缓波磨形成的影响。降低Kalker系数后,线路圆曲线段没有出现粘滑振动,蠕滑力-蠕滑率关系曲线的饱和点也移向更高的蠕滑率值;内外轮轨摩擦系数同时降低后,抑制了粘滑振动,但轮轨间仍处于滑动状态,当内外轨摩擦系数降低值不一致时,线路曲线段的粘滑振动仍然存在,但峰峰值将有所减小。

Stick-slip vibration is considered as the key cause of the rail corrugation on small radius curves. By modeling a single wheel-set model which contains bending degree of freedom and torsional degree of freedom, the effects of two key parameters on inhibiting stick-slip vibration and on slowing the formation of rail corrugation are studied. There will be no stick-slip vibration on the circular curves following the reduction of Kalker coefficient, because the saturation point of the creep forcecreepage relationship curve moves to the higher value of the creepage. On the other hand, when the values of both outer and inner friction coefficients are reduced at the same time, the stick-slip vibration will disappear and the wheel/rail contact will be in the slip condition. On the condition that the values are reduced at the same time, the stick-slip vibration exists but the peak to peak value of creepage will decrease.