曲线上轨距角润滑对轮轨非赫兹接触和钢轨表面疲劳损伤影响分析

Effect of gauge corner lubrication on wheel/rail non-Hertzian contact and rail surface damage on the curves

由于受到列车运营环境(轮轨黏着状态和车线耦合振动)的影响,轮轨系统动态相互作用呈现显著的非线性特征,其对轮轨表面磨耗和疲劳伤损的研究至关重要.在地铁曲线线路上,为缓解高轨轨距角异常磨耗,普遍安装了轨距角润滑装置.本文从数值仿真的角度,分析了在曲线上轨距角润滑对轮轨非赫兹接触和钢轨表面疲劳损伤的影响.基于车线耦合动力学理论,建立了地铁车辆-板式轨道三维耦合动力学模型,模型中考虑了一种精确的非赫兹轮轨滚动接触模型.分析了轨距角润滑对轮轨蠕滑、接触应力、黏-滑分布以及钢轨表面疲劳损伤的影响.数值研究表明,在曲线线路.上轨距角润滑对轮轨滚动接触影响显著;另-方面,轨距角润滑可显著降低轮轨摩擦系数,从而可进一步缓解钢轨表面疲劳损伤.

Wheel/rail rolling contact is a highly nonlinear issue affected by the complicated operating environment(including adhesion conditions and motion attitude of train and track system),which is a fundamental topic for further insight into wheel/rail tread wear and rolling contact fatigue(RCF).The rail gauge corner lubrication(RGCL)devices have been installed on the metro outer rail to mitigate its wear on the curved tracks.This paper presents an investigation into the influence ofRGCL on wheel/rail nonHertzian contact and rail surface RCF on the curves through numerical analysis.To this end,a metro vehicle-slab track interaction dynamics model is extended,in which an accurate wheel/rail non-Hertzian contact algorithm is implemented.The influence of RGCL on wheel/rail creep,contact stress and adhesion-slip distributions and fatigue damage of rail surface are evaluated.The simulation results show that RGCL can markedly affect wheel/rail contact on the tight curves.It is further suggested that RGCL can reduce rail surface RCF on tight curves through the wheel/rail low-friction interactions.