基于瞬态接触特性的科隆蛋扣件轨道波磨形成机理

Mechanism of corrugation on the track with Cologne egg fasteners based on transient contact characteristics

为从轮轨瞬态接触黏滑振动角度探究地铁线路上钢轨波磨的形成机理,该文首先根据现场波磨情况建立了三维轮轨滚动接触有限元模型并论证其有效性;然后,分析了车轮运行过程中的接触黏滑状态,并讨论了轮轨接触黏滑特性与波磨生成的关系;最后,研究了轮轨系统固有特性和钢轨纵向磨耗特征。结果表明:凹坑缺陷改变了轮轨滚动接触黏滑分布,导致轮轨界面发生滑移并诱发轮轨系统失稳,且滑移会进一步引起钢轨磨耗,以致最终可能形成波磨。综合轮轨接触黏滑特性和复模态分析的结果,可将钢轨波磨的形成机理归为轨面缺陷激励引发的轮轨系统的固有不稳定振动,且该不稳定振动表现为钢轨相对于轨道板的垂向弯曲振动。当车轮经过凹坑缺陷时,会产生瞬态纵向波动磨耗,且磨耗的特征波长为40~50 mm,这与实测线路上的波磨波长情况相符,从而进一步验证了钢轨波磨的形成机理。

[Objective]Rail corrugation is a problem that needs to be addressed urgently and is one of the common technical issues limiting the development of contemporary rail transit.This study uses the finite element method to analyze the formation process of rail corrugation from the wheel-rail transient contact stick-slip vibration to provide new insights into the mechanism of rail corrugation and to understand the phenomenon of rail corrugation on the metro line.[Methods]This study examines the formation mechanism of rail corrugation using field measurements and numerical simulation.First,according to the on-site corrugation situation,a three-dimensional wheel-rail rolling contact model is developed using the finite element software ABAQUS,and its effectiveness is established.The contact stick-slip state is then analyzed during the wheel operation,and the influence of the rail surface and no rail surface defect on it is discussed.Furthermore,the relationship between stick-slip characteristics and corrugation formation is examined.Finally,the inherent characteristics of the wheel-track system and longitudinal wear characteristics of rail are analyzed using the complex modal theory and the Archard wear model to explain the formation mechanism of rail corrugation.[Results]The results revealed that when the wheel rolled over the smooth rail,the adhesion area was at the front edge of the contact area,and the middle and rear edges were the slip area,which was closer to the steady state dynamic calculation results,verifying that the established finite element model was effective.Moreover,the wheel-rail contact was always in a stable rolling state,indicating that the wheel-track system was not easily unstable,consequently making corrugation generation difficult.When the wheel rolled through the squat defect,the contact area was shown as two slip areas surrounding the squat;after the wheel rolled through the squat defect,the area of the wheel-rail contact patch decreased,and almost all of it showed slip.The squat defect changed the stick-slip state of wheel-rail rolling contact and promoted the slip of the wheel-rail interface,which induced the instability of the wheel-track system and caused the wear of the rail surface material;this might eventually form rail corrugation.The complex modal analysis showed that the rail surface defect exacerbated the inherent unstable vibration characteristics of the wheel-track system,and the unstable vibration frequencies fell within the measured corrugation passing frequency range.[Conclusions]The analysis results of wheel-rail contact stick-slip and complex modal reveal that the formation mechanism of rail corrugation can be attributed to the inherent unstable vibration of the wheel-track system caused by the excitation of the rail surface defect,and the unstable vibration is represented by the vertical bending vibration of the rail relative to the track slab.Thus,when the wheel passes through the squat defect,it will stimulate the transient fluctuation wear,which results in wavy wear on the rail surface.The characteristic wavelength of the longitudinal wear on the rail surface is 40~50 mm,which is consistent with the corrugation wavelength on the actual line;thus,the formation mechanism of rail corrugation is further validated in the process of quantifying rail corrugation formation.