This paper presents a new numerical model of wheel/rail in rolling contact to study the adhesion mechanism under the starved interfacial contaminations at high speed considering surface roughness. A thermal starved mixed elastohydrodynamic lubrication (EHL) theory is hired in the model. The empirical equations for analysing the contact force of rough surfaces that are based on amount of accurate finite element analysis (FEA) of an elastic‐plastic single‐asperity contact over a rigid flat are proposed. Multilevel method is used to solve the modified Reynolds equations, and sweeping column method is used to solve energy and heat conduction equations. The pressure field, the fractional film content, and the temperature field are obtained through the present model. In addition, the influences of train speed, surface roughness amplitudes, and inlet film thickness on the adhesion coefficient are investigated. The results from the present model have been compared with those from flooded analyses for water and oil‐contamination cases. The numerical results show that the inlet film thickness and the train speed had a significant effect on the wheel/rail adhesion ability.

中文翻译：

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缺乏表面粗糙度的界面污染物对高速轮/轨附着力的数值研究

本文提出了一种新的滚动接触的轮轨数值模型，以研究在考虑表面粗糙度的情况下在高速饥饿的界面污染物下的粘附机理。该模型采用了热饥饿混合弹性流体动力润滑（EHL）理论。提出了基于在刚性平面上的弹塑性单粗糙接触的精确有限元分析（FEA）量的分析粗糙表面接触力的经验方程。采用多级法求解修正的雷诺方程，采用扫列法求解能量和热传导方程。通过本模型可以得到压力场，分数膜含量和温度场。此外，火车速度，表面粗糙度幅度，并研究了进口膜厚度对附着系数的影响。本模型的结果已与水和油污染案例的淹没分析结果进行了比较。数值结果表明，进口膜厚度和列车速度对轮/轨附着力有显着影响。