油介质下轮轨粘着特性数值分析-研究生论坛

基于二维滚动接触理论和部分弹流理论,建立了微凸体接触情况下的稳态部分弹流数值模型,运用多重网格法对油介质工况下的轮轨黏着特性进行数值仿真研究。利用所建立的数值仿真模型研究了轮轨接触压力分布情况,分析了滚动速度、载荷、轮轨表面粗糙度等参数对轮轨黏着特性的影响。结果表明:油介质条件下轮轨接触区的宽度比干态下要宽,是干态下接触区宽度的1.5倍左右;油介质下的轮轨黏着系数明显小于干态下的黏着系数;轮轨黏着系数随着速度的增加逐渐减小,随接触压力的增加而降低,随轮轨表面粗糙度的增加而增大。

Numerical analysis on adhesion property of wheel/rail under oil condition

A numerical model of steady partial EHL lubrication was established under the asperity contact condition based on two dimensional rolling contact theory and partial elasto hydrodynamic lubrication theory. The adhesion property of wheel/rail under oil condition was investigated in detail using the numerical model and multigrid method. The distribution of contact pressure of wheel/rail was analyzed using the numerical model. Furthermore, the effects of rolling speed, load and surface roughness on the adhesion property of wheel/rail were investigated in detail. The results indicated that the width of contact area of wheel/rail under oil condition is lager than that under dry condition (about 1.5 times). The adhesion coefficient of wheel/rail under oil condition is smaller than that under dry condition. The adhesion coefficient decreased as the rolling speed increasing. With the increases of contact pressure, the adhesion coefficient decreased. When the surface roughness of wheel/rail was increasing, the adhesion coefficient of wheel/rail would increase obviously.