摘要
运用数值算法研究了轮轨在油污染时的黏着特性。以部分弹流理论为基础借助于多重网格作为数值计算工具建立了二维轮轨在油污染状态下考虑表面粗糙度的轮轨黏着计算模型。研究了在有油污染情况下轮轨间接触压力分布以及列车运行速度和接触压力对轮轨黏着系数的影响。给出了轮轨介质接触时的固体承载及液体动压分布。计算结果表明:随着速度的提高,黏着系数逐渐降低,最后基本上趋于稳定;随着接触压力的增大,黏着系数逐渐增大。
A numerical method was used to study the characteristics of the adhesion between wheel and rail under oil contamination.A two-dimensional wheel/rail adhesion numerical model considering the surface roughness of wheel and rail under oil contamination was established based on the partial elastohydrodynamic lubrication（EHL） theory.A multigrid method was employed as a numerical tool in finding the characteristics of the adhesion by the proposed model.The contact pressure of the wheel and rail under oil contamination was analyzed.The effects of the train speed and wheel/rail contact pressure on the adhesion between wheel and rail were investigated.Through EHL analysis,the distributions of fluid dynamic pressure and the pressure carried by the solid roughness in the wheel/rail contact were obtained.The results show that the adhesion coefficient decreases and gradually approaches to a constant with the increase of train speed.It is also shown that the adhesion coefficient increases with the increase of wheel/rail contact pressure.
出处
《工程力学》
EI
CSCD
北大核心
2013年第4期392-396,416,共6页
Engineering Mechanics
基金
国家自然科学基金项目(U1134202
51175438)
国家重点基础研究发展计划项目(2011CB711103)
"十一五"国家科技支撑计划项目(2009BAG12A01-B04)
四川省应用基础研究项目(2011JY0087)
关键词
轮轨
油污染
黏着
表面粗糙度
数值计算
wheel and rail
oil contamination
adhesion
surface roughness
numerical method
