高速轮轨粗糙表面法向和切向接触刚度研究  

Study on Normal and Tangential Contact Stiffness of Rough Surface between High Speed Wheel/Rail

作　　者：肖乾 方姣[1] 

机构地区：[1]华东交通大学载运工具与装备教育部重点实验室,江西南昌330013 [2]西南交通大学牵引动力国家重点实验室,四川成都610031

出　　处：《润滑与密封》2018年第2期31-35,共5页Lubrication Engineering

基　　金：国家自然科学基金项目(51565013);牵引动力国家重点实验室开放课题(TPL1407)

摘　　要：为准确计算高速轮轨粗糙表面法向和切向接触刚度,基于W-M函数分形理论建立高速轮轨表面粗糙度三维数值模型;分析轮轨法向和切向接触刚度理论,运用有限元法离散轮轨接触面建立轮轨粗糙表面接触有限元简化模型;基于罚函数的面-面接触算法定义轮轨接触,加载位移载荷计算轮轨法向和切向接触刚度。计算结果表明:接触载荷作用下考虑轮轨表面粗糙度可更为准确地计算法向和切向接触刚度;轮轨法向接触刚度受法向载荷影响较大,且随着法向载荷的增加而增加,而摩擦因数对法向接触刚度的影响甚微;轮轨切向接触刚度随着法向载荷和摩擦因数的增加而增加,随着切向载荷的增加而减小。In order to accurately calculate the normal and tangential contact stiffness of rough surface between high speed wheel/rail, a three-dimensional numerical model of high speed wheel/rail surface roughness was established based on W-M function fractal theory.The wheel/rail normal and tangential contact stiffness theory was analyzed, and the finite element method was used to discrete the wheel/rail contact surface for establishing the simplified contact finite element model of the wheel rail rough surface.The penalty function of face to face contact algorithm was used to the wheel/rail con- tact, and the displacement load was applied to calculate wheel/rail normal and tangential contact stiffness.The results show that the normal and tangential contact stiffness can be calculated more accurately when considering the surface roughness of wheel/rail under contact load.The normal contact stiffness of wheel/rail is greatly affected by normal load, and which is in- creased with the increasing of normal load, while the friction coefficient has little effect on the normal contact stiffness.The tangential contact stiffness is increased with the increasing of normal load and friction coefficient, and decreased with the increasing of shear load.

关 键 词：高速列车 轮轨关系 粗糙表面 法向接触刚度 切向接触刚度 

分 类 号：TH117[机械工程—机械设计及理论]