摘要
滑动粗糙界面的摩擦润滑特性对界面的润滑设计和润滑状态预测具有重要的理论和实际意义。通过建立不同润滑状态下的滑动粗糙界面模型,基于界面的法向载荷由润滑油膜和粗糙体共同承担的载荷分配思想,采用Greenwood-Williamson统计模型描述粗糙表面形貌,考虑界面润滑的时变效应和润滑油的黏-压特性,建立线接触滑动粗糙界面的油膜厚度方程和粗糙体接触压力方程,获得了整个润滑区的润滑油膜载荷比例因子、油膜厚度和摩擦系数随滑动速度的变化关系,推导了界面由混合润滑过渡为液压润滑的临界速度关系表达式,分析了滑动粗糙界面的润滑承载机理,获得了界面油膜厚度、摩擦系数和临界速度随界面形貌参数、法向载荷、润滑油属性参数的变化规律,为机械结构的界面润滑设计、润滑状态预测和润滑优化提供理论和实验参考。
The dynamic friction lubriction characteristics of sliding rough interfaces are important to lubrication design and lubriation state prediction of mechanical structures. Here, the sliding rough interface models describing different lubrication states were established based on the load sharing concept that the total normal load was shared by lubrication oil film and rough body. The rough surface topography was described using the Greenwood-Williamson statistic model. The oil film thickness equation and the rough body＇s contact pressure equation on the lubricating interface were established considering the time-varying effect of interface lubrication and the lubrication oil＇s viscosity-pressure characteristic. The relationships between oil film load scaling factor, film thickness, friction coefficient and sliding velocity were obtained in the whole lubrication regions of boundary lubrication, mixed lubrication and elastohydrodynamic lubrication. The expression of the critical velocity at which the transition from mixed lubrication to elastohydrodynamic lubrication oecured was derived. The lubrication loading mechanism was analyzed and the change laws of oil film thickness, friction coefficient and critical velocity with respect to surface roughness, normal load and lubrication viscosity were obtained. The results provided theoretical and experimental guidances for interface lubration design, lubrication state prediction and lubrication optimization of mechanical structures.
出处
《振动与冲击》
EI
CSCD
北大核心
2016年第1期188-194,共7页
Journal of Vibration and Shock
基金
国家自然科学基金青年基金项目(51304019)
国家自然科学基金重点基金项目(51035008)
机械传动国家重点实验室开放基金项目(SKLMT-KFKT-201420)
关键词
滑动粗糙界面
动摩擦
润滑特性
临界速度
sliding rough interface
dynamic friction
lubrication characteristic
critical velocity
