摘要
以Carter二维滚滚接触理论和粗糙面间的稳态部分弹流理论为基础,在考虑轮轨接触表面有相对滑动情况下,应用数值分析方法对水介质条件下轮轨黏着特性进行研究,研究滚动速度、轴重对黏着的影响。研究发现:在水介质条件下,轮轨接触区的区域要比干接触时大,流体动压入口约在Hertz接触半宽的2倍处;相同轴重条件下,随着滚动速度增大,流体动压力值增大,而相应的微凸峰接触压力值减小,导致其与总压力的比值减小,引起轮轨之间的黏着系数下降;相同速度条件下,随着轴重的增大,微凸峰接触压力与总压力的比值增大,引起轮轨之间的黏着系数增大。
Based on the theory of Carter＇s two dhnensional rolling contact anct the rough surface steady partial elastohydrodynamic lubrication theory, by considering sliding of wheel/rail contact area, the effect of rolling speed and axle load on the adhesion property under water condition between wheel and rail was investigated with numerical analysis method. The results indicate that the wheel/rail contact area under water conditions is bigger than that under dry conditions, the inlet of fluid dynamic pressure is at the point of twice half of Hertz contact length. When under the same axle load, with the increase of rolling speed, the fluid dynamic pressure increases, the asperity contact pressure decreases, which causes the ratio of asperity contact pressure and total pressure of wheel/rail contact area decreasing, and causes the adhesion coefficient decreasing. When under the same rolling speed, with the increase of axle load, the ratio of asperity contact pressure and total pressure becomes bigger, which causes the adhesion coefficient increasing.
出处
《润滑与密封》
CAS
CSCD
北大核心
2010年第10期42-45,72,共5页
Lubrication Engineering
基金
国家自然科学基金项目(50905148)
国家973计划资助项目(2007CB714702)
国家重点实验室自主研究课题(2008TPL-Z09)
关键词
黏着特性
部分弹流
水介质
滚动速度
轴重
adhesion property
partial elasto-hydrodynamic lubrication
water condition
rolling speed
axle load
