动态有限长线接触弹流润滑分析

摘要

Considering variation in the load,the isothermal elastohydrodynamic lubrication (EHL) of finite line contacts was analyzed,and a complete numerical solution was obtained based on multi-grid and multi-integration method.Effect of the load,squeeze-film and separation actions was discussed.Results show that,the pressure and film thickness are mainly governed by the squeeze-film and separation actions.A sudden load increase can lead to an increase in the pressure and significant development of the squeeze-film actions.Consequently the lubricant film thickness is decreased,and the contact area is increased.The minimum film thickness appears in modification profile area at the roller ends during the load variation.Variation in film thickness lags behind the variation in load,and increasing time periods of load can weaken the lags.%考虑载荷的变化,研究等温条件下有限长线接触弹流润滑问题,采用多重网格法和多重网格积分法求得完全数值解,讨论载荷变化的影响及挤压运动与分离运动的作用.结果表明:压力和膜厚的大小主要由油膜的挤压运动和分离运动控制,载荷突然增加导致压力增大,挤压运动增强,因此膜厚减小,接触区域增大；载荷变化过程中,最小膜厚出现在滚子端部的修形区域；膜厚变化滞后于载荷变化,载荷脉冲周期增大能够减弱这种滞后性.