基于高斯粗糙表面的角接触球轴承微弹流润滑研究

Research on Micro-Elastohydrodynamic Lubrication of Angular Contact Ball Bearings Based on Gaussian Rough Surface

基于二维数字滤波法模拟高斯粗糙表面,建立考虑高斯粗糙表面形貌及热效应的角接触球轴承微弹流润滑模型,采用多重网格积分法求解弹性变形,采用Gauss-Seidel及Jacobi迭代法迭代求解压力,采用逐步扫描法求解油膜能量方程,采用渐进网格加密法求解强耦合非线性微弹流润滑方程组。结果表明:当x、y方向自相关长度相同时,随着粗糙表面均方根值的增加,油膜压力及温度明显增加,膜厚显著减小;反之,油膜压力及膜厚在自相关长度较小的方向出现明显的纹理特性,且当纹理特性与润滑油流动方向相同时,油膜温度显著减小。

Gaussian rough surface is simulated,based on two-dimensional digital filtering method.The micro-elastohydrodynamic lubrication model of angular contact ball bearing is established according to the morphology of Gaussian rough surface and thermal effect.The multi-grid integration method is used for solving the elastic deformation.The Gauss-Seidel and Jacobi Iterative method are used for solving the pressure.The oil film energy equation is solved by stepwise scanning method.The progressive meshing method is used for solving the micro-elastohydrodynamic lubrication equations for strongly coupled nonlinear.The results show that,when the autocorrelation length are equal in x,y direction,the oil film pressure and temperature increase obviously and the film thickness decreases significantly with the increase of the mean square root value of the rough surface.On the contrary,the oil film pressure and film thickness have obvious texture characteristics in the direction of the small autocorrelation length.The oil film temperature decreases significantly when the texture characteristic is the same as the flow direction of the lubricating oil.