海水润滑塑料轴承的微观热弹流润滑分析

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The elastohydrodynamic lubrication（EHL） of a plastic bearing was studied by considering the thermal effect and the bearing surface transverse roughness.A full numerical solution to the problem of thermal micro-elastohydrodynamic lubrication of plastic bearing was obtained by using the multi-grid method for pressure,the multi-integration method for deformation and the column scanning method for temperature rise.The effects of surface roughness wave,the load and the speed on the pressure and the film thickness were discussed.Numerical results reveal that the existence of bearing surface roughness has certain effect on the pressure and the film thickness and its existence makes film pressure and film thickness oscillating.The load and speed has tiny influences on film pressure distribution,but the film thickness is increased greatly with the increase of speed or the decrease of load.考虑轴承表面海水润滑膜温度场和轴承表面横向粗糙度等因素,对塑料轴承的弹流润滑问题进行了研究。利用压力求解的多重网格法和弹性变形求解的多重网格积分法以及温度求解的逐列扫描技术,得到塑料轴承微观热弹流润滑问题的完全数值解,讨论了连续波状粗糙度、载荷、轴承转速对海水润滑膜压力及膜厚的影响。数值计算结果表明：轴承表面粗糙度对润滑膜压力和膜厚分布都有一定影响,连续波状粗糙度使润滑膜压力和膜厚分布产生振荡;转速和载荷对压力分布影响较小,随转速的增大、载荷的减小,膜厚都有明显的增大。