基于质量守恒边界条件和微凸峰接触的动载轴承热弹性流体动力润滑特性∗

摘要

Based on mass⁃conservative boundary condition and Greenwood/Tripp asperity contact theory,the thermo⁃e⁃lastic⁃hydrodynamic mixed lubrication model of dynamically loaded journal bearings was built,which can predict the oil film,cavitations and contact simultaneously.Results show that,when considering the thermal effect, the deformation of the shell and the asperity contact are increased, the minimum oil film thickness is decreased and friction power loss is in⁃creased.Transient and local temperature of the oil film rises rapidly,especially for the bearing side.Increased input/output oil flows after considering the thermal effect implies that the bearing has certain self⁃adaptability to the temperature.The re⁃search result show that it is most important to consider the effect of both the temperature and the contact with mass⁃conser⁃vative boundary condition during the design of critical dynamically⁃loaded journal bearings.%基于质量守恒边界条件和Greenwood／Tripp微凸峰接触理论，建立动载滑动轴承的热弹性流体动力混合润滑模型，该润滑模型能够同时预测油膜、空穴、接触的共生现象。计算结果表明，计入温度影响后，轴瓦变形增加，微凸峰接触加重，最小油膜厚度降低，摩擦功耗增大；润滑油和轴瓦温度瞬时、局部增高明显，尤其在轴承端面。计入温度影响后，润滑油进／出口流量增加，表明轴承对温度具有一定的自适性。研究结果表明，在关键动载轴承的设计中基于质量守恒条件，同时计入接触和温度影响，是非常重要的。