【摘要】 基于油膜厚度方程、平均雷诺方程、能量方程和动力学方程，综合考虑启动时变工况、热效应、热弹性变形和粗糙度等因素，建立主轴承瞬态混合热弹流润滑分析模型．基于上述模型探究进油温度、半径间隙和启动时长对主轴承润滑特性参数(包括微凸体接触力、油膜厚度、油膜压力和温升分布)的影响规律，结果表明：针对所研究的低速柴油机主轴承，在启动工况下，适当降低进油温度可以减小微凸体接触力，缩短混合润滑时间；半径间隙在启动过程前期对润滑特性参数的影响几乎可以忽略，而在启动过程后期随着转速增加，其影响开始显现；缩短启动时长可一定程度上减小启动过程中的温升和微凸体接触力．更多还原

【Abstract】 A transient mixed thermal elastohydrodynamic(TEHD) lubrication analysis model of the main bearing of a low-speed diesel engine was established based on oil film thickness equations,average Reynolds equations,energy equations and dynamic equations. Time-varying working conditions,thermal and elastic deformation and roughness were considered in the model. Based on the model,the effects of oil inlet temperature,radius clearance and startup time on lubrication performances of the main bearing,including contact force,thickness and pressure of the oil film and temperature distribution,were analyzed. The results show that for the main bearing of the lowspeed diesel engine studied,the contact force is reduced and the time of mixed lubrication is shortened by reducing the oil inlet temperature during startup. The influence of radial clearance on lubrication characteristic parameters can be almost ignored in the early stage of startup process. Shortening the starting time can reduce the temperature rise and contact force to a certain extent.更多还原