摘要
联立求解广义雷诺方程、油膜瞬态三维能量方程、轴瓦瞬态三维固体热传导方程及轴颈的运动方程,并考虑粘度和密度随温度及压力的变化,在油膜与轴瓦界面使用热流连续性边界条件,确定了在承受稳态载荷时圆轴承在启动过程中的温度变化情况.介绍了一种有效的用于求解轴承瞬态性能的改进Newton-Raphson算法.结果表明:整个系统达到热平衡的时间与启动加速度的大小无关;启动加速度越高,温度升高越快;在启动过程中,油膜最高温度出现的位置沿膜厚方向而变化.同有关试验结果的对比证实所建模型和所用算法正确可行.
The simultaneous solution of the generalized Reynolds equation, transient three-dimensional energy equation of the oil film, transient three-dimensional heat transfer equation of the bush, and the motion equation of the journal was realized by taking into account the variation of the oil viscosity and density with temperature and pressure. And the variation of the temperature of the plain journal bearing during the start-up was determined based on the hypothesis of the heat flux continuity condition at the interface between the oil film and the bush. An improved Newton-Raphson method was introduced to analyse the transient performance of the bearing and found to be efficient. The model and the approach were verified and found to be feasible for the analysis of the transient thermal effect of the journal bearing, based on the comparison with the reported relevant experimental results. The time for the whole bearing system to reach thermal equilibrium was independent of the acceleration. During the start-up, the larger the acceleration was, the more significant the temperature rise was, while the maximum temperature position varied along the film-depth direction.
出处
《摩擦学学报》
EI
CAS
CSCD
北大核心
2003年第2期136-140,共5页
Tribology
基金
国家自然科学基金重大项目资助(19990510).
