摘要
以径向浮环动静压轴承为研究对象,采用有限元法和有限差分法联立求解Reynolds方程、能量方程和温黏关系式,得到内外层油膜的压力分布、温度分布和黏度分布,对油膜压力积分得到轴承的刚度系数和阻尼系数。针对轴颈、浮环建立统一的动力学方程,结合能量方程和Routh-Hurwitz准则推导出单质量刚性对称浮环轴承-转子系统的热失稳判据,分析了油膜热效应对内外膜最小油膜厚度与失稳转速的影响。结果表明:内外膜油腔呈现多个的温度峰值,两端面温度高于油腔中央温度;内外膜最小油膜厚度和系统失稳转速随着进油温度的升高而减小;高速工况下,油膜温升是导致浮环轴承发生油膜破裂和失稳现象的重要因素,计算时需计入油膜热效应对轴承性能的影响。
The finite element method and the finite difference method were combinedly used to solve the Reynolds equations,energy equations and temperature-viscosity equations for a journal floating ring bearing.The inner and outer fluid film pressure distribution,temperature distribution and viscosity distribution were calculated and the pressure was integrated to calculate the bearing stiffness and damping coefficients.The united dynamic equations were established for the shaft and floating ring,and the thermal instability criteria was derived for a single-mass rigid symmetric rotor system using energy equations and Routh-Hurwitz method.The results show that there are several temperature peaks in the inner and outer film pockets,and both ends temperature are higher than the pocket center temperature.The inner and outer minimum fluid film thickness and threshold speed fall rapidly while the inlet temperature is increasing.The lubricant temperature rise is an important factor causing the floating ring bearing fluid film to rupture and be instable,so the lubricant thermal effect should be considered in the bearing performance analysis.
作者
杨帅
郭红
张泽斌
YANG Shuai;GUO Hong;ZHANG Zebin(School of Mechanical and Power Engineering,Zhengzhou University,Zhengzhou 450001,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2020年第18期215-222,共8页
Journal of Vibration and Shock
基金
国家自然科学基金(51575498)。
关键词
径向浮环轴承
热效应
最小油膜厚度
失稳转速
journal floating ring bearing
thermal effect
minimum fluid film thickness
threshold speed
