基于小孔节流的液体动静压球轴承动态特性分析  

ANALYSIS OF DYNAMIC CHARACTERISTICS OF SPHERICAL HYBRID SLIDING BEARINGS BASED ON ORIFICE THROTTLING

作　　者：陈雨飞 沈景凤[1] 周羿好 CHEN YuFei;SHEN JingFeng;ZHOU YiHao(College of Mechanical Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学机械工程学院,上海200093

出　　处：《机械强度》2023年第4期939-947,共9页Journal of Mechanical Strength

基　　金：上海市扬帆计划项目(19YF1434500)资助。

摘　　要：以小孔节流方式的液体动静压球轴承为研究对象,建立球轴承的润滑数学模型,推导出层流状态下的Reynolds方程,引入流量守恒原理并结合小孔节流器的流量计算得到油腔和封油边压力分布;采用微扰法推导出扰动压力控制方程,通过有限差分法和松弛迭代法求解扰动压力控制方程得到轴承的刚度和阻尼系数。运用数值分析研究供油压力、转速及油膜间隙等参数对轴承动态特性系数的影响。结果表明,随着油膜间隙减小,供油压力的增大,刚度和阻尼系数会随之增大;随着转速增大,直接刚度变化趋势较小,直接阻尼降低趋势较明显;当油膜间隙为20μm时,轴承刚度和阻尼系数达到最大;转速的提高对于刚度影响较小,而阻尼系数则会明显降低。Taking the spherical sliding bearings with orifice throttling as the research object,the mathematical model of lubrication of spherical hybrid sliding bearings is established and the Reynolds equation under laminar flow state is deduced from this model.The pressure distribution of the oil chamber and oil edge are calculated according to the flow conservation principle of the orifice throttle.Combining with the finite difference method and relaxation iterative method to solve the disturbance pressure control equation which is derived by means of perturbation method.The stiffness coefficient and damping coefficient of spherical sliding bearings are used to study the influence of supply pressure,rotating speed,average oil film clearance and other parameters on the dynamic characteristics coefficient of the bearing through numerical analysis.The results show that as the oil film clearance decreases and the oil supply pressure increases,the stiffness coefficient and damping coefficient will increase accordingly.As the rotating speed increases,the changing trend of the direct stiffness is small while the decreasing trend of the direct damping is obvious.When the oil film clearance is 20μm,the stiffness coefficient and damping coefficient of spherical hybrid sliding bearings reach the maximum.The increasing of rotating speed has little effect on the stiffness while the damping coefficient will be significantly reduced.

关 键 词：小孔节流 液体动静压球轴承 流量守恒原理 雷诺方程 微扰法 动态特性 

分 类 号：TH133.36[机械工程—机械制造及自动化]