浮环轴承系统中浮动环作用机理研究

Research of mechanism of a floating ring in the floating ring bearing system

研究了浮环轴承系统中浮动环的作用机理。基于Hirs整体流动理论和Moody壁面摩擦系数方程,从广义不可压Reynolds方程出发,建立考虑外层油膜剪切效应及浮动环弹性变形的浮环轴承系统的新的三维动力学模型,并推导了该模型的微分方程。通过数值算例分析,证明浮动环能较大幅度地降低由大不平衡量引起的油膜刚度和阻尼的高度非线性。随着偏心率的增大,挤压油膜系统的最大正油膜压力出现的位置向气穴油膜系统的正负压区交界处移动。

In this paper,the mechanism of a floating ring in the floating ring bearing system is investigated. Based on Hirs＇ bulk flow theory, Moody＇ frication factor equation and generalized incompressible Reynolds Equation, considering the shearing effect of the outer squeeze film and the elastic deformation of the floating ring, the model and the governing equation of the floating ring bearing were set up. The result of a numerical example showed that the new model can effectually reduce the strong non-linearity of the oil film rigidity and damp originated by large unbalance. As the increasing of the eccentricity, the location where the absolute value of the press of oil film is largest moved to the turning point between the plus and minus press regions in an oil film system with cavitations.