大间隙环流中轴承支承的单质量转子系统特征值分析

建立了大间隙环流中动压滑动轴承支承的单质量转子系统运动方程和特征方程，分析了系统参数对特征值的影响。结果表明，动压滑动轴承特性系数（如刚度和阻尼系数）、大间隙环流特性参数（如流体动力质量、壁面摩擦因数和无量纲间隙比）以及单质量转子系统参数（如系统固有频率）对系统特征值有不同程度的影响。结果表明：随着表征轴承刚度特性的ω1的增大，失稳转速增加，最终γ趋近于2，即相当于Jeffcott转子系统，同时临界转速也随之提高；随着表征轴承阻尼特性ζ的增大，失稳转速不变，临界转速提高；随着表征大间隙环流特性的流体动力质量α的增大，失稳转速不变，临界转速下降；随着表征大间隙环流特性的壁面摩擦因数和无量纲间隙比值β的增大，失稳转速和临界转速均不发生变化：随着表征单质量转子特性的固有频率ω0的增大．失稳转速下降．临界转速降低．

Eigenvalue Analysis of a Mono-mass Rotor Supported by Hydrodynamic Lubrication Bearing with Large Gap Annular Flow

The motion equations and eigen-equation of system of mono-mass rotor supported by hydrodynamic lubrication bearing with large gap annular flow were derived, and the effects of the system parameters on eigenvalues were analyzed. Results show that the unstable speed of system rises and gets to a constant in the end, and the critical speed rises with increase of stiffness of hydrodynamic lubrication bearing; the unstable speed does not change and the critical speed rises with increase of damping of hydrodynamic lubrication bearing; the unstable speed does not change and the critical speed decreases with increase of the Stocks hydrodynamic mass of large gap annular flow; both unstable speed and critical speed do not change with increase of wall roughness and dimensionless gap depth of large gap annular flow;both unstable speed and critical speed decrease with increase of natural frequency of mono-mass rotor system.