全浮式浮环轴承-转子系统动态特性与稳定性研究

Research on Dynamic Characteristics and Stability of Fully Floating Ring Bearing-Rotor System

基于内外油膜的刚度和阻尼系数分析方法,探讨全浮式浮环轴承-转子系统的动态特性和稳定性;对轴承-转子系统进行线性和非线性仿真分析。分析表明:当系统转速超过12000 r/min时,系统进入不稳定状态,出现不稳定涡动;系统转速达到15000 r/min,浮环转速比为0.54时,系统处于不稳定状态。研究还表明:可通过轴承设计将系统中的不稳定低频涡动控制在工程应用的允许范围内;为增强系统的稳定性,浮环半径比和浮环外内间隙比尽量取大值。

Based on the analysis method of stiffness and damping coefficient of internal and external oil film,the dynamic characteristics and stability of fully floating ring bearing-rotor system were discussed.The linear and nonlinear simulation analysis of bearing-rotor system was carried out.The analysis shows that when the speed of the system exceeds 12000 r/min,the system gets into an unstable state and unstable whirl occurs;when the system speed reaches 15000 r/min and the floating ring speed ratio is 0.54,the system is in an unstable state.The research also shows that the unstable low-frequency whirl in the system can be controlled within the allowable range of engineering application through bearing design.In order to enhance the stability of the system,the radius of the floating ring and the outer and inner clearance ratio of the floating ring shall be set as large as possible.