紊流滑动轴承-转子系统的稳定性

Stability of rotor system supported by sliding bearing with turbulent effect

在轴承-转子系统中,由于转子尺寸的不断增大和线速度的不断提高,使得大部分轴承在紊流工况下运行。为分析轴承-转子动力学的稳定性,本文采用无限长滑动轴承模型假设,结合Sommerfeld变换,获得了紊流工况下非线性油膜力,建立了紊流滑动轴承支承的转子系统的动力学模型,运用Routh-Hurwitz判据分析了轴承-转子系统的稳定性,研究了紊流效应对紊流滑动轴承的刚度系数、阻尼系数、转子临界转速和在临界转速下转速频率比的影响。

The much more sliding bearings operate under the turbulent condition owing to an increase in the size and the linear velocity of the rotor in the bearing-rotor system.The analytical expression of nonlinear oil film forces of the turbulent sliding bearings is obtained by the Sommerfeld transformation under the infinitely long bearing assumption,and then a rotor system with the sliding bearings support is modeled.The stability of the bearing-rotor system is determined by Routh-Hurwitz criteria.The effect of turbulence on the stiffness coefficient,damping coefficient,the critical speed of the rotor and the whirl frequency ratio at the critical speed are investigated.