Improvement of Stability of Rotor System by Introducing a Hydraulic Damper into an Active JournalBearing

[摘要] Modelling and analysis of a rotor--bearing system with a new type of active oil bearing ispresented. The active bearing is supplied with a flexible sleeve whose deformation can bechanged during operation of the rotor. The flexible sleeve is also a part of a hydraulic damperwhose parameters can be controlled during operation as well.Finite Element Method (FEM) and the Guyan condensation technique was utilised tocreate mathematical model of both, the rotor and the flexible sleeve. The hydrodynamicpressure distribution in the oil film, for the instantaneous position of the flexible sleeve androtor, was approximated by Reynolds equation.The mathematical model of motion of a rotor system with the described active bearingdeveloped in this paper allowed the influence of the introduced hydraulic damper on stabilityof the rotor-bearing system to be investigated. Results of the computer simulation shows thatwithin a large region of configuration parameters of the rotor bearing system, the self excitingvibration can be eliminated or greatly reduced during operation by properly controlleddeformation of the flexible sleeve and optimal choice of the hydraulic damper parameters.

[学科分类] 力学，机械学