Volume 23 Issue 2
Feb.  2008
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Article Navigation >  Journal of Aerospace Power  > 2008  >  23(2): 263-269
WANG Li-gang, CAO Deng-qing, WANG Jin-lin, HUANG Wen-hu, CUI Yin. Stability and bifurcation of elliptic bearing-rotor systems[J]. Journal of Aerospace Power, 2008, 23(2): 263-269.
Citation: WANG Li-gang, CAO Deng-qing, WANG Jin-lin, HUANG Wen-hu, CUI Yin. Stability and bifurcation of elliptic bearing-rotor systems[J]. Journal of Aerospace Power, 2008, 23(2): 263-269.
shu

Stability and bifurcation of elliptic bearing-rotor systems

  • 1.

    School of Astronautics, Harbin Institute of Technology, Harbin 150001, China

  • 2.

    School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

  • Received Date: 2007-01-29
  • Rev Recd Date: 2007-06-20
  • Publish Date: 2008-02-28
    Abstract
  • The nonlinear dynamic behavior of elliptic bearing-rotor system was investigated by working on 200 MWsteam turbine as an example.The finite element method was employed to establish a dynamical model of the system and a nonlinear model derived from the variational principle was adopted to describe the oil force of elliptic bearings.Then,the nonlinear dynamic system with 608-degree-of-freedom was reduced to a 30-degree-of-freeodm model in terms of the fixed interface mode synthesis method.The Rouge-Kutta method was employed to solve the reduced model numerically,and the frequency-response curve,the bifurcation diagram, and the three dimensional spectral plot obtained were used to analyze the stability of the rotor-bearing system.The effects,on the dynamic behavior of the system,of the eccentricity,the oil viscosity and the length-to-diameter ratio of bearing were discussed in terms of the frequency-response curve.The numerical results show that the stability range of the elliptic bearing-rotor model is larger than that of the circular bearing-rotor system.

     

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