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Bifurcation of Nonlinear Hydrodynamic Thrust Bearing-Mounted Rotor Subjected to Parametric Excitations With Unbalance

[+] Author Affiliations
T. N. Shiau, K. S. Hsu

National Chung Cheng University, Chia Yi, Taiwan, R.O.C.

J. R. Chang

Far East College, Tainan, Taiwan, R.O.C.

Paper No. GT2003-38641, pp. 561-567; 7 pages
doi:10.1115/GT2003-38641
From:
  • ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference
  • Volume 4: Turbo Expo 2003
  • Atlanta, Georgia, USA, June 16–19, 2003
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-3687-8 | eISBN: 0-7918-3671-1
  • Copyright © 2003 by ASME

abstract

The purpose of this study is to investigate the dynamics of a nonlinear hydrodynamic thrust bearing-mounted rigid rotor subjected to an unbalance force and parametric excitations. The parametric excitations include hydrodynamic forces and momenta of the thrust bearing when the rotor is subjected to an axial harmonic excitation. The effect of an eccentric axial excitation is also considered and the associated equations of motion are derived. Nonlinear phenomena including periodic response, hysteresis cycle, chaotic motion, etc. are investigated. The bifurcation values of parametric and unbalance excitation for steady state response are determined. The solutions of lateral response are dominated by the magnitude and frequency of axial excitation under light unbalance. The results show that the effect of axial excitation on bifurcation phenomenon of lateral vibration is significant as the eccentricity of axial force is enlarged.

Copyright © 2003 by ASME

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