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Dynamic Response of a Hydrodynamic Thrust Bearing-Mounted Rotor

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

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

J. R. Chang

Nan-Jeon Institute of Technology, Tainan, Taiwan, R.O.C.

Paper No. GT2002-30314, pp. 795-801; 7 pages
doi:10.1115/GT2002-30314
From:
  • ASME Turbo Expo 2002: Power for Land, Sea, and Air
  • Volume 4: Turbo Expo 2002, Parts A and B
  • Amsterdam, The Netherlands, June 3–6, 2002
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-3609-6 | eISBN: 0-7918-3601-0
  • Copyright © 2002 by ASME

abstract

For investigating the dynamic response of a hydrodynamic thrust bearing-mounted flexible rotor, the dynamic characteristic data of thrust bearings for high surface velocities are applied for constructing the equation of motion for the rotor system, which is modeled with the finite element method (FEM). Based on the short bearing approximation and the π film cavitation model of the nonlinear oil-film forces, the dynamic responses are investigated using direct numerical integration with a variable order solver based on the numerical differentiation formulas (NDFs). Harmonic, quasi-periodic and chaotic motions are predicted for a range of spin speeds of the rotor. Poincaré maps of predicted rotor trajectories are also examined. It shows that spin speeds of the rotor and the oil film force coefficient might promote undesirable non-synchronous vibrations.

Copyright © 2002 by ASME

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