Stability and Bifurcation of Unbalanced Response of a Squeeze Film Damped Flexible Rotor

[+] Author and Article Information
J. Y. Zhao, I. W. Linnett

Department of Mechanical Engineering, Australian Defence Force Academy, Campbell, ACT 2600, Australia

L. J. McLean

A.E. Bishop & Associates Pty, Ltd., North Ryde, NSW 2113, Australia

J. Tribol 116(2), 361-368 (Apr 01, 1994) (8 pages) doi:10.1115/1.2927236 History: Received May 03, 1993; Revised June 20, 1993; Online June 05, 2008


The stability and bifurcation of the unbalance response of a squeeze film damper-mounted flexible rotor are investigated based on the assumption of an incompressible lubricant together with the short bearing approximation and the “π” film cavitation model. The unbalanced rotor response is determined by the trigonometric collocation method and the stability of these solutions is then investigated using the Floquet transition matrix method. Numerical examples are given for both concentric and eccentric damper operations. Jump phenomenon, subharmonic, and quasi-periodic vibrations are predicted for a range of bearing and unbalance parameters. The predicted jump phenomenon, subharmonic and quasi-periodic vibrations are further examined by using a numerical integration scheme to predict damper trajectories, calculate Poincaré maps and power spectra. It is concluded that the introduction of unpressurized squeeze film dampers may promote undesirable nonsynchronous vibrations.

Copyright © 1994 by The American Society of Mechanical Engineers
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