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International Journal of Rotating Machinery
Volume 6, Issue 4, Pages 301-312

Bifurcation Behavior of a Flexible Rotor Supported on Nonlinear Squeeze Film Dampers without Centralized Springs

1Department of Electrical Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China
2lnstitute of Mechanics, Department of Mechanical Engineering, University of Essen, Essen 45127, Germany
3Center of Vibration Engineering, Department of Mechanical Engineering, Imperial College, Exhibition Road, London SW7 2BX, UK

Received 17 September 1997; Revised 17 November 1998

Copyright © 2000 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


In this paper, the bifurcation behavior of a flexible rotor supported on nonlinear squeeze film dampers without centralized springs is analyzed numerically by means of rotor trajectories, Poincar maps, bifurcation diagrams and power spectra, based on the short bearing and cavitated film assumptions. It is shown that there also exist two different operations (i.e., socalled bistable operations) in some speed regions in the rotor system supported on the nonlinear squeeze film dampers without centralized springs. In the bistable operation speed regions, the rotor system exhibits synchronous, sub-synchronous, sub-super-synchronous and almost-periodic as well as nonperiodic motions. The periodic bifurcation behaviors of the rotor system supported on nonlinear squeeze film dampers without centralized springs are very complex and require further investigations.