RESEARCH PAPERS: Gas Turbines: Structures and Dynamics

Nonlinear Vibrations and Stability of a Rotor-Bearing System With Nonsymmetric Clearances

[+] Author and Article Information
R. Ganesan

Department of Mechanical Engineering, Concordia University, Montreal, Quebec, Canada H3G 1MB

J. Eng. Gas Turbines Power 119(2), 418-424 (Apr 01, 1997) (7 pages) doi:10.1115/1.2815591 History: Received November 28, 1996; Online November 19, 2007


The nonlinear vibrations of a rotordynamic system that is subjected to nonsymmetric bearing clearance effects are considered. Particular attention is paid to the nonstationary response that occurs during passage through resonance. Based on an extended Jeffcott rotor model that includes the effects of nonsymmetric bearing clearances, the steady-state oscillations and their stability are also analyzed. The “normal-loose” rotor stiffness condition that occurs due to the bearing clearance effects is modeled through a discontinuous radial stiffness model. Expressions for the amplitude and phase-modulating functions are obtained. Frequency-amplitude relationships are derived. The effects of “normal-loose” rotor stiffness condition on the modulation of both the amplitude and phase of the near-resonance vibrations, as well as the stability of the rotor system, are systematically brought out. The effects of high-speed acceleration during run-up of the rotor are both qualified and quantified. Similarly, the case of run-down is analyzed.

Copyright © 1997 by The American Society of Mechanical Engineers
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