RESEARCH PAPERS: Gas Turbines: Combustion and Fuels

Instability Threshold and Stability Boundaries of Rotor-Bearing Systems

[+] Author and Article Information
W. J. Chen

Centrifugal Compressor Division, Ingersoll-Rand Company, Mayfield, KY 42066

J. Eng. Gas Turbines Power 118(1), 115-121 (Jan 01, 1996) (7 pages) doi:10.1115/1.2816526 History: Received September 11, 1994; Online November 19, 2007


A direct numerical method for the determination of instability threshold and stability boundaries of flexible rotor-bearing systems is presented. The proposed procedure can also be used to improve the system stability by considering the design variables as operating parameters. The finite element method is utilized in the formulation of system equations of motion. The numerical algorithm is based on nonlinear optimization techniques. Two examples are presented to illustrate the feasibility, desirability, and ability of the proposed algorithm. A simple journal bearing system is used for the parametric study. An industrial high-speed compressor is employed to demonstrate the ability of this algorithm to deal with practical applications. The stability boundaries calculated from this algorithm are in agreement with the experimental results.

Copyright © 1996 by The American Society of Mechanical Engineers
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