Stability and Damped Critical Speeds of a Flexible Rotor in Fluid-Film Bearings

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

Department of Machine Design, The Technical University of Denmark, Lyngby, Denmark

J. Eng. Ind 96(2), 509-517 (May 01, 1974) (9 pages) doi:10.1115/1.3438358 History: Received June 06, 1973; Online July 15, 2010


A method is described for calculating the threshold speed of instability and the damped critical speeds of a general flexible rotor in fluid-film journal bearings. It is analogous to the Myklestad-Prohl method for calculating critical speeds and is readily programmed for numerical computation. The rotor model can simulate any practical shaft geometry and support configuration. The bearings are represented by their linearized dynamic properties, also known as the stiffness and damping coefficients of the bearing, and the calculation includes hysteretic internal damping in the shaft and destabilizing aerodynamic forces. To demonstrate the application of the method, results are shown for an industrial, multistage compressor.

Copyright © 1974 by ASME
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