Modal Response 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), 525-533 (May 01, 1974) (9 pages) doi:10.1115/1.3438360 History: Received June 06, 1973; Online July 15, 2010


An analysis is presented for calculating the response of a general flexible rotor in fluid-film bearings to forced and transient excitation. It is a modal method where the governing system equations are transformed by means of normal coordinates into a set of decoupled, first-order equations which can be solved in closed form. The transformation is based on the orthogonal complex modal functions (“mode shapes”) associated with the eigenvalues of the system. The method has been applied to an industrial multistage compressor. Numerical results are given for the response to selected unbalance distributions and, also, the transient response to a shock pulse.

Copyright © 1974 by ASME
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