A Modal Transient Simulation Model for Flexible Asymmetric Rotors

[+] Author and Article Information
D. W. Childs

Mechanical Engineering and Engineering Management, Speed Scientific School, University of Louisville, Louisville, Ky.

J. Eng. Ind 98(1), 312-319 (Feb 01, 1976) (8 pages) doi:10.1115/1.3438840 History: Received May 23, 1975; Online July 15, 2010


A simulation model is developed which accounts for an orthotropic as opposed to an axisymmetric rotor, i.e., rotors are considered whose stiffness and inertial properties in two mutually orthogonal planes are different. A rotor-fixed formulation is employed to define the rotor’s elastic deflections. Favorable characteristics of this formulation are that (a) the rotor’s inertial and stiffness properties are constant, and (b) the modal coordinates are nonoscillatory during synchronous motion. The validity of the formulation is verified by conducting transient simulations for a rotor having the approximate physical dimensions of a two-pole 500 MW alternator. The simulation model correctly simulates the rotor’s theoretically predicted dynamic behavior.

Copyright © 1976 by ASME
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