Sensitivity of the Critical Speeds of a Rotor to Changes in the Design

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

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

J. Mech. Des 102(1), 115-121 (Jan 01, 1980) (7 pages) doi:10.1115/1.3254701 History: Received June 07, 1979; Online November 17, 2009


When designing a rotor it is frequently required to shift one or several critical speeds by making proper changes in rotor dimensions. This paper presents a scheme for computing the percentage change in critical speed as caused by a percentage change in any element of the rotor model. In this way it becomes possible to determine which elements are the most critical, and by how much they should be changed to effect the desired shift in critical speed. Such data also make it possible to adjust a given rotor model to bring it into agreement with measurements. The method can readily be incorporated into the conventional critical speed calculation and the additional computing time is insignificant.

Copyright © 1980 by ASME
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