Parameter Sensitivity in the Dynamics of Rotor-Bearing Systems

[+] Author and Article Information
M. Rajan, H. D. Nelson, W. J. Chen

Mechanical and Aerospace Engineering, Arizona State University, Tempe, AZ 85287

J. Vib., Acoust., Stress, and Reliab 108(2), 197-206 (Apr 01, 1986) (10 pages) doi:10.1115/1.3269324 History: Received June 11, 1985; Online November 23, 2009


When designing a rotor system it is frequently desirable to have at hand a set of design sensitivity coefficients which quantitatively predict a change in specific system characteristics to changes in design parameters. This paper presents eigenvalue sensitivity coefficients for the damped natural frequencies of whirl of general linear rotor system modelled by finite element discretization. In addition, a simple and direct method for calculation of the damped critical speeds is presented, which utilizes the eigenvalue sensitivity with respect to the spin speed. It is shown that the combination of design parameter and spin speed whirl frequency sensitivity coefficients may be used to also evaulate the damped critical speed sensitivity coefficients.

Copyright © 1986 by ASME
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