Quality Factors of Rotors With Hydrodynamic Bearings

[+] Author and Article Information
J. S. Rao

Indian Institute of Technology, New Delhi 110016 India

J. Eng. Gas Turbines Power 115(2), 261-265 (Apr 01, 1993) (5 pages) doi:10.1115/1.2906703 History: Received July 13, 1990; Online April 24, 2008


The quality factor of a system is a measure of the maximum amplitude of vibration that occurs at resonance when the frequency of excitation is equal to the undamped natural frequency. This factor can be easily determined for a given mode of vibration, given its equivalent viscous damping ratio, as Q = 1/2ξ. Such a definition becomes complicated for a rotor mounted on hydrodynamic bearings. This note discusses some factors involved in estimating the quality factor of a rotor.

Copyright © 1993 by The American Society of Mechanical Engineers
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