Modal Balancing of a Multi-Mass Flexible Rotor Without Trial Weights PUBLIC ACCESS

[+] Author Affiliations
A. B. Palazzolo, E. J. Gunter

University of Virginia, Charlottesville, VA

Paper No. 82-GT-267, pp. V005T13A016; 11 pages
  • ASME 1982 International Gas Turbine Conference and Exhibit
  • Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; Process Industries; Technology Resources; General
  • London, England, April 18–22, 1982
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7960-3
  • Copyright © 1982 by ASME


In this paper, a procedure is presented to determine the unbalance distribution in a multi-mass flexible rotor system without requiring that trial weights be placed upon the shaft to first determine the influence coefficient matrix of the various balance planes. A modified Nyquist plotting procedure is presented to generate a polar plot of proximity probe measurements for determination of the 90-deg phase shift position of the modal eccentricity. By knowing the rotor modal mass and mode shape, a modal balancing distribution can be calculated. This relationship provides a quick procedure in estimating a first mode balance correction weight in both magnitude and angular location. An application is presented for a steam turbine during the startup of a hydrogen gas compression train. Higher order modal unbalance corrections are shown to be calculable in a similar manner.

Copyright © 1982 by ASME
Topics: Rotors
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