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On Two-Plane Balancing of Symmetric Rotors

[+] Author Affiliations
John J. Yu

GE Energy, Minden, NV

Paper No. GT2012-68061, pp. 485-495; 11 pages
doi:10.1115/GT2012-68061
From:
  • ASME Turbo Expo 2012: Turbine Technical Conference and Exposition
  • Volume 7: Structures and Dynamics, Parts A and B
  • Copenhagen, Denmark, June 11–15, 2012
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4473-1
  • Copyright © 2012 by ASME

abstract

When rotor balancing is performed in the field, minimum trial weight runs would significantly reduce the downtime in power generation and oil-gas industries. Typically two trial weight runs would be required in order to obtain both static and couple influence coefficients. The current paper demonstrates how both static and couple influence coefficients can be evaluated with high accuracy through merely one trial weight run on symmetric rotors. It is shown through real cases that, for symmetric rotors such as double-flow low-pressure (LP) turbine and generator rotors, cross effects between static weights (placed in-phase at two ends) and couple response (the same vibration amplitude but 180 degrees out-of-phase at two ends) are minimal and can be neglected. The same holds true for coupled weights (placed 180 degrees out-of-phase at two ends) and static response (the same vibration amplitude inphase at two ends). Real cases show that static and couple influence coefficients for symmetric rotors obtained from the one trial weight run are very close to the true values from the two trial weight runs or the classical static/couple approach. From the calculated static and couple influence data through one trial weight run, final balance weights for reducing static or couple response only or their combination can be determined successfully.

Copyright © 2012 by ASME
Topics: Rotors

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