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Experimental Tests and Model Based Calculations for the Diagnosis of a Crack in 320 MW Generator

  • G. L. Lapini
  • M. Zippo
  • N. Bachschmid
  • A. Collina
  • A. Vallini
Conference paper
Part of the International Centre for Mechanical Sciences book series (CISM, volume 352)

Abstract

The paper reports the results of an extensive experimental test program for the diagnosis of a transverse crack in a generator rotor of a 320 MW steam power plant.

An adequate vibration monitoring equipment was installed on the machine in order to supply the items for the diagnosis of the malfunction.

The experimental dynamic behaviour of the rotor in-service and during the off-line tests in the factory was simulated by means of mathematical model of the rotor including the cracked effect: a satisfactory agreement was found with the experimental results.

The performed analysis strongly indicated the presence of a crack, which was later found by ultrasonic internal inspection.

Keywords

Harmonic Component Critical Speed Transverse Crack Ultrasonic Inspection Cooling Transient 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. [1]
    G. Diana, N. Bachschmid, F. Angeli “An on-line crack detection method for turbogenerator rotors” Int.Conf. on Rotordynamics, Tokyo, sept. 1986, pp. 385–390.Google Scholar
  2. [2]
    N. Bachschmid, D. Del Vescovo “Thermal bow in an axisymmetrical shaft containing a transverse notch and related vibrational behaviour” III Int. Conf. on Rotordynamics, Lyon, sept. 1990, pp. 239–244.Google Scholar
  3. [3]
    S. Ghia, A. Sala “Ultrasonic examination of large forging” Int.Conf.Materials for Power Engineering Components, Cost 501, Julich-Gerany, 13–14 oct.92.Google Scholar

Copyright information

© Springer-Verlag Wien 1994

Authors and Affiliations

  • G. L. Lapini
    • 1
  • M. Zippo
    • 1
  • N. Bachschmid
    • 2
  • A. Collina
    • 2
  • A. Vallini
    • 3
  1. 1.CISE SpASegrateItaly
  2. 2.Technical University of MilanMilanItaly
  3. 3.ENEL S.p.A. DPT-VDT-STEPisaItaly

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