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A Subspace Method for Modal Identification of Bladed Assemblies Using Blade Tip-Timing Data

[+] Author Affiliations
Bendali Salhi, Marc Berthillier, Joseph Lardies

FEMTO-ST Institute, Besançon, France

Philippe Voinis, Charles Bodel

Electricité de France, Clamart, France

Paper No. GT2007-28151, pp. 839-848; 10 pages
doi:10.1115/GT2007-28151
From:
  • ASME Turbo Expo 2007: Power for Land, Sea, and Air
  • Volume 1: Turbo Expo 2007
  • Montreal, Canada, May 14–17, 2007
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4790-X | eISBN: 0-7918-3796-3
  • Copyright © 2007 by ASME

abstract

Unknown excitation forces are applied to bladed disk assemblies, such as turbines blades, leading to forced vibration responses. Non contact measurement of such vibrations using blade tip-timing data has become an industrial standard procedure and current research focuses on analysis methods for interpretation of measured vibrations. Our purpose is to develop a method for identification of the blade’s natural frequencies and damping ratios using blade tip-timing data. The method is based on a subspace analysis. Its performance is compared to the traditional Fast Fourier Transform analysis. A detailed description of these methods and results are presented.

Copyright © 2007 by ASME
Topics: Blades

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