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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
  • 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


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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