Int. J. Simul. Multidisci. Des. Optim.
Volume 2, Number 4, December 2008
|Page(s)||267 - 272|
|Published online||27 February 2009|
Parameter Identification of Bladed Assemblies Using a Subspace Method
Institute FEMTO-ST; UMR-CNRS 6174-Department LMARC, 25000, Besancon, France
Accepted: 17 August 2008
This paper is aimed at identifying a dynamical model for bladed assemblies such as turbines. Unknown excitation forces are applied to bladed disk assemblies leading to forced vibration responses. Non contact measurement of such vibrations using tip-timing has become an industrial standard procedure and current research focuses on analysis methods for interpretation of measured vibrations. Our purpose is to develop a subspace method for the identification of blade's natural frequencies, damping ratios and mode shapes using blade tip-timing data. The importance of the developed procedure results in the fact that in a narrow band frequency, less than 2 Hz, twenty two modes can be easily identified. A detailed description of this method and results are presented.
Key words: Modal parameters / Subspace method / Bladed disk assemblies / Aliasing / Signal reconstruction
© ASMDO, 2008
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