Mechanics & Industry
Volume 14, Number 2, 2013
|Page(s)||145 - 149|
|Published online||12 June 2013|
Vibratory diagnosis by finite element model updating and operational modal analysis
ENI Val de Loire, Université François Rabelais de Tours, LMR
Laboratory, Rue de la
a Corresponding author:
Accepted: 11 April 2013
In this paper, a subspace fitting method is proposed to update, in the time domain, the finite element model of a rotating machine. The procedure is achieved by minimizing an error norm, leading to the comparison between experimental and theoretical observability matrices. Experimental observability matrix is obtained through a MOESP subspace identification algorithm, by projecting the output signal onto some appropriate subspaces, resulting in a cancellation of input excitations and noises. The theoretical observability matrix is obtained from modal parameters of a finite element model of the structure. The minimization procedure is carried out through a Gauss-Newton algorithm. The method is applied to determine the foundation stiffness of an experimental rotating machine subject to a random noise.
Key words: Subspace fitting / operational modal analysis / finite elements model updating / vibratory diagnosis / rotating machine
© AFM, EDP Sciences 2013
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