Issue |
Mechanics & Industry
Volume 14, Number 2, 2013
|
|
---|---|---|
Page(s) | 145 - 149 | |
DOI | https://doi.org/10.1051/meca/2013055 | |
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
Chocolaterie, BP
3410, 41034
Blois Cedex,
France
a Corresponding author:
guillaume.gautier@etu.univ-tours.fr
Received:
30
November
2012
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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