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Vibratory diagnosis by finite element model updating and operational modal analysis

Published online by Cambridge University Press:  12 June 2013

G. Gautier ,
R. Serra  and
J.-M. Mencik
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Abstract

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.

Keywords

Subspace fittingoperational modal analysisfinite elements model updatingvibratory diagnosisrotating machine
Type
Research Article
Information
Mechanics & Industry , Volume 14 , Issue 2 , 2013 , pp. 145 - 149
Copyright
© AFM, EDP Sciences 2013

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