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International Journal of Rotating Machinery
Volume 2007 (2007), Article ID 17289, 10 pages
Review Article

Mistuning Identification and Model Updating of an Industrial Blisk

1Laboratoire de Tribologie et Dynamique des Systèmes, Équipe Dynamique des Structures et des Systèmes, École Centrale de Lyon, 36 avenue Guy de Collongue, Ecully Cedex 69134, France
2Snecma (Safran group), Moissy-Cramayel 77550, France

Received 16 February 2006; Revised 6 December 2006; Accepted 6 December 2006

Academic Editor: Agnes Muszynska

Copyright © 2007 D. Laxalde et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The results of a complete study of mistuning identification on an industrial blisk are presented. The identification method used here is based on a model-updating technique of a reduced order. This reduced-order model is built using component mode synthesis, and mistuning is introduced as perturbations of the cantilevered-blade modes. The measured modal data are extracted from global measurements of the blisk's forced response. As we use a single point excitation, this measurement procedure allows the acquisition of all the modes of a given family with a quite simple experimental set-up. A selection of the best identified modal data is finally performed. During the mistuning identification procedure, these measured data are regularized using an eigenvector assignment technique which reduces the influence of eventual measurement errors. An inverse problem, based on the perturbed (mistuned) modal equation, is defined with measured modes as input and mistuning parameters as unknown. Then, the reduced-order model is updated with the identified mistuning, we first perform a correlation on modal responses (using eigenfrequency deviation criteria and MACs). Finally, correlation results on forced responses are presented and discussed.