Mistuning Identification and Model Updating of an Industrial Blisk

Laxalde, D.; Thouverez, F.; Sinou, J.-J.; Lombard, J.-P.; Baumhauer, S.

doi:https://doi.org/10.1155/2007/17289

International Journal of Rotating Machinery

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Review Article | Open Access

Volume 2007 | Article ID 017289 | https://doi.org/10.1155/2007/17289

Mistuning Identification and Model Updating of an Industrial Blisk

D. Laxalde,^1,2F. Thouverez,¹J.-J. Sinou,¹J.-P. Lombard,²and S. Baumhauer²

Academic Editor: Agnes Muszynska

Received16 Feb 2006

Revised06 Dec 2006

Accepted06 Dec 2006

Published07 Feb 2007

Abstract

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.

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Copyright

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.

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