New Separation Techniques for Output-Only Modal AnalysisReport as inadecuate

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Shock and Vibration - Volume 11 2004, Issue 3-4, Pages 227-242

University of Technology of Compiègne, France

Politecnico di Torino, Italy

Received 24 August 2004; Revised 24 August 2004

Copyright © 2004 Hindawi Publishing Corporation. 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 paper is devoted to the problem of discriminating between operational and natural modes of structures excited by generic inputs. This case often occurs when the system under analysis holds rotating parts and is contemporary excited by ambient noise; in this case the output-only techniques may fail being easily trapped in a misinterpretation of the system eigenvalues. A survey of the methods available in literature is given, together with the explanation of their failures. To solve this problem, two new techniques are introduced and their capabilities are checked with numerical and experimental data from a paper machine.

Author: Jérôme Antoni, Luigi Garibaldi, Stefano Marchesiello, and Menad Sidhamed



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