Distinction between harmonic and structural components in ambient excitation tests using the time–frequency domain decomposition technique

The time–frequency domain decomposition technique has been proposed for modal identification in ambient vibration testing. In the presence of harmonic excitations, the modal identification process can provide not only structural modes but also non-structural ones relative to harmonic components. It...

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Bibliographic Details
Published in:Mechanical systems and signal processing 2015-02, Vol.52-53, p.29-45
Main Authors: Le, Thien-Phu, Argoul, Pierre
Format: Article
Language:English
Subjects:
Civil Engineering
Dynamique, vibrations
Engineering Sciences
Online Access:Get full text
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Summary:The time–frequency domain decomposition technique has been proposed for modal identification in ambient vibration testing. In the presence of harmonic excitations, the modal identification process can provide not only structural modes but also non-structural ones relative to harmonic components. It is thus important to distinguish between them. In this study, by using the time–frequency domain decomposition technique, it is demonstrated that the distinction between non-structural harmonic components and those of the structural responses can be possible, and it is merged into the general procedure of the time–frequency domain decomposition method. This proposition is then verified by numerical examples and by a laboratory test.
ISSN:0888-3270
1096-1216
DOI:10.1016/j.ymssp.2014.07.008