Title
Structural health monitoring in changing operational conditions using tranmissibility measurements Structural health monitoring in changing operational conditions using tranmissibility measurements
Author
Faculty/Department
Faculty of Applied Engineering Sciences
Publication type
conferenceObject
Publication
New York :Wiley-Interscience ,
Subject
Engineering sciences. Technology
Source (journal)
Shock and vibration. - New York
Source (book)
International Conference on Structural Engineering Dynamics, June 22-24, 2009, Ericeira, Portugal
Volume/pages
17(2010) :4-5 , p. 651-675
ISSN
1070-9622
ISI
000280480200028
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Abstract
This article uses frequency domain transmissibility functions for detecting and locating damage in operational conditions. In recent articles numerical and experimental examples were presented and the possibility to use the transmissibility concept for damage detection seemed quite promising. In the work discussed so far, it was assumed that the operational conditions were constant, the structure was excited by a single input in a fixed location. Transmissibility functions, defined as a simple ratio between two measured responses, do depend on the amplitudes or locations of the operational forces. The current techniques fail in the case of changing operational conditions. A suitable operational damage detection method should however be able to detect damage in a very early stage even in the case of changing operational conditions. It will be demonstrated in this paper that, by using only a small frequency band around the resonance frequencies of the structure, the existing methods can still be used in a more robust way. The idea is based on the specific property that the transmissibility functions become independent of the loading condition in the system poles. A numerical and experimental validation will be given.
E-info
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