Journal
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
Volume 6, Issue 4, Pages 281-297Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/1475921707081970
Keywords
genetic algorithm; Hilbert-Huang transform; empirical mode decomposition; intrinsic mode function; damage detection
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A vibration-based approach to detect crack damage for large structural systems by using the Hilbert-Huang transform (HHT) has been proposed. The proposed method has been numerically implemented on a composite wingbox. In the implementation process, the following steps have been identified as being important: (a) An optimization procedure is developed by genetic algorithm (GA) in order to determine the location of piezoelectric sensor for damage detection in a composite wingbox; (b) To solve the end effect problem of empirical mode decomposition (EMD), axis-symmetry signal extension method is introduced; (c) Finally, a damage detection method by using HHT is developed. Furthermore, the effect of noise is considered. Examination of the results confirms that the identification method is very robust.
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