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Abstract

This paper explores the advantages of Variational Mode Decomposition (VMD) in detecting local damage on beam type structures (bridge) subjected to a sprung mass (vehicle). VMD is used to decompose the acceleration time history of the bridge at its midspan into its constitutive intrinsic mode functions (IMFs). The instantaneous frequency (IF) and instantaneous amplitude (IA) of the first IMF show irregularities at the damage position. We demonstrate through computer simulation that VMD is superior for detecting damage when compared to the well-known Empirical Mode Decomposition (EMD) method. A new damage sensitive feature (DSF) is also introduced that considers synchronisation of peaks between the IA and IF signals. The results show that the new DSF can enhance the peak at the damage positions while suppressing peaks at other locations.

Item Type:	Article
Authors/Creators:	Mousavi, M and Holloway, D and Olivier, JC and Gandomi, AH
Keywords:	change detection, structural damage detection, vehicle bridge interaction, variational mode decomposition, moving mass, vibration, damage detection, SHM of bridge, empirical mode decomposition
Journal or Publication Title:	Measurement
Publisher:	Elsevier Sci Ltd
ISSN:	0263-2241
DOI / ID Number:	https://doi.org/10.1016/j.measurement.2020.108297
Copyright Information:	Copyright 2020 Elsevier
Related URLs:	Google Scholar: Holloway, D UTAS Profile: Holloway, D UTAS Profile: Olivier, JC
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