Journal
MEASUREMENT
Volume 168, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.measurement.2020.108297
Keywords
Vehicle bridge interaction; Variational mode decomposition; Moving mass; Vibration; Damage detection; SHM of bridge; Empirical mode decomposition
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This paper explores the advantages of using Variational Mode Decomposition (VMD) in detecting local damage on beam type structures subjected to a sprung mass. By introducing a new damage sensitive feature (DSF), it enhances peaks at the damage positions while suppressing peaks at other locations, demonstrating superior performance compared to the well-known Empirical Mode Decomposition (EMD) method.
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 (IMEs). 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.
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