Damage detection for time-varying strutures based on the synchrosqueezing wavelet transform
A new damage detection method for time-varying structures based on the synchrosqueezing wavelet transform was proposed.The wavelet total energy index was employed to detect damage locations,and then the synchrosqueezing wavelet transform was performed on,the response signals at the structural damage locations.As a result,the instantaneous frequencies were extracted and individual component signals were reconstructed.A new time-varying damage index(TVDI) was defined based on the extracted instantaneous frequencies and modal participation factor ratio calculated from the reconstructed individual components.A simply supported beam structure with abrupt and linear timevarying damage was simulated numerically to verify the effectiveness of the presented method.The results demonstrate that the defined time-varying damage index can effectively detect damage locations and track structural time-varying damages.
synchrosqueezing wavelet transforminstantaneous frequencymodal participation factor ratiotime-varying damage detectionwavelet total energy
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维普
