Damage detection of time-varying strutures based on synchrosqueezing wavelet transform#br#
LIU Jing-liang1 REN Wei-xin2 HUANG Wen-Jin1 HUANG Zhi-Wei1 XU Xu-Tang1
1. School of Transportation and Civil Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, China;
2. School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China
A new damage detection method of time-varying structures based on synchrosqueezing wavelet transform is proposed in this paper. The wavelet total energy index is first employed to detect damage locations, and then synchrosqueezing wavelet transform is performed on response signals at structural damage locations. As a result, the instantaneous frequencies are extracted and individual component signals are reconstructed. Then, the new time-varying damage index is defined based on the extracted instantaneous frequencies and modal participation factor ratio calculated from reconstructed individual components. A simply supported beam structure with abrupt and linear time-varying damage are simulated 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 damage.
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