Damage Detection Method of Structures Based on Relative Variation of Wavelet Total Energy

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (14) : 38-44.

XIANG Yi-qiang1,2, JIA Ya-kun1

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Abstract

The damage of bridge will intensify with the increase of service life, so it confronts the bridge engineer with searching for the appropriate damage detection method. After applying discrete wavelet transform to dynamic response signal at the measuring point, wavelet total energy can be calculated. Setting the intact structure as the reference state, the detection method based on the relative variation of wavelet total energy is proposed. A case study of a beam (fixed at two ends) is conducted to apply the damage detection method. A finite element model of the beam is established to verify the detection result. We can conclude that: The proposed damage index can accurately determine the existence and location of the damage and it is sensitive to damage; What’s more, it also show robustness to noise, wavelet type and decomposition scale; The damage detection method can tackle with acceleration, velocity and displacement signal to assess the damage. So the proposed detection method can be applied for the damage detection of bridge structure.

Key words

bridge structures / discrete wavelet transform / wavelet total energy / damage index / detection

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XIANG Yi-qiang1,2, JIA Ya-kun1. Damage Detection Method of Structures Based on Relative Variation of Wavelet Total Energy[J]. Journal of Vibration and Shock, 2017, 36(14): 38-44

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