Structural damage identification of an offshore platform based on wavelet packet energy rate changing and model updating

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (6) : 212-223.

PANG Junheng,DONG Sheng

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Abstract

Accurate damage identification is an important guarantee for the safe operation of the offshore platform. Wavelet packet analysis can effectively reveal the partial feature of the signal, this paper proposes a sensitive to the damage of scheme selection principle of the wavelet packet decomposition, The wavelet packet energy change rate of acceleration signal before and after structural damage is taken as residual, the elastic modulus of the structure is taken as the parameter to be updated, a new objective function is constructed by sensitivity analysis for model updating and structural damage identification. Applying the above identification method to the simply supported beam model can accurately identify the existence, location and degree of damage, which verifies the feasibility of the method. The identification and analysis of the signal polluted by noise shows that the method has certain robustness, and the signal with serious noise pollution is denoised by wavelet threshold, the identification effect is improved compared with that before noise reduction. The method is applied to the offshore jacket platform model, and the damage scenario of different height and different type of member can be identified effectively, indicating that the method is also suitable for multi-storey complex structures.

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wavelet packet energy / model updating / sensitivity analysis / damage identification / Tikhonov regularization

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PANG Junheng,DONG Sheng. Structural damage identification of an offshore platform based on wavelet packet energy rate changing and model updating[J]. Journal of Vibration and Shock, 2023, 42(6): 212-223

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