Damage detection of offshore wind power structures considering pile-soil interaction and scour

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (1) : 105-114.

LU Guangkun1, CHEN Xuguang1,2, DU Wenbo3, NIU Xiaodong1, LIU Jinzhong4, TANG Hanfeng1, LIU Xixi1, XIE Anqi1

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Abstract

Offshore wind turbine structures continually serve in atrocious ocean environment, and the damage continues to accumulate, leading to overall failure in severe cases. Existing damage detection methods can identify structural damage, but ignore the influence of pile-soil interaction and scour effect on the structural dynamic features. If it is directly applied to the actual project, it will easily cause misjudgment of damage. Based on the cross-model cross-mode method(CMCM method), considering the pile-soil interaction and scouring effect, the pile boundary conditions were optimized, and the CMCM structure damage detection method was developed. The pile-soil finite element model was established, combined with the existing test data, to verify the numerical model and detection method under the sand foundation. Furthermore, pile-soil interaction and scouring effect on the structural modal was studied, and the numerical model damage was detected based on the baseline model for different foundation assumptions. Results show that the foundation stiffness decreases after considering the pile-soil interaction and scouring effects, which leads to a decrease in the structure frequency and a change in the mode shape; The model boundary is more in line with the actual engineering foundation status; After the interference items are eliminated, the structural damage location and severity can be accurately identified, which improves the accuracy and engineering applicability of the CMCM method.
Key words: offshore wind turbine; damage detection; modal analysis; foundation; scour

Key words

offshore wind turbine / damage detection / modal analysis / foundation / scour

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LU Guangkun1, CHEN Xuguang1,2, DU Wenbo3, NIU Xiaodong1, LIU Jinzhong4, TANG Hanfeng1, LIU Xixi1, XIE Anqi1. Damage detection of offshore wind power structures considering pile-soil interaction and scour[J]. Journal of Vibration and Shock, 2023, 42(1): 105-114

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