STUDY ON IDENTIFICATION OF STRUCTURAL MODAL PARAMETERS FOR JACKET OFFSHORE WIND TURBINES

Gao Shan; Zhang Chen; Ren Xiudi; Lu Dongzhe; Wang Bin; Han Xu

doi:10.19912/j.0254-0096.tynxb.2024-0813

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (9) : 108-115. DOI: 10.19912/j.0254-0096.tynxb.2024-0813

STUDY ON IDENTIFICATION OF STRUCTURAL MODAL PARAMETERS FOR JACKET OFFSHORE WIND TURBINES

Gao Shan¹, Zhang Chen^2,3, Ren Xiudi¹, Lu Dongzhe², Wang Bin¹, Han Xu^2,3

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Abstract

A study on modal parameter identification of large jacket offshore wind turbine structures under operating conditions was carried out, and the robustness of the method under non-ideal white noise excitation conditions was investigated. Combined with hierarchical clustering algorithm, the covariance-driven stochastic subspace identification（COV-SSI） method was established to realize the automatic identification of modal parameters of wind turbine structures. The effectiveness and accuracy of the proposed identification method were firstly verified based on a numerical example of a three-story frame under stationary excitation. Then, based on scaled experiments of offshore wind turbine structure with a large jacket foundation, the accuracy and robustness of the modal identification method for offshore wind turbine under different wind and wave excitations were investigated. The results show that under rated wind speed, the method can effectively identify the first two natural frequencies and modal shapes of the structure with high accuracy.

Key words

offshore wind turbines / modal analysis / hierarchical clustering / stochastic subspace identification / jacket foundation

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Gao Shan, Zhang Chen, Ren Xiudi, Lu Dongzhe, Wang Bin, Han Xu. STUDY ON IDENTIFICATION OF STRUCTURAL MODAL PARAMETERS FOR JACKET OFFSHORE WIND TURBINES[J]. Acta Energiae Solaris Sinica. 2025, 46(9): 108-115 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0813

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