CONSIDERATION METHOD OF FOUNDATION DAMPING IN INTEGRATED TIME-DOMAIN ANALYSIS OF OFFSHORE WIND TURBINES

Ji Weidong; Qi Tao; Yan Ruiyang; Li Rongfu; Guo Peng; Zhang Youhu

doi:10.19912/j.0254-0096.tynxb.2025-0607

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (10) : 774-782. DOI: 10.19912/j.0254-0096.tynxb.2025-0607

CONSIDERATION METHOD OF FOUNDATION DAMPING IN INTEGRATED TIME-DOMAIN ANALYSIS OF OFFSHORE WIND TURBINES

Ji Weidong¹, Qi Tao¹, Yan Ruiyang¹, Li Rongfu¹, Guo Peng², Zhang Youhu²

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Abstract

This paper proposes an improved centralized damping method： applying a damping matrix at the equivalent rotational center of the monopile. The equivalent rotational center serves as a "decoupling point" for the monopile foundation, addressing the coupling issue in the stiffness matrix at the mudline that complicates rotational damping coefficient calculations based on apparent rotational stiffness. First, the formulas for calculating the damping ratio of the pile-soil interaction system and the position of the equivalent rotational center are derived. Then, this improved method is incorporated into the integrated time-domain analysis of offshore wind turbines by developing the SoilDyn module in OpenFAST. Finally, the validity of the improved centralized damping method is verified by comparing it with distributed damping results under the same load conditions.

Key words

offshore wind turbines / large diameter monopile / foundation damping / time-domain analysis

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Ji Weidong, Qi Tao, Yan Ruiyang, Li Rongfu, Guo Peng, Zhang Youhu. CONSIDERATION METHOD OF FOUNDATION DAMPING IN INTEGRATED TIME-DOMAIN ANALYSIS OF OFFSHORE WIND TURBINES[J]. Acta Energiae Solaris Sinica. 2025, 46(10): 774-782 https://doi.org/10.19912/j.0254-0096.tynxb.2025-0607

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