MODEL TEST ON TAUT MOORING FORCE CHARACTERISTICS OF TETRAPOD BUCKET FOUNDATION FOR OFFSHORE WIND TURBINE

Liu Xianqing; Ding Yu; Zhang Puyang; Zhang Yu; Hu Shenghong; Yang Bo

doi:10.19912/j.0254-0096.tynxb.2024-1941

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (3) : 275-281. DOI: 10.19912/j.0254-0096.tynxb.2024-1941

MODEL TEST ON TAUT MOORING FORCE CHARACTERISTICS OF TETRAPOD BUCKET FOUNDATION FOR OFFSHORE WIND TURBINE

Liu Xianqing¹, Ding Yu¹, Zhang Puyang², Zhang Yu³, Hu Shenghong¹, Yang Bo¹

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Abstract

Addressing the requirements for low-cost, lightweight, and large-scale development of floating offshore wind turbines （FOWTs）, a taut-moored FOWT foundation form based on the air-floatation characteristics of tetrapod bucket foundations is proposed. The mooring force characteristics and internal pressure variations of the foundation are directly related to the structural safety and stability. This paper presents an analysis of the effects of pre-tension, water depth-to-draft ratio, and anchoring distance on the response amplitude operator （RAO） of mooring line tension and internal pressure variations within the foundation through small-scale wave model tests of tetrapod bucket foundations with taut mooring. The research findings indicate that the changes in mooring line tension and internal air pressure exhibit similar patterns, with the RAO of the front mooring line tension showing smaller variations compared to the rear lines. As pre-tension increases and draft deepens, the RAO of mooring line tension initially decreases and then increases. A excessively small water depth-to-draft ratio for this structure leads to increased mooring line tension, whereas the structural performance is superior in deeper waters. When slow-drift motions dominate, increasing the anchoring distance to a certain extent can improve the mooring force characteristics of the structure.

Key words

offshore wind turbines / bucket foundation / taut mooring / force characteristics / pre-tension / depth-to-draft ratio / anchoring distance

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Liu Xianqing, Ding Yu, Zhang Puyang, Zhang Yu, Hu Shenghong, Yang Bo. MODEL TEST ON TAUT MOORING FORCE CHARACTERISTICS OF TETRAPOD BUCKET FOUNDATION FOR OFFSHORE WIND TURBINE[J]. Acta Energiae Solaris Sinica. 2026, 47(3): 275-281 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1941

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