STUDY ON CALCULATION METHOD OF NATURAL VIBRATION PERIOD OF COMPOSITE BUCKET FOUNDATION FOR OFFSHORE WIND TURBINES

Liu Xianqing; Li Wenlong; Ding Yu; Zhang Puyang; Zhang Yu; Hu Shenghong

doi:10.19912/j.0254-0096.tynxb.2024-0741

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (9) : 51-57. DOI: 10.19912/j.0254-0096.tynxb.2024-0741

STUDY ON CALCULATION METHOD OF NATURAL VIBRATION PERIOD OF COMPOSITE BUCKET FOUNDATION FOR OFFSHORE WIND TURBINES

Liu Xianqing¹, Li Wenlong¹, Ding Yu¹, Zhang Puyang², Zhang Yu³, Hu Shenghong¹

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Abstract

The composite bucket foundation is a commonly used type of foundation in the development of offshore wind power. Accurately evaluating its natural vibration period is crucial for the successful implementation of construction techniques such as air-floating towing, sinking, and floating. This paper derives a formula for calculating the natural vibration period of the composite cylinder foundation, taking into account the mechanism of air-floating, structural dynamics theory, and the coupling effect of the air cushion and water plug inside the bucket. The validity and accuracy of this calculation method are confirmed by comparing it to experimental and calculated values from existing literature. The results demonstrate that by considering the coupled mass characteristics of the air cushion and water plug, along with the air buoyancy decreasing coefficient and a reasonable range for the additional mass coefficient, it is possible to accurately predict the natural vibration period of the composite bucket foundation. The added mass coefficient decreases as the draft increases, and the charge and exhaust modes are more effective than the top ballast mode for adjusting the natural period of the structure by changing its draft.

Key words

offshore wind power / composite bucket foundation / natural vibration period / added mass coefficient / oscillatory motion

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Liu Xianqing, Li Wenlong, Ding Yu, Zhang Puyang, Zhang Yu, Hu Shenghong. STUDY ON CALCULATION METHOD OF NATURAL VIBRATION PERIOD OF COMPOSITE BUCKET FOUNDATION FOR OFFSHORE WIND TURBINES[J]. Acta Energiae Solaris Sinica. 2025, 46(9): 51-57 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0741

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