STUDY ON NATURAL VIBRATION CHARACTERISTICS AND MOTION RESPONSE OF FOUR-BUCKET FOUNDATIONS DURING AIR-FLOATING

Liu Xianqing; Zhao Mingjie; Le Conghuan; Yu Kui; Luo Sheng

doi:10.19912/j.0254-0096.tynxb.2021-0803

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (1) : 211-217. DOI: 10.19912/j.0254-0096.tynxb.2021-0803

STUDY ON NATURAL VIBRATION CHARACTERISTICS AND MOTION RESPONSE OF FOUR-BUCKET FOUNDATIONS DURING AIR-FLOATING

Liu Xianqing^1,2, Zhao Mingjie^1,2, Le Conghuan³, Yu Kui^1,2, Luo Sheng⁴

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Abstract

Aiming at the dynamic and motion characteristics of multi-bucket foundation during air-floating, a four-bucket foundation with a distance between the buckets of 2.5 times diameter is designed. A combination approach of physical model tests with a scale of 1：25 and numerical models is adopted to investigate the natural vibration characteristics in still water and motion responses under regular waves. The results show that the natural vibration characteristics in still water and the change trend of motion responses in regular waves can be well predicted by numerical simulations. With the draft increasing, the damped natural vibration period increases, while the added mass coefficient and damping ratio decreases. The added mass coefficient varies between 1.4-1.7. Increasing draft can improve the oscillating motion performance of the structure, but it increases the heaving response and enlarges the periodic range of amplitude close to the maximum amplitude of pitching motion. The shallower the water, the greater the oscillating motion.

Key words

offshore wind power / bucket foundation / added mass coefficient / response amplitude operator / draft / water depth

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Liu Xianqing, Zhao Mingjie, Le Conghuan, Yu Kui, Luo Sheng. STUDY ON NATURAL VIBRATION CHARACTERISTICS AND MOTION RESPONSE OF FOUR-BUCKET FOUNDATIONS DURING AIR-FLOATING[J]. Acta Energiae Solaris Sinica. 2023, 44(1): 211-217 https://doi.org/10.19912/j.0254-0096.tynxb.2021-0803

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