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Air-Floating Characteristics of Large-Diameter Multi-Bucket Foundation for Offshore Wind Turbines

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  • Xianqing Liu

    (National Engineering Research Center for Inland Waterway Regulation, Chongqing Jiaotong University, Chongqing 400074, China
    State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China)

  • Puyang Zhang

    (State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China)

  • Mingjie Zhao

    (National Engineering Research Center for Inland Waterway Regulation, Chongqing Jiaotong University, Chongqing 400074, China)

  • Hongyan Ding

    (State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China)

  • Conghuan Le

    (State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China)

Abstract

In the present study, as a novel and alternative form of foundation for offshore wind turbines, the air-floating characteristics of a large-diameter multi-bucket foundation (LDMBF) in still water and regular waves are investigated. Following the theory of single degree of freedom (DOF)-damped vibration, the equations of oscillating motion for LDMBF are established. The spring or restoring coefficients in heaving, rolling and pitching motion are modified by a dimensionless parameter ϑ related to air compressibility in every bucket with the ideal air state equation. Combined with the 1/25 scale physical model tests and the numerically simulated prototype models by MOSES, the natural periods, added mass coefficients and damping characteristics of the LDMBF in free oscillations and the response amplitude operator (RAO) have been investigated. The results shown that the added mass coefficients between 1.2 and 1.6 is equal to or larger than the recommended values for ship dynamics. The coefficient 1.2 can be taken as the lower limit 1.2 for a large draft and 1.6 can be taken as the upper limit 1.6 for a small draft. The resonant period and maximum amplitudes for heaving and pitching motions decrease with increasing draft. The amplitudes of heaving and pitching movements decrease to a limited extent with decreasing water depth.

Suggested Citation

  • Xianqing Liu & Puyang Zhang & Mingjie Zhao & Hongyan Ding & Conghuan Le, 2019. "Air-Floating Characteristics of Large-Diameter Multi-Bucket Foundation for Offshore Wind Turbines," Energies, MDPI, vol. 12(21), pages 1-22, October.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:21:p:4108-:d:280964
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    References listed on IDEAS

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    1. Banerjee, Arundhuti & Chakraborty, Tanusree & Matsagar, Vasant, 2018. "Evaluation of possibilities in geothermal energy extraction from oceanic crust using offshore wind turbine monopiles," Renewable and Sustainable Energy Reviews, Elsevier, vol. 92(C), pages 685-700.
    2. Snyder, Brian & Kaiser, Mark J., 2009. "Ecological and economic cost-benefit analysis of offshore wind energy," Renewable Energy, Elsevier, vol. 34(6), pages 1567-1578.
    3. Blanco, María Isabel, 2009. "The economics of wind energy," Renewable and Sustainable Energy Reviews, Elsevier, vol. 13(6-7), pages 1372-1382, August.
    4. Banerjee, Arundhuti & Chakraborty, Tanusree & Matsagar, Vasant, 2019. "Dynamic analysis of an offshore monopile foundation used as heat exchanger for energy extraction," Renewable Energy, Elsevier, vol. 131(C), pages 518-548.
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    Cited by:

    1. Hongyan Ding & Zuntao Feng & Puyang Zhang & Conghuan Le & Yaohua Guo, 2020. "Floating Performance of a Composite Bucket Foundation with an Offshore Wind Tower during Transportation," Energies, MDPI, vol. 13(4), pages 1-19, February.
    2. Zhang, Puyang & Li, Yan'e & Ding, Hongyan & Le, Conghuan, 2022. "Response analysis of a lowering operation for a three-bucket jacket foundation for offshore wind turbines," Renewable Energy, Elsevier, vol. 185(C), pages 564-584.

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