The wet-towing resistance of the composite bucket foundation for offshore wind turbines |
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| Institution: | 1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin, 300072, China;2. School of Civil Engineering, Tianjin University, Tianjin, 300072, China;3. Yellow River Institute of Hydraulic Research, YRCC, Zhengzhou, 450003, China;4. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing, 100101, China;1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin, 300072, China;2. Tianjin Research Institute for Water Transport Engineering,M.O.T., Ministry of Transport, Tianjin, 300456, China;3. School of Civil Engineering, Tianjin University, Tianjin, 300072, China;1. Hyundai Maritime Research Institute, Hyundai Heavy Industries Co., Ltd., Ulsan 44032, Republic of Korea;2. Department of Naval Architecture and Ocean Engineering, and Research Institute of Marine Systems Engineering, Seoul National University, Seoul 08826, Republic of Korea;1. School of Naval Architecture and Ocean Engineering, Dalian University of Technology (DUT), NO-116024, Dalian, China;2. Department of Marine Technology and Centre for Autonomous Marine Operations and Systems (AMOS), Norwegian University of Science and Technology (NTNU), Trondheim, 7491, Norway;1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin, 300072, China;2. Department of Civil, Environmental and Geomatic Engineering, University College London, London WC1E 6BT, UK;1. College of Engineering, Ocean University of China, Qingdao, 266100, PR China;2. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai, 200240, PR China;3. Liaoning Engineering Laboratory for Deep-Sea Floating Structure, School of Naval Architecture, Dalian University of Technology, Dalian, 116024, PR China |
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| Abstract: | The composite bucket foundation (CBF) is a new and environmentally-friendly foundation for offshore wind turbines. This foundation can be prefabricated in batches onshore followed by integrated transport and installation at sea. The structure itself has a subdivision air cushion structure that enables the foundation to float stably on the water surface and realize long-distance towing of the foundation. The mechanism of this air-liquid-solid coupling towing process is complicated, and the influence of the bulkheads on the towing resistance is not clear. In this paper, the influence of the subdivision structure on the towing resistance of the CBF is compared with the tow test in hydrostatic water. The structural motion characteristics and the change of the cushion pressure are also analysed. Experiments are used to verify numerical calculation results. The flow field difference between the CBF with bulkheads, the CBF without bulkheads and the real floating structure was analysed. The dynamic pressure coefficient was used to analyze the force at surfaces of different CBF's. For the tow test and numerical calculation of multiple CBFs, the optimal multi-CBF tow distance and towage number are obtained through the calculation of energy consumption rate. |
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| Keywords: | Composite bucket foundation Air-cushion floating structure Towing resistance Offshore wind turbines |
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