Numerical study on the dynamics of a two-raft wave energy conversion device |
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| Affiliation: | 1. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China;2. Department of Mechanical and Aerospace Engineering, University of Strathclyde, Glasgow G1 1XJ, United Kingdom;3. Marine Renewable Energy Ireland, University College Cork, Ireland;1. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China;2. MaREI, Environment Research Institute, University College Cork, Cork, Ireland;1. College of Shipbuilding Engineering, Harbin Engineering University, Harbin 150001, China;2. Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China;3. Department of Architecture and Civil Engineering, University of Bath, Bath BA2 7AY, UK;4. College of Science, Harbin Engineering University, Harbin 150001 China;5. College of Mechanical and Electrical Engineering, Harbin Engineering University, Harbin 150001 China;6. School of Naval Structure and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China;1. School of Civil, Environmental and Mining Engineering, The University of Western Australia, Perth, Australia;2. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai, China;3. Marine Design and Research Institute of China, Shanghai, China;4. State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, Southwest Petroleum University, Chengdu, China;5. School of Mechanical Engineering, The University of Tokyo, Tokyo 113-8656, Japan;6. Wuxi First Scientific Research Institute, Wuxi, China |
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| Abstract: | This paper presents a dynamic analysis of a two-raft wave energy conversion device based on the three-dimensional wave radiation-diffraction method. The device consists of two hinged cylindrical rafts of elliptical cross section and a power take-off system at the joint. The effect of raft length, linear damping and spring coefficient in the power take off (PTO) system, axis ratio (ratio of minor axis to major axis of raft elliptical cross section) and raft radius of gyration on wave energy capture factor has been investigated in frequency domain, while the effects of a nonlinear Coulomb power take-off, raft radius of gyration and latching control have been studied in time domain. The difference in the performance of a raft-typed device obtained using a linear damping and a Coulomb damping is also illustrated. |
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| Keywords: | Wave energy Wave energy converter Raft-type Gyration radius Power take-off system Energy capture factor |
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