Dynamic response of a SWATH vessel for installing pre-assembled floating wind turbines |
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| Affiliation: | 1. Department of Ocean Space Operations and Construction Engineering, Norwegian University of Science and Technology, Norway;2. Department of Marine Technology, Norwegian University of Science and Technology, Trondheim 7049, Norway;3. Department of Engineering Sciences, University of Agder, N-4898, Grimstad, Norway;4. School of Naval Architecture, Ocean and Energy Power Engineering, Wuhan University of Technology, China;5. Seacraft AS, 6010,.Ålesund, Norway;1. College of Engineering, Ocean University of China, Qingdao 266100, China;2. Shandong Province Key Laboratory of Ocean Engineering, Ocean University of China, Qingdao 266100, China;3. China Three Gorges Renewables (Group) Co., Ltd., Beijing 101100, China;1. DLR Institute for Maritime Energy Systems, Geesthacht, Germany;2. Hamburg University of Technology, Hamburg, Germany;3. 50Hertz Transmission GmbH, Berlin, Germany;1. School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, China;2. gMarine, Houston, TX, USA;3. China Ship Scientific Research Center (CSSRC), Wuxi, 214082, China;1. State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Dalian University of Technology, No. 2 Linggong Road, Dalian, 116023, China;2. College of Mechanical and Electrical Engineering, Harbin Engineering University, No. 145 Nantong Street, Harbin, 150001, China;1. Shanghai Engineering Research Center of Marine Renewable Energy, College of Engineering Science and Technology, Shanghai Ocean University, Shanghai, China;2. University of Stavanger, Norway |
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| Abstract: | New and efficient installation concepts which can reduce the cost of developing an offshore wind farm are of particular interest. This paper explores a promising concept using the small water-plane area twin-hull vessel (SWATH) to install pre-assembled wind turbines (OWT) onto floating spar foundations. A focus is placed on the hydrodynamic performance of the SWATH and the response analysis of the coupled SWATH-spar system. Firstly, the numerically calculated difference-frequency wave force effect and damping forces of the original SWATH were verified with experimental data. Secondly, the original SWATH was modified to satisfy the criteria of weight-carrying capacity and hydrostatic stability. Thirdly, a multibody numerical model for the SWATH-spar system was developed, in which the hydrodynamic and mechanical couplings between the SWATH and a spar were considered. The SWATH is equipped with a dynamic positioning system to counteract the slow-drift wave force effects. The nonlinear time-domain simulations were carried out for the mating stage when a wind turbine is lifted above the spar foundation. Based on the analysis of statistics of the relative displacement and velocity of the tower bottom and the spar top, the installation concept with SWATH is found to be of decent performance. Finally, recommendations are provided for future research on this concept, which contributes to developing next-generation installation concepts for bottom-fixed and floating wind farms. |
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| Keywords: | SWATH installation Vessel Hydrodynamic responses Model test verification Spar floating wind turbine Mating process Multibody simulation |
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