Load effects on vessel-shaped fish cage steel structures,nets and connectors considering the effects of diffraction and radiation waves under irregular waves |
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| Affiliation: | 1. State Key Laboratory of Ocean Engineering, SJTU, China;2. Centre for Autonomous Marine Operations and Systems (AMOS), NTNU, Norway;3. Yantai CIMC Offshore Co., Ltd, China;4. Yantai CIMC Blue Ocean Technology Co., Ltd, China;1. National Maritime Research Institute, 6-38-1, Shinkawa, Mitaka-shi, Tokyo, 181-0004, Japan;2. Faculty of Engineering Yokohama National University, 79-1 Tokiwadai Hodogaya-ku, Yokohama, Kanagawa, 240-8501, Japan;1. School of Civil Engineering, Hunan University of Technology, Zhuzhou, Hunan, 412007, China;2. Key Laboratory of Safety Control of Bridge Engineering, Ministry of Education (Changsha University of Science and Technology), Changsha, Hunan, 410114, China;3. China Institute of Water Resources and Hydropower Research, Beijing, 100038, China;1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin, 300072, China;2. School of Mechanical Engineering, Tianjin University, 135 Yaguan Road, Tianjin, 300072, China;1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin, 300072, China;2. Maritime College, Tianjin University of Technology, Tianjin, 300384, China;3. Southern Offshore Wind Power Joint Development Co. Ltd, ZhuHai, 519080, China |
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| Abstract: | Vessel-shaped fish cages are mainly composed of a large floating body, aquaculture nets and a number of steel frames. Due to the large scale of vessel-shaped fish cages, the velocity field induced by the diffraction waves and radiation waves cannot be ignored in the calculation of the loads on the net and steel frames. In turn, the loads can affect the wave-induced response of the floating body and hence the radiation waves as well as the sectional forces. In this paper, a novel method is proposed to consider the coupling effect. First, considering the irregular waves in short-term periods, the global response of the floating body is calculated in the time domain by the state-space method based on potential flow theory. Meanwhile, the velocity field considering the influence of the floating body is built according to the velocity transfer function. Then, the Morison formula is used to calculate the loads on the nets and the steel frames. Finally, the coupling achieved through numerical iterations is considered in the calculation of the twine tension, load effect of connector and the global cross-section under irregular waves. It is found that the diffraction and radiation waves make a significant difference in the twine tension and connector load effect. |
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| Keywords: | Vessel-shaped fish cage Tension in net twine Load effect of connectors Velocity field transfer function Diffraction and radiation waves Irregular waves |
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