Cross-flow vortex-induced vibration reduction of a long flexible cylinder using 3 and 4 control rods with different configurations |
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| Institution: | 1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin, China;2. School of Civil Engineering, Tianjin University, Tianjin, China;3. China Electric Power Research Institute, Beijing 100192, China;1. Department of Naval Architecture and Ocean Engineering, Zhejiang Ocean University, Zhoushan, China;2. Department of Naval Architecture and Ocean Engineering, Seoul National University, Seoul, Republic of Korea;3. Research Institute of Marine Systems Engineering, Seoul National University, Seoul, Republic of Korea;4. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, China;1. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, Shanghai, 200240, China;2. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China;1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, Southwest Petroleum University, Chengdu 610500, PR China;2. Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-8656, Japan;1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin, 300072, China;2. Collaborative Innovation Centre for Advanced Ship and Deep-Sea Exploration, Shanghai, 200240, China;3. School of Civil Engineering, Tianjin University, Tianjin, 300072, China;4. School of Marine Science and Technology, Newcastle University, Newcastle upon Tyne, NE1 7RU, United Kingdom;1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin, 300072, China;2. Collaborative Innovation Centre for Advanced Ship and Deep-Sea Exploration, Shanghai, 200240, China |
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| Abstract: | Control rod is one of the common passive control methods to suppress the vortex-induced vibration (VIV) of cylindrical structures. In this paper, the experimental study is conducted to detailed understand the performance of multiple control rods in suppressing the cross-flow (CF) VIV for a long flexible cylinder. The influence of the spatial arrangement of 3 and 4 control rods on CF VIV response of the main cylinder is investigated in a towing tank. It is observed that the attack angle θ is a very significant parameter to affect the vibration response, dominant frequency and the VIV suppression efficiency of the main cylinder. Based on the suppression efficiencies analysis of VIV response in the present experimental investigation, the spatial arrangement of 3 control rods with θ = 40° and 4 control rods with θ = 30° is the best choice for suppressing the CF VIV response of the main flexible cylinder. Overall, the use of 4 control rods could reduce VIV more effectively than the application of 3 control rods. |
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| Keywords: | VIV suppression Control rods Flexible cylinder Suppression efficiency Attack angle |
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