An experimental investigation on vortex induced vibration of a flexible inclined cable under a shear flow |
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| Institution: | 1. Key Lab of Structures Dynamic Behavior and Control (Harbin Institute of Technology), Ministry of Education, Harbin, Heilongjiang 150090, China;2. School of Civil Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150090, China;3. Department of Aerospace Engineering, Iowa State University, Ames, IA 50011, USA;1. Key Laboratory for Mechanics in Fluid Solid Coupling System, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;2. School of Aeronautics Science and Technology, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;1. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai, China;2. Statoil, Trondheim, Norway;3. Marintek, Trondheim, Norway;4. Dept. of Marine Technology, Centre for Ships and Ocean Structures, NTNU, Trondheim, Norway;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. Collaborative Innovation Centre for Advanced Ship and Deep-Sea Exploration, Shanghai 200240, China;4. School of Marine Science and Technology, Newcastle University, Newcastle upon Tyne NE1 7RU, United Kingdom;1. Department of Mechanical Engineering, Universitat Rovira i Virgili (URV), 43007 Tarragona, Spain;2. Naval Architecture Department, Technical University of Madrid (UPM), 28040 Madrid, Spain |
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| Abstract: | In the present study, an experimental investigation was performed to characterize the vortex induced vibration (VIV) of a flexible cable in an oncoming shear flow. The VIV tests were conducted in a wind tunnel with a flexible cable model. It was found that, under different oncoming velocity profiles, the cable model behaved in single-mode and multi-mode VIVs. The displacement amplitudes of the single mode VIVs were found to be larger than those of multi-mode VIVs, and the cross-flow (CF) response was larger than that of in-line (IL) direction for either the single mode or multi-mode VIVs. For a single mode vibration, the largest CF response occurs in the 1st mode VIV, and the motion trajectory of the 1st mode VIV was found to be an inclined figure of eight shape, while other single mode VIVs behaved in ellipse or straight line trajectories. For multi-mode VIVs, no stable vibration trajectories were found to exist since the vibration frequency bands covered two or more vibration modes. The vortex-shedding frequencies in the wake behind the inclined cable were also characterized in the present study. The shedding frequencies of the wake vortices were found to coincide well with the vibration modes: for a single mode VIV, they were close to the dominant vibration mode; for a multi-mode VIV, they could also cover the appearing vibration modes. |
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| Keywords: | Vortex-induced vibrations Flexible cables Shear flow Experimental investigation |
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