Experimental measurements of the complex motion of a suspended axisymmetric floating body in regular and near-focused waves |
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| Affiliation: | 1. Associated Graduate Program in Physical Education UPE/UFPB, University of Pernambuco, Recife, PE, Brazil;2. Albert Einstein Hospital, Sao Paulo, SP, Brazil;3. Associated Graduate Program in Physical Education UEL/UEM, State University of Maringá, Maringá, PR, Brazil;4. Faculty of Medicine, University of São Paulo, São Paulo, SP, Brazil;1. Department of Medicine, Amager Hvidovre Hospital in Glostrup, University of Copenhagen, Glostrup, Denmark;2. Research Unit for Exercise Epidemiology and Department of Sport Science and Clinical Biomechanics, Centre of Research in Childhood Health, University of Southern Denmark, Odense, Denmark;3. Department of Clinical Biochemistry, Rigshospitalet Blegdamsvej, University of Copenhagen, Copenhagen, Denmark;4. Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark;5. Faculty of Education, Arts, and Sport, Western Norway University of Applied Sciences, Campus Sogndal, Norway;6. Department of Sports Medicine, Norwegian School of Sport Sciences, Oslo, Norway;7. Department of Medicine O, the Endocrine Unit, Herlev Gentofte Hospital, University of Copenhagen, Herlev, Denmark;8. Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark;1. School of Sport Sciences, UiT The Arctic University of Norway, Tromsø, Norway;2. Centre for Clinical Research and Education, University Hospital of North Norway, Tromsø, Norway;3. Department of Community Medicine, UiT The Arctic University of Norway, Tromsø, Norway;4. Department of Cardiology, Akershus University Hospital, Lørenskog, Norway;5. Institute of Clinical Medicine, University of Oslo, Oslo, Norway;6. Department of Clinical Medicine, UiT The Arctic University of Norway, Tromsø, Norway |
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| Abstract: | Numerical models which account for the multiple response modes of floating wave energy converters (WECs) in operating conditions require experimental data for validation. Measurement and observation of complex hydrodynamic mechanisms are also required to inform the development of modelling tools suitable for the simulation of response to extreme waves. Experimental measurements are reported of the motion of an axisymmetric float to regular and near-focused waves. The mechanical system, incident wave conditions and response in a 2D vertical plane are detailed to facilitate comparison to numerical simulations. The system comprises a heaving float connected to a counterweight by an inextensible cable over two pulleys to provide a simplified representation of the slowly varying surge constraint of a mooring system. Translation of the float is measured using an optical encoder. Motion in heave, surge and pitch are also determined by a position identification method based on analysis of video footage. For low frequency regular waves, the float prescribes an elliptical trajectory and the variation of response amplitude with wave amplitude is linear. At higher frequencies, drift of up to one-third of the float radius is observed and the float oscillates along an arc. More complex motions are observed due to the three large amplitude waves of a near-focused wave group. During these waves the upper surfaces of the float are partly immersed and motion occurs in heave, surge and pitch. |
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