Nonlinear dynamics and impact load in float-over installation |
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| Institution: | 1. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai, China;2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai, China;3. Centre for Offshore Foundation Systems, The University of Western Australia, Australia;1. Department of Mathematics, University of Oslo, PO Box 1053 Blindern, NO-0316 Oslo, Norway;2. Department of Mathematical Sciences, NTNU, NO-7491 Trondheim, Norway;3. Signal Theory and Communications Department, Superior Polytechnic School, University of Alcalá, Alcalá de Henares, 28805 Madrid, Spain;1. National Technical University of Athens, 9 Iroon Polytechneiou, Zographos, 15780, Greece;2. David Taylor Model Basin-NSWCCD, 9500 Macarthur Blvd., W. Bethesda, MD, USA;1. College of Engineering, Ocean University of China, Qingdao, 266100, PR China;2. Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John''s, NL, A1B3X5, Canada;3. Key Laboratory of Ocean Engineering of Shandong Province, Qingdao, 266100, PR China |
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| Abstract: | A time-domain 3 Degrees of Freedom model is developed to investigate nonlinear dynamics and impact loads during float-over installations, which generally involve multi-body interactions between wave-induced vessel motions and nonlinear constraint components. By replacing the time-consuming convolution in calculating the retardation function, a more efficient method, i.e. state-space model, is applied to evaluate part of the radiation force. The established model, incorporating the multi-body interactions, is applied to study the nonlinear impact on Leg Mating Unit (LMU) by considering the sway, heave and roll motions of the float-over system. The structural characteristics are considered when modelling the characteristics of LMU. The dynamic behaviors of a given system is investigated in the form of bifurcation diagrams, along with impact map, amplitude spectrum and power spectral density (PSD). It is found that bifurcation phenomena, or a large angle of docking cone could dominate the installation due to the increased impact loads. |
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| Keywords: | Float-over installation Non-linear dynamics State-space model Bifurcation phenomena Impact load |
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