Time-domain analyses of elastic response and second-order mooring force on a very large floating structure in irregular waves |
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| Affiliation: | 1. University of Tokyo, 7-22-1 Roppongi Minato-ku, Tokyo 106-8558, Japan;2. IIS, University of Tokyo, 4-6-1 Komaba Meguro-ku, Tokyo 153-8505 Japan;3. Nihon University, 7-24-1 Narashinodai Funabashi-shi, Chiba 274-8501, Japan;1. DHI-NTU Centre, Nanyang Environment and Water Research Institute (NEWRI), Nanyang Technological University, 1 CleanTech Loop, CleanTech One, #06-08, 637141, Singapore;2. School of Civil and Environmental Engineering, Nanyang Technological University, N1-01a-29, 50 Nanyang Avenue, 639798, Singapore;3. 132 Rowley Laboratories, Civil and Environmental Engineering, Clarkson University, Potsdam, NY, 13699-5710, USA;1. Department of Naval Architecture and Ocean Engineering, Osaka University, Japan;2. National Maritime Research Institute, Japan |
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| Abstract: | Real sea areas where very large floating structures are installed are random wave fields. Then, it is necessary to analyze the responses in the time domain due to directional waves. There exist hydroelastic deflections and slow drift motions in the responses of VLFSs in ocean waves. However, it is very time consuming to solve the equations of motion in the time domain and obtain these responses due to directional waves. It is unnecessary to solve such equations in the time domain, if mooring forces can be turned into on equivalent linear system. In this paper, we analyze the time-series responses without solving the equations of motion in the time domain. And, the corresponding model tests in uni- and two-directional irregular waves are carried out. The present method is validated by comparisons between the analytical and measured results of time histories, and moreover, the analytical method of a slowly varying wave drift force is also validated. |
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