超大型浮遊式海洋構造物の波浪中における諸性能に関する基礎的研究 : その1 波強制力及び波浪中動揺応答特性

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Some results of fundamental studies on hydrodynamic performance in waves of a huge offshore floating structure, which consists of an upperdeck and a lot of supporting floating bodies arranged in rows and lines, are presented. Three types of floating bodies, namely footing-type, lowerhull-type and pontoon-type, are considered. Wave exciting forces acting on a single floating body and group of the floating bodies were measured in regular and transient waves. Motions in waves on the three types of floating strucres, each of which was supported by one of the different three types of floating bodies, were also measured. The experimental results are compared with theoretical ones which neglect hydrodynamic interferences among the floating bodies. The theoretical values of the were exciting forces acting on single floating bodies agree well with experimental ones except for a lowerhull-type floating body. As for were exciting forces acting on individual floating body in a group of them, experimental results are lower than the theoretical ones in high-frequency range due to the hydrodynamic interferences among the floating bodies. In six components of motions in waves, heaving, surging and pitching in head seas and heaving in beam seas can be estimated fairly accurately by a simple calculation method, which uses wave exciting forces calculated in neglecting hydrodynamic interferences among the floating bodies, except for motions at the natural frequencies, because the motions become very small in high-frequency range, where the difference between the experimental and theoretical values for wave exciting forces becoms large. The motions at the natural frequencies can be estimated correctly if the dampings are appropriately estimated through certain methods, such as free oscillation tests. Swaying and rolling in beam seas can not be estimated accurately by the simple calculation method on the models used for experiments in this research.
独立行政法人海上技術安全研究所の論文
1983-09-30

超大型浮遊式海洋構造物の波浪中における諸性能に関する基礎的研究 : その1 波強制力及び波浪中動揺応答特性

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