係留ラインに働く静的および動的張力特性について

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This paper describes on the static tension and characteristics of the dynamic tension acting on various kinds of mooring line systems. The tensions acting on the mooring line systems witch consist of combinations by using chain, wire rope, buoy and sinker, were measured using scale models in static and dynamic conditions. The experimental results were compared with numerical calculations. The main results obtained are as follows; 1) It was confirmed that the static tension acting on the mooring line systems can well estimated by lumped mass method. 2) The author developed a new computer program to estimate the tension distribution of a multiple mooring line system as well as equilibrium position of the floating body and other factors. The program was validated by model experiments and applied to design a full scale offshoer structure. 3) As to dynamic tension of the mooring line systems, model experiments were carried out over a wide range of mooring conditions. It was found that the results calculated by lumped mass method and approximate method both agreed with experimental results except extremely slack mooring conditions. 4) The effects of the buoy and sinker to dynamic tension of the mooring line systems were made clear by model experiments. 5) The forced oscillation tests in which the motion of the floating body was set by large amplitude with low frequency mode and small amplitude with high frequency mode, were carried out. As a results, the dynamic tension can be estimated by making a linear super-position in the frequency domain.
独立行政法人海上技術安全研究所の論文
1988-03-30

係留ラインに働く静的および動的張力特性について

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