1986 Fiscal Year Final Research Report Summary
Method of Designing the Composite Mooring Line.
| Project/Area Number |
60460147
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
船舶構造・建造
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| Research Institution | KYUSHU UNIVERSITY |
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Principal Investigator |
SUHARA T. Prof. Research Institute for Applied Mechanics, Kyushu Univ., 応用力学研究所, 教授 (60038528)
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| Co-Investigator(Kenkyū-buntansha) |
OHKUSU M. Prof. Research Institute for Applied Mechanics, Kyushu Univ., 応用力学研究所, 教授 (70038537)
TSUJI I. Prof. Faculty of Engineering, Kyushu Univ., 工学部, 教授 (80037697)
HIYAMA H. Research Associate. Res. Inst. Appl. Mech., Kyushu Univ., 応用力学研究所, 助手 (30038541)
YAMAKOSHI @m. Prof. Faculty of Engineering, Kyushu Univ., 工学部, 教授 (00037657)
KOTERAYAMA W. Prof. Research Institute for Applied Mechanics, Kyushu Univ., 応用力学研究所, 教授 (80038562)
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| Project Period (FY) |
1985 – 1986
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| Keywords | Mooring Line / Chain / Wire-Rope / Composite Mooirng Line System / Vibration / 変動張力 |
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| Research Abstract |
This paper deals with the approximate method for calculating the dynamic tension of simple and the composite mooring lines which is anchored in slack condition on the sea bed and is forced to oscillate vertically and horizontally at its upper end. An extensive series of experiments has been conducted to clarify the mechanism of generating the dynamic tension and the snapping of a mooring line. Using the results of experiments, the cable's shape during oscillation is approximated as a catenary line. Moreover, the oscillation of each component of a mooring line is idealized as a single-degree-of-freedom motion of one lumped mass. The dynamical equation of the motion of the mass are solved over a broad range of forcing amplitude and periods of practical use, and their threshold values for the snap are obtained analytically. The calculated results are in good agreement with those of the experiments.
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