| Project/Area Number |
10555346
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| Research Category |
Grant-in-Aid for Scientific Research (B).
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
海洋工学
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| Research Institution | KYUSHUUNIVERSITY |
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Principal Investigator |
KASHIWAGI Masashi Kyushu University, Res. Inst. For Appl. Mech., Assoc. Prof., 応用力学研究所, 助教授 (00161026)
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| Co-Investigator(Kenkyū-buntansha) |
OHKUSU Makoto Kyushu University, Res. Inst. For Appl. Mech., Professor, 応用力学研究所, 教授 (70038537)
YASUZAWA Yukitaka Kyushu University, Faculty of Engineering, Assoc. Prof., 工学部, 助教授 (10191123)
NAKAMURA Masahiko Kyushu University, Res. Inst. For Appl. Mech., Assoc. Prof., 応用力学研究所, 助教授 (40155859)
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| Project Period (FY) |
1998 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥9,200,000 (Direct Cost: ¥9,200,000)
Fiscal Year 2000: ¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 1999: ¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 1998: ¥3,500,000 (Direct Cost: ¥3,500,000)
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| Keywords | Hydroelasticity problems / Column-supported very large structure / Pontoon-type very large structure / Wave drift force / Hydrodynamic interactions / Transient responses / ハイブリッド型大型浮体 / 直接圧力積分法 / 運動量保存則 / 流力弾性 / 階層型相互干渉理論 / 過渡現象 / 時間領域 / セミサブ型大型浮体 / 階層型理論 |
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| Research Abstract |
(1) A new calculation method was developed for a column-supported very large floating structure, in which the elastic deflection of the upper deck was represented by a superposition of natural modes of a rectangular thin plate, and hydrodynamic interactions among a great number of supporting columns were correctly taken into account.
(2) Model experiments have been conducted using 64 vertical circular cylinders arranged in 4 rows and 16 columns with equal separation distance. Measured were hydrodynamic forces on some of individual cylinders and the wave elevation along the center line of the structure. Measured results were in good agreement with the computed results by the newly-developed hierarchical interaction theory.
(3) Two different calculation methods were developed for computing the wave drift force and moment on a column-supported very large floating structure. One is the so-called "far-field" method based on the momentum-conservation principle, and the other is the "near-field" method by the direct pressure integration.The drift force on the whole 64 cylinders was precisely predicted by both methods, confirming the validity of both numerical methods. The local steady forces on each cylinder were also measured and the results were in good agreement with computed results by the "near-field" method.
(4) A time-domain calculation method was developed for evaluating transient elastic responses of a pontoon-type floating structure due to the take-off and landing of airplanes. Special efforts were devoted to the numerical accuracy and efficiency. Computed results were compared with measurements at the Ship Research Institute, which showed very good agreement confirming the validity of the developed numerical scheme.
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