| Project/Area Number |
16206086
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Naval and maritime engineering
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| Research Institution | KYUSHU UNIVERCITY |
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Principal Investigator |
KOTERAYAMA Wataru KYUSHU UNIVERCITY, Research Institute for Applied Mechanics, Specially Appointed Professor, 応用力学研究所, 特任教授 (80038562)
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| Co-Investigator(Kenkyū-buntansha) |
KAJIWARA Hiroyuki KYUSHU UNIVERCITY, Graduate school of Engineering, Associate Professor, Professor, 大学院工学研究院, 教授 (30114862)
NAKAMURA Masahiko KYUSHU UNIVERCITY, Research Institute for Applied Mechanics, Associate Professor, 応用力学研究所, 助教授 (40155859)
HU Changhong KYUSHU UNIVERCITY, Research Institute for Applied Mechanics, Associate Professor, 応用力学研究所, 助教授 (20274532)
TAMURA Kenkichi National Marine Research Institute, Ocean and Ice Engineering Department, Group Leader, 海洋開発研究領域, グループ長 (50373428)
HENGA Hidetaka Osaka University, Graduate School of Engineering, Research Associate, 大学院工学研究科, 助手 (60432522)
柏木 正 九州大学, 応用力学研究所, 教授 (00161026)
山口 悟 九州大学, 大学院工学研究院, 助教授 (00253542)
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| Project Period (FY) |
2004 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥35,880,000 (Direct Cost: ¥27,600,000、Indirect Cost: ¥8,280,000)
Fiscal Year 2006: ¥11,050,000 (Direct Cost: ¥8,500,000、Indirect Cost: ¥2,550,000)
Fiscal Year 2005: ¥12,220,000 (Direct Cost: ¥9,400,000、Indirect Cost: ¥2,820,000)
Fiscal Year 2004: ¥12,610,000 (Direct Cost: ¥9,700,000、Indirect Cost: ¥2,910,000)
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| Keywords | Riser / Ocean Bottom Platform / LPV Control / Dynamics / 渦励振 / 再現性 / 制御 / ゲインスケジューリング / 長大弾性管 / 不規則振動 |
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| Research Abstract |
Long marine risers are used for many purposes in ocean activities. Their lengths are very long compared with their cross section area, therefore, the stiffness relatively decreases and marine risers show very flexible behavior. These marine risers are always exposed to many external forces such as gravity, fluid forces and reaction force form the floating structure.
In this research, in order to develop a scheme of the time series simulation of the VIV of the hanging flexible riser, we carried out some irregular forced oscillating experiments. The top end of the riser model was oscillated irregularly in a horizontal plane (X direction). We think this irregular motion as the surging motion of the floating structure caused by ocean waves. For the wave data of irregular surging motion, we used an International Ship and Offshore Structures Congress (I.S.S.C) wave spectrum, which is defined as having significant wave height (Hw) and mean period (Tw). Experimental conditions were determined as combinations of the Hw and Tw. The resulting three-dimensional motion of the model was measured with CCD cameras, and the results were analyzed using a motion picture analysis method..
Finally, by comparing the numerical and experimental results, the accuracy of this numerical scheme was validated.
On the basis of above research, we developed a control system of a long riser. A gain scheduling controller is designed using LPV (Linear parameter varying) control method, where its design problem is formulated into a performance optimization problem with LMI (Linear Time Invariant) simultaneously. The performance of this controller is validated by comparing with experimental results.
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