1994 Fiscal Year Final Research Report Summary
Development of Installation Technique of Flexible Ocean Structure into Deepsea
| Project/Area Number |
04650390
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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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 | University of Tokyo |
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Principal Investigator |
SUZUKI Hideyuki University of Tokyo, Faulty of Engineering, Associate Professor, 工学部, 助教授 (00196859)
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| Co-Investigator(Kenkyū-buntansha) |
OKA Noriaki University of Tokyo, Faulty of Engineering, Assistantpi, 工学部, 助手 (80010891)
YOSHIDA Koichiro University of Tokyo, Faulty of Engineering, Professor, 工学部, 教授 (90010694)
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| Project Period (FY) |
1992 – 1994
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| Keywords | Active Control / Deepsea / Ocean Structure / Actuator / Elastic Vibration / Hydrodynamic Force / Installation Technique |
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| Research Abstract |
One key technology in the offshore development of increasingly deeper water will be remotely operated installation and construction of flexible structure. The flexibility comes from large scale of the structure or weight reduction of the structure. Conventional operation from the sea surface depends on the weather condition and not so efficient. Basic technique of remotely operated installation of elastic structure was developed. After review on the control of elastic response of structures. A control technique basically LAC/HAC was developed. In the technique, the elastic response is stabilized by DVFB (Direct Velocity Feedback) and major elastic and rigid body response is controlled.
The formulated control is verified by computer simulation and basin test using a model of a flexible structure. The experimental model consists of 25 rigid cylinders and each cylinder is connected to adjacent cylinders by slender beams. The model is lifted from initial position on the test basin and towed to another place and heading is changed to a predetermined direction and placed on predetermined position.
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