| Project/Area Number |
09650537
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
構造工学・地震工学
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| Research Institution | Ritsumeikan University |
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Principal Investigator |
KOBAYASHI Hiroshi Ritsumeikan University, Civil Eng., Professor, 理工学部, 教授 (90066712)
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1998: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1997: ¥1,300,000 (Direct Cost: ¥1,300,000)
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| Keywords | suspension bridge / flutter / active / control / flap / アクティブコントロール |
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| Research Abstract |
In the design of super long span suspension bridge, flutter vibration due to wind is very important problem. For suppressing it or increasing the onset velocity an active control technology is investigated. The employed method is that flaps attached at the both ends of stiffening girder are driven in time to the motion of the girder in the manner that the flaps produce the aerodynamic suppressing force. It was found that flutter of a suspension bridge could be suppressed by the feedback control by heaving and pitching motions of flutter.
Flutter control of a suspension bridge have a span of 3000 m was discussed. The width of flaps is a quarter of the deck width. Flutter speed without control was 39-m/s. Flap motion with suitable phase and amplitude could suppress the flutter. Reliability of the control system was discussed. Dividing the system spanwisely into small systems attributes a failsafe system ; flaps, driving system and wind power generator compose each of them.
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