| Project/Area Number |
06650524
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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 |
構造工学・地震工学
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| Research Institution | KYUSHU INSTITUTE OF TECHNOLOGY |
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Principal Investigator |
KUBO Yoshinobu KYUSHU INSTITUTE OF TECHNOLOGY,PROFESSOR, 工学部, 教授 (70093961)
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| Co-Investigator(Kenkyū-buntansha) |
KATO Kusuo KYUSHU INSTITUTE OF TECHNOLOGY,RESEARCH ASSOCIATE, 工学部, 助手 (60039138)
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| Project Period (FY) |
1994 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1995: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1994: ¥1,900,000 (Direct Cost: ¥1,900,000)
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| Keywords | SUPER-LONG BRIDGE / FLUTTER / ACTIVE CONTROL / CONTROL OF SEPARATION FLOW / ROTOR / UNSTEADY PRESSURE / 境界層制御 / 制振 |
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| Research Abstract |
The object of the research project is how to suppress aerodunamic instability of super-long suspension bridge, which will be constructed in 21st century. The problem to be solved is to suppress flutter of super-long suspension bridge or to increase the flutter-on-set wind velocity by a certain technical method. A few methods are already proposed. Most of them are the methods to improve the dynamic performances by changing structural performances. On the other hand, the present method is based on the idea to control aerodynamic forces inducing flutter of girder of super-long suspension bridge. Since the predominant aerodynamic forces are generated by the separation flow from the leading edge of the girder, in the present research, the separation flow from leading edge is controlled by setting the rotor at the leading edge of shallow rectangular cylinder, which is the typical cross section of the bridge girder.
The experiments are conducted by using the wind tunnel. The aerodynamic responses and unsteady aerodynamic surface pressures are measured. According to the experimental results, the flutter-on-set wind velocity is raised up to 3 times of without rotor. The boundary layr is shrank by rotaing the cylinder and the surface pressure fluctuation is suppressed.
The results show the usefulness to improve the aerodynamic performances of the super-long suspension bridge.
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