| Project/Area Number |
18560475
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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 |
Structural engineering/Earthquake engineering/Maintenance management engineering
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| Research Institution | Ritsumeikan University |
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Principal Investigator |
KOBAYASHI Hiroshi Ritsumeikan University, Research organization of science and engineering, Chair professor (90066712)
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| Project Period (FY) |
2006 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥3,680,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥180,000)
Fiscal Year 2007: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2006: ¥2,900,000 (Direct Cost: ¥2,900,000)
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| Keywords | bridge / wind / vortex induced oscillation / sound / periodic suction and blowing / rectangular cylinder / suppression |
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| Research Abstract |
A rectangular cylinder supported by spring in a flow meets vortex induced oscillation. In this study the vortex excited oscillation is tried to be suppressed by sound. The sound is emitted at the leading edges of the rectangular cylinder.
The sound whose frequency was up to 300 Hz and having sufficient sound pressure could suppress the oscillation.
The low frequency suction and blowing produced by a piston was applied instead of sound. The suction and blowing above 10 Hz had suppression effect. The dynamic pressure by approaching flow was used instead of piston blowing. In this method the suppression effect was appeared only translation motion of vortex oscillation.
The flow measurement test showed that the sound progressed the transition of separated flow and shrunk the separated bubble. The measurement of unsteady pressure showed that the sound had the effect of reducing the amplitude of surface pressure.
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