2004 Fiscal Year Final Research Report Summary
The prevention of the low frequency noise problem generated with enlargement of an overflow gate
| Project/Area Number |
15560195
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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 |
Dynamics/Control
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| Research Institution | Saitama University |
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Principal Investigator |
SATO Yuichi Saitama University, Mechanical Engineering Department, Professor, 工学部, 教授 (30134828)
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| Co-Investigator(Kenkyū-buntansha) |
NAGAMNIE Takuo Saitama University, Mechanical Engineering Department, Research Associate, 工学部, 助手 (00323379)
TSUJIOKA Kazuaki Saitama University, Mechanical Engineering Department, Lecturer, 工学部, 講師 (10251646)
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| Project Period (FY) |
2003 – 2004
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| Keywords | Vibration of water sheet / Self-excited vibration / Stability / Feedback / Nappe |
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| Research Abstract |
This report describes the experimental and analytical study on the instability of falling water sheets. Falling water sheets composing enclosed room with behind wall incite their vibration. This phenomenon leads to low frequency pressure's vibration, and it makes trouble that resonates other structures on such as a dam's gate. On this study, we performed laboratory experiments, and confirmed that S products of its frequency and falling time are uniform to figure a little larger than integer. We consider the vibration is caused by feedback of water sheets kinetic energy through air pressure in enclosed room. The result of this analysis shows the figure S must be about integral value+1/4. The vibration can be suppressed by cutting off the feedback with a baffle.
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