2001 Fiscal Year Final Research Report Summary
Field Vibration Tests of Full-Scale Tainter-Gates and Verificaiton of Its Theoretical Analysis
| Project/Area Number |
12650184
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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 |
Fluid engineering
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| Research Institution | Osaka Electro-Communication University |
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Principal Investigator |
ISHII Noriaki Osaka Electro-Communication University, Faculty of Engineering, Professor, 工学部, 教授 (40098083)
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| Project Period (FY) |
2000 – 2001
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| Keywords | Dynamics of Machinery / Flow-Induced-Vibration / Self-Excited Vibration / Coupled-Mode Vibration / Gate / Tainter Gate / Radial Gate / Field Vibration Tests |
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| Research Abstract |
Tainter gates (radial gates) are frequently used as a crest gate of dam for a flood release. A huge Tainter gate installed on Folsom dam in Califrnia, induced vibrations and failed, early in the morning of July 17, 1995. Apossibility that vibration participated in its failure was pointed out from just after the accident, and some failure analysis studies have been performed by applicants
In this study, field vibration tests were conducted on a 47-ton full-scale gate under practical uses, to determine its in-air and in-water natural vibration characteristics. Experimental modal tests, using an impact hammer and accelerometers, were conducted on the gate, thus addressing its in-air natural frequencies, mode shapes and modal damping. Subsequently, the in-water vibration tests were conducted to reveal the vibration characteristics of the gate. Conclusively, comparison of the calculated inherent in-water vibration frequency and the measured frequency of the in-water self-excited vibration confirms the validity of the theoretical analysis developed for full-scall gate
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Research Products
(10 results)
