| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Outline of Final Research Achievements |
To assure the complete long-term stability and safe operation of the large number of Tainter gates used worldwide, the following research was conducted. First, the effect of the upstream submergence (upstream water level) on the natural vibration mode of the gate were carefully examined using 3D model gates. The FEM analysis was also used. In addition, the field vibration test on practical Tainter gate was conducted for dry and wet condition. As a result, it was confirmed that the natural vibration mode of the skinplate is determined as an inherent vibration characteristic of the gate structure, and the water in contact with the skinplate has the effect of only lowering the natural frequency due to the added mass effect. Furthermore, the prototype of the decision system of the dynamic stability/ instability of Tainter gate was made for trial.
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