長径間ゲートの流体関連振動 : 第3報,付加質量と液体減衰係数の検証

概要

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The long span gates vibrating in the streamwise direction push and draw the water in the reservoir, thus the gate is accompanied by an added mass of water. Moreover, the waves propagating in the upstream direction are formed on the free reservoir surface, thus resulting in a fluid damping effect on the vibrating gates. The added mass and fluid damping coefficient was derived theoretically in a dimensionless form in a previous study. To verify the theoretical results of the added mass and fluid damping coefficient, the experimental results of a model test are presented in this study. A planar vertical gate undergoes free damped vibrations in air and still water, respectively. The added mass and fluid damping coefficient are calculated from the measured frequencies and damping ratios of the damped vibrations. Consequently, it is shown that there is good agreement between the theoretical and experimental results.
社団法人日本機械学会の論文
1988-11-25