気泡群の間けつ吹出しによる液体貯槽スロッシングの能動的制振の実験的研究

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  • Experimental study of active suppression due to gas bubbles for earthquake-induced sloshing in liquid tanks.
  • キホウグン ノ カンケツ フキダシ ニ ヨル エキタイ チョソウ スロッシング

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This research aimed to develop a technique to suppress a liquid sloshing vibration in a tank by injecting air bubbles in a microcomputer controlled manner. Using a rectangular tank 800 mm long, 150 mm wide, and 500 mm high, installed on an oil-hydraulic controlled shaking table, sloshing was excited by sinusoidal motion of the table and air was injected at each corner of the test tank. The timing and duration of air injection were controlled by a microcomputer using pressure signal caused by sloshing. Experiments showed that the most effective timing of air injection was at the instance when the sloshing wave was ascending form the lowest position to the equibrium one, and a small amount of air, equivalent to 1 to 3 % of water contained in the tank, was sufficient to suppress the sloshing. A scale-up test showed similar effectiveness on reducing sloshing. An argorithm for controlling air injection timing and duration was developed using knowledge obtained from the experiments.

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