EFFECTIVENESS MOTION REDUCTION OF A FLOATING CAISSON WITH INTERSECTING ANTI-ROLLING TANKS IN REAL SEA CONDITIONS

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  • 実海域における減揺タンクを搭載した浮遊ケーソンの動揺低減効果

Abstract

<p> The authors have proposed a method of installing intersecting anti-rolling tanks at the top of the caisson to reduce the motion of the rotating system of a floating caisson and have confirmed its effectiveness in reducing the rotating motion through laboratory hydraulic experiments and numerical calculations. However, these studies were mainly based on regular waves, and it can be said that there was a small-scale effect. In this study, intersecting anti-rolling tanks were installed on an actual giant caisson (dead weight class 8000 tons) used for the eastern breakwater of the Hitachi-Naka Port Area of Ibaraki Port in Japan. The motion reduction effect was confirmed in real sea conditions where irregular waves act on the caisson. When the floating caisson without these tanks was subjected to head-on irregular waves in the actual sea area, it resonated with component waves close to its natural period, resulting in a larger pitch. However, the installation of the intersecting anti-rolling tanks reduced the frequency response of the pitch near the natural period more, and the floating caisson showed a high damping effect.</p>

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