強制係留された球形浮体の波浪中の運動

概要

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A floating fisheries bank is a floating body of a distinctive shape, which is moored by a single line in the middle layer of sea. Its function is to gather the migratory fish and surface and middle layer fish. Though they were developed only a few years ago, many floating fisheries banks are being utilized and they are regarded as highly efficient, but there may be many ways to further improve on design and function.In this study we use the forced moored sphere as the most basic type of the floating fisheries banks. Analytical and experimental investigation of the sphere motion and the mooring forces in water waves were carried out. Analytically, especially from a fisheries point of view, we paid attention to the following two points: 1) Compared to the net buoyancy of sphere, the vertical wave force is big enough; 2) Newtons law concerning hydrodynamic drag is applied to the damping force. From these, we then deduced a nonlinear forced vibration equation. An approximate solution of it was obtained by using Fouriers expansion. In order to confirm the result, we did some experiments in the wave tank varying the wave period, wave height, diameter of sphere, density of sphere, and length of the mooring rope. The results calculated from the above equation were in good agreement with the experimental values.
公益社団法人日本水産学会の論文