垂下した魚礁ブロックの水中における振動について

概要

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A fish reef block model (a sphere and a cube were also used as the simple artificial reef models) was swung by a wire string from a fixed point with an initial angle in still water. Free-damped oscillation curves which were measured for different lengths of the string, were compared with the curves obtained by solving a differential equation of motion. In the solution a graphical method of trajectory on a phase plane was used.The experimental curves fitted well in the calculated ones for the first 1/4 period in every oscillation. Therefore, we applied this method to the actual fish reef block hung by a wire rope from a derrick barge and estimated the length of the wire rope resonant with the rolling period of barge while installing the fish reef block in sea water. The results suggest that the resonance hardly occurs when the fish reef block is in the water, but it may easily occur in the air.
日本水産學會の論文