底曳網漁船の曳網時の運動性能に関する模型実験

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Model tests were carried out on ship motions in regular waves and turning characteristics of a 124 tonnage type stern trawler under the condition of trawling as well as running alone. The trawling condition was simulated by towing a body with the resistance equivalent to one estimated for the real net. The results showed that the ship motions such as pitch, heave and surge in head waves and following waves were little affected by trawling, but that the roll motion in beam waves was decreased because of the increase of the damping. It was also shown that the turning ability was remarkably decreased by trawling and that the heel in turning under trawling occurred in opposite direction to the case of running alone. The turning ability was improved by shifting the outside warp to the inside one, which corresponded to the common practice of loosing the outside warp to make easier turning of a real ship under trawling. The surge motion of the self-propelled model alone in the following regular waves was examined and it was proved that as the encounter frequency tended to zero the surge amplitude was remarkably increased, for example as much as 13 times of the wave amplitude, and that if the model speed or the wave height was increased somewhat after that, then the model was caught by the wave and fell into the surf-riding condition. It was moreover shown that the estimation of ship motions by the strip method was not so good as ordinary ships, probably due to the effect of a large and shallow draft stern.
独立行政法人海上技術安全研究所の論文
1987-07-30

底曳網漁船の曳網時の運動性能に関する模型実験

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