実船試験による漁船の耐航性について-VIII : 漁法の相違による船体運動特性

抄録

The most important purpose of the operation of a fishing boat is fishing. Therefore, the motion of the fishing boat during operation should be studied by putting collectively the relations among the waves, the hull, and the fishing gear and methods. This paper deals with the characteristics of the ship's motion shown by the difference in fishing methods, that is, the difference in the trawling speed and the distance between the ships of a bull trawler, and following results were obtained. 1) The motion of a ship trawling in the beam sea increased the amplitudes of rolling and heaving in proportion to the increase in the trawling speed. 2) The changing of the amplitudes of warp tension took the Gaussian distribution, and the maxima of warp tension were distributed according to Rayleigh's distribution functions. 3) As the results of the cross spectrum analysis of the fishing gear system with warp tension as input and the ship's motion as output, the larger the distance between the ships was, the higher the response amplitude gain was in all the cases of rolling, pitching, and heaving, when trawling speed was equal and the distance between the ships was different. And in this case, the coherency was high and the phase difference was small.