中層トロールシステムの静的特性の解析法

Abstract

Equilibrium differential equations of motion for a three dimensional midwater trawl system, which consists of warp, otter board and trawl net were introduced. A new analytical method that was solved from the side of net as initial conditions was developed. A computer simula-tion was made and the results were compared with those of the field experiments on the midwater trawl system of FRV “Shinyo-maru” belonging to the Tokyo University of Fisheries. There was good agreement between simulation and experiment on the working depth of the otter board and the net. However, in regard to the spread of wingend, it was observed that the difference between both increased with the warp length. This is supposed that the attack angle of otter board was not always settled in perfect condition.