Abstract
This paper analyzes mathematically the dynamic properties of a midwater trawl system which is composed of a trawler, trawl net, otter boards and warp. Taking the midwater trawl system of “SINYO Maru” of the Tokyo University of Fisheries as an example, the effects of changing towing speed and warp length on the system dynamics are demonstrated. The “overshoot” phenomenon caused by sinking of the otter board while lengthening the warp is clearly explained.
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