Development of a method for numbering the knots and bars of netting
2004
Kubo, S. (National Research Inst. of Fisheries Engineering, Hasaki, Ibaraki (Japan))
Abstract In the field of fishing, there have been several traditional uses of netting (fishing nets) seen over the years . To achieve further development and improvement, experimentation using a field survey or tank test is required. Recently, some attempts at numerical simulation to determine netting movement have taken place. In numerical simulations of this type, each knot and twine(bar) of the netting must be numbered. Generally, when a net texture is laid flat, the knots and bars of the net are ,placed in orderly rows. Therefore, in the case of simple net-texture shapes, this work is not too difficult and can even be done manually. However, if this work could be done with a computer, the task of numbering various net shapes would become easier and faster. This document is a report on a method for numbering the knots and bars of variously shaped net textures with a computer by applying Cauchy's integral formula in a complex number field. After numbering is completed using this method, the data is processed in order to obtain a form that can be used for numerical simulation. Also, one example of seasurface crawl-netting moored by ropes is shown in the first paragraph of the computer simulation.
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