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A method for estimating the gear shape of a mid-water trawl

机译：一种估计中水拖网齿轮形状的方法

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摘要

An estimation of the shape of the gear (gear shape) during a mid-water trawl and the angle of attack of a cambered otter board can be achieved by implementing a three-dimensional semi-analytical treatment of the towing cable (warp) of a trawl system. This can be achieved by processing the field data obtained using the Scanmar system. The shape of the hand rope, bridles and head (or foot) rope attached behind the otter boards in a horizontal plane was assumed to be a function of the form y_r = Ax_r~B. The distance between otter boards (otter board spread) estimated using the three-dimensional analysis of a towing cable system should be equal to that obtained using the functional equation. The shape of a trawl net from wing end to bag net was assumed to be of the form x~2 /a_e~2 + y~2/b_e~2, = (z - c)~2/c~2, i.e., as part of an elliptic cone. The volume covered by the trawl net, the ratio of vertical radius to horizontal radius of the ellipse, the contribution of the side panel to net height and the inclination angle of the head rope (float line) according to towing speed were obtained. The angle of attack of a cambered otter board could be obtained by calculating the equilibrium of forces and moment around the otter board.
机译：可以通过对渔船的拖缆（经线）进行三维半分析处理，来估算中水拖网期间的齿轮形状（齿轮形状）和弧形水獭板的攻角。拖网系统。这可以通过处理使用Scanmar系统获得的现场数据来实现。假设水獭板后面的手绳，bri绳和头（或脚）绳的形状在水平面内是y_r = Ax_r〜B的函数。使用拖曳电缆系统的三维分析估算的水獭板之间的距离（水獭板展开）应等于使用功能方程式得出的距离。假设从机翼端部到袋状网的拖网的形状为x〜2/2 / a_e〜2 + y〜2 / b_e〜2的形式，即（z-c）〜2 / c〜2，即作为椭圆锥的一部分。根据拖网速度获得了拖网的体积，椭圆的垂直半径与水平半径之比，侧面板对网高的贡献以及头绳（浮线）的倾斜角。通过计算水獭板周围的力和力矩的平衡，可以得出水獭板的攻角。

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