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The geometrical gear shape of a bottom trawl

机译：底拖网的几何齿轮形状

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An estimation of the gear shape during a bottom trawl can be achieved through geometrical modeling of the trawl system. This can be implemented by processing the field data obtained using the Scanmar system. The gear shape from the square through the bag net was assumed to be the upper and lower parts of different elliptic cones of which the cross section was an ellipse and the shape of the float rope to be of exponential function. A system of nonlinear equations was constructed to represent the gear shape of the bottom trawl net in water. When the equations were solved based on the data obtained from bottom trawl experiments with various warp lengths, the cross section of sweep and filtered volume, the eccentricity of the upper ellipse, the functional shape and inclination angle of the float rope, and the contribution of the upper side panel to the net height could be obtained in relation to towing speed and scope ratio. As the cross section of sweep at the mouth and the projected total cross section decreased a little bit with increased towing speed, the filtered volume tended to increase with increased towing speed. The gear shape at mouth of the bottom trawl was not so much changed compared to that of a mid-water trawl.
机译：可以通过拖网系统的几何建模来估算拖网期间的齿轮形状。这可以通过处理使用Scanmar系统获得的现场数据来实现。从正方形到袋子网的齿轮形状假定为横截面为椭圆形的不同椭圆锥的上部和下部，并且浮绳的形状具有指数函数。构造了一个非线性方程系统来表示底部拖网在水中的齿轮形状。当根据从底部拖网实验获得的数据（具有不同的经纱长度，扫掠和过滤后的体积的横截面，上椭圆的偏心率，浮子绳的功能形状和倾角以及水的贡献）求解方程组时，相对于拖曳速度和范围比，可以得到净高的上侧板。随着拖曳速度的增加，口部掠过的横截面和预计的总横截面会略有减少，因此，随着拖曳速度的增加，过滤后的体积趋于增加。与中水拖网相比，底拖网口处的齿轮形状变化不大。

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