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一、绪言如果能从设计网图推算出各种底拖网的阻力和网口高度,这对网具设计是极有意义的。发表过有关这方面论文的有田内,小山、川上和山中等。因为涉及到操作条件等各方面因素,即使同类型网具,由于这方面理论不够完善,对设计人员研究网具是不够理想的。为完善这方面理论,首先画出底拖网拉紧长度和宽度的设计图,然后按通常方法将各部分网长进行缩结,按缩尺比再绘制出长度和宽度。在这基础上将拖网速度和两袖间距等设计上必须考虑的因素考虑进去,就可以求得拖网的阻力和网口高度的近
I. INTRODUCTION If we can deduce the resistance of various bottom trawls and the height of the net mouth from the design net map, it is very meaningful for the net design. Published papers on this field, there are fields, hills, Kawakami and Yamamoto. Because of the operational conditions involved and other factors, even if the same type of network tools, as this theory is not perfect enough for designers to study the network is not ideal. In order to perfect this theory, we first draw the design drawings of the length and width of bottom trawl tightening, and then shorten the length of each part of the mesh length according to the usual method and draw the length and width according to the scale ratio. On this basis, taking into consideration the design factors such as the trawl speed and the distance between two sleeves, we can find the resistance of the trawl and the near