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Method for optimizing trawl in net water filter volume of unit energy consumption

A technology of unit energy consumption and net gear, applied in fishing nets, fishing, applications, etc., can solve problems such as ignoring net gear, and achieve a concise and effective effect

Inactive Publication Date: 2010-06-09
EAST CHINA SEA FISHERIES RES INST CHINESE ACAD OF FISHERY SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main problem of this method is that it ignores the relationship between the energy consumption of the net during the dragging process and the water filtration volume of the net.

Method used

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  • Method for optimizing trawl in net water filter volume of unit energy consumption
  • Method for optimizing trawl in net water filter volume of unit energy consumption
  • Method for optimizing trawl in net water filter volume of unit energy consumption

Examples

Experimental program
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Embodiment Construction

[0024] Taking the 441kw double-bottom trawl as an example, let the production net of the original mother net size of 300m×132.66m / 73.6m be the A net, and the newly designed trawl net be the B net. The main dimensions and structural parameters of each net are shown in Table 1 and Table 2 :

[0025] Table 1: Comparison Table of Main Scales and Parameters of Network A and Network B

[0026] kind

type

Specification

S 1 (m)

S 2 (m)

S 1 / S 2

C(m)

l w / C

L s / C

L b / C

A

200 ◇ ×1500mm

73.6

85.62

0.86

300

0.087

0.027

0.263

B

120 ◇ ×3000mm

79.7

93.6

0.856

360

0.083

0.025

0.212

[0027] Note: C-network port perimeter, S 1 -The length of the float, S 2 -Sink length, l W - upper sleeve length, l s -Length of the mesh cover, l b - Mesh body length.

[0028] Table 2: Technic...

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Abstract

The invention discloses a method for optimizing a trawl according to net water filter volume of specific energy consumption, relates to a method for optimizing a trawl fishing tool, and provides the method for optimizing the trawl according to net water filter volume of specific energy consumption. The technical scheme is realized according to height of a net opening, sleeve end distance, a shape coefficient of the net opening, net resistance and dragging speed. The method is characterized in that the optimal trawl is determined by the net water filter volume (M) of specific energy consumption, involving the following parameters: H-height (m) of the net opening, W-sleeve end distance (m), f-shape coefficient of the net opening (commonly 0.8), R-net resistance (tf) and v-dragging speed (knot) in the formula; the larger the M value is, the higher the net performance is; and the optimal trawl corresponds to a maximal value of a performance criterion M in such a way of M(xr)-max.

Description

technical field [0001] The present invention relates to an optimization method for trawl fishing gear. Background technique [0002] Trawl fishing gear is a flexible body composed of a variety of flexible materials (nets, wires, etc.), and moves under relatively complex external conditions. Its unfolded shape and stress are more complicated. Mathematical relationships are extremely complex. For this reason, domestic and foreign still generally adopt experience method to design trawling gear so far. The design of trawl fishing gear is mainly to determine the form and main scale of fishing gear according to factors such as fishing vessel scale, operation form, fishing machinery and equipment, fishing ground conditions, and biological characteristics of fishing objects. However, depending on the demonstration of the technical performance of the trawl, meeting the requirements set out in the design brief may be achieved in different ways. Such as choosing different fishing ge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01K73/02
Inventor 王明彦徐宝生郁岳峰陈雪忠项忆军
Owner EAST CHINA SEA FISHERIES RES INST CHINESE ACAD OF FISHERY SCI