Method for modeling single mid-water trawl net system in fishing vessel operating simulator

Abstract

The invention discloses a method for modeling a single mid-water trawl net system in a fishing vessel operating simulator. In the method, a mathematical model of the single mid-water trawl net system is divided into a trawler mathematical model and a fishing gear system mathematical model, the fishing gear mathematical model is divided into a trawl net mathematical model and a netting gear system mathematical model, and the coupling between the models is realized by utilizing boundary conditions. The method comprises the following steps: firstly, establishing a maneuvering mathematical model of a trawler; secondly, respectively establishing the trawl net mathematical model and the netting gear system mathematical model by a finite difference method and a lumped mass method, and realizing the coupling of the two by utilizing the boundary conditions between the models; and finally, realizing the coupling between the trawler mathematical model and the fishing gear system mathematical model by utilizing the boundary conditions to embody mutual influence of the two. The method can correctly reflect the interaction of a fishing vessel and a fishing gear system, dynamically simulate a net casting and drawing process of the fishing vessel, and also can embody the influence of the length change of the trawl net on the trawling position in the fishing process.

Description

technical field [0001] The invention relates to the application field of virtual reality and simulation technology, in particular to a modeling method of a single-boat mid-level trawling system in a fishing boat operation simulator. Background technique [0002] Using the fishing boat operation simulator to train the crew of the fishing boat, the crew can be trained in different fishing gear and fishing methods under various complex sea conditions, which not only shortens the training time, but also has no risk. In order to train the fishing crew on the single-vessel mid-water trawling method, it is necessary to establish a mathematical model of the single-vessel mid-water trawling system. [0003] In order to make full use of the power of the main engine under different operating conditions, most trawlers use controllable pitch propellers (CPP) as their propulsion methods. At present, scholars at home and abroad [1-6] Most of them use the open water test results of a seri...

AI Technical Summary

Problems solved by technology

[0005] The current mathematical modeling method of the single-vessel mid-water trawling system mainly has two defects: one is to use the approximate method to simplify the interaction between the fishing vessel and the fishing gear system, and the literature [8] assumes that the drag force of the trawler is linear with the dragging speed changes, it is difficult to correctly describe the maneuverability of fishing boats during trawling operations; second, in terms of mathematical modeling of the fishing gear system, the fishing gear system is regarded as a whole to establish its hydrodynamic model, which not only makes it impossible to carry out fishing boat retraction The dynamic simulation of the net process cannot reflect the influence of the length change of the drag class on the movement of the fishing gear system during the fishing process.

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