Study of the hydrodynamic characteristics of the trawl board

Abstract

The aim of the work is to prove the possibility of using software for calculating the hydrodynamic characteristics of trawl doors. The methods used: computer and physical modeling of the hydrodynamic characteristics of trawl doors makes it possible to set the correct angle of attack of the trawl for more successful catch. The search for optimal settings of trawl doors is possible using the computer program “Hydrodynamics of trawl doors”, which was developed on the basis of many studies of dynamic characteristics. Such characteristics include: current speed, depth, angle of attack, angle of heel and trim, maximum value of the spreading force coefficient cy, minimum value of the trawl door resistance coefficient cx, maximum value of the hydrodynamic quality k. Novelty: based on the results of physical and mathematical experiments, an analysis was carried out and a technique was developed that allows calculating the setting of trawl doors on a vessel without resorting to physical experiments on the water. Result: the developed methodology can allow harvesting technicians to correctly adjust the angle of attack of the trawl door on the vessel for the correct horizontal opening of the trawl, without resorting to testing on the water. Practical significance: based on the developed calculation methodology, mining technology specialists can adjust the angle of attack of trawl doors to achieve high fishing efficiency directly on the vessel, avoiding the need to conduct experiments on the water. Using specialized software, they can simulate various parameters such as the angle of inclination and dimensions of the trawl door, as well as environmental conditions. This will allow them to accurately predict the behavior of the board and optimize its settings, which ultimately contributes to an increase in catch and minimizes costs and work.