Метод расчета силовых и геометрических характеристик закидного равнокрылого невода в квазистатической постановке

Abstract

The process of sampling a beach winged seine (BWS) is complex, it occurs with a change in geometric and power characteristics that are interrelated and depend on each other. Solving problems of this level of complexity is possible only with the help of discrete methods, using computers. However, in order to take operational actions of the fishing crew to adjust the rigging, the sampling rate of the cuts and when making structural changes to the grid part of the BWS, it is necessary to promptly solve the tasks of determining geometric and power characteristics. In this regard, it is possible with a small error (no more than 10%) to determine the effort in the process of sampling the cuts at the appropriate tone based on a quasi-static process. If each quasi-static state of the BWS is close to the equilibrium state and, since the sampling rate of the cuts is small, then it is customary to use the V–axiom of statics - the transfer of forces is possible only along the line of action of the force itself. If, on the other hand, we determine the relationship of the shape of the BWS with the acting forces, then, taking into account the equation of the sum of the moments of forces relative to the point of fixing the edges, it is possible to determine the geo-metric parameters of the entire BWS as a whole. This condition is necessary, but insufficient, and additional conditions are required in each specific case. These conditions are the temporary areas of the “melting” of the BWS. A method for calculating the geometric and power characteristics of the 451 × 4.5 m BWS is given, and an example of the calculation used for catching hydrobionts of the Northern Caspian is also given.