Abstract
A piece of netting, consists of the 8 8 meshes, fixed on a square frame, was simulated and the tensions and their distribution, the positions of knots and netting shape were calculated by means of MATLAB in computer. The dynamic mathematic model was developed based on lumped mass method, the netting was treated as spring-mass system, the Runge-Kutta fifth-order and sixth-order method was used to solve the differential equations for every step, then the displacement and tension of each mass point were obtained. For verify this model, the tests have been carried out in a flume tank. The results of the numerical simulation fully agreed with the experiments.
Highlights
In fishing gear design and operation performance improvement, the drag, tension distribution and shape has directly affected capture efficiency and energy consumption
Netting panels are the basic composition of fishing gear system and aquaculture facilities such as trawl and purse seine, so the hydrodynamic performance of netting panel is the important content of the fishing gear performance study
The primary study was compatible with the flume tank measurements
Summary
In fishing gear design and operation performance improvement, the drag, tension distribution and shape has directly affected capture efficiency and energy consumption. The three dimensional numerical netting model was established to calculate and estimate the shapes, inter-tensions and their distribution[10]. Li et al developed a numerical model based on lumped mass method to set up the motion equations for rectangle and diamond meshes. Hosseini et al refined the massspring method to consider the drag coefficient as a function the Reynolds number and the attack angle in order to build the numerical model for the purse seine gear and attain the sinking performance of different designs and netting materials[17]. The diamond meshes are applied widely, and the hydrodynamic performance of netting panel is the important component of the netting gear study. We built the mathematical-mechanical model to simulate the space shape and tension distribution of the diamond meshes. K is the stiffness of the mesh bar. l0ij and lij are the original length and deformed length between mass points i and j, respectively
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