Calculation of net shapes by the finite element method with triangular elements

Priour, Daniel

doi:10.1002/(sici)1099-0887(199910)15:10<755::aid-cnm299>3.0.co;2-m

Cited by 60 publications

(34 citation statements)

References 2 publications

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“…To avoid the problem of constrained numerical elements and axi-symmetry hypothesis, and to take into account further mechanical behaviours, a 3D Finite Element Method model of the net (FEMNET) based on a triangular element has been developed (Priour 1999(Priour , 2001). The triangle was chosen for being the simplest shape to describe a surface element.…”

Section: Codend Shapes Assessmentmentioning

confidence: 99%

“…This objective could have been fulfilled through extensive sea trials to cover all the different codend designs of interest. Due to the high cost of such trials we choose to perform sea trials with one reference codend design and then applied the computer-based codend selection simulation program PRESEMO (Herrmann 2005a) associated with the codend shape simulation model FEMNET (Priour 1999(Priour , 2001 to make predictions on what would be the effect of changing the design.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and theoretical study of red mullet(Mullus barbatus)selectivity in codends of Mediterranean bottom trawls

Sala

Priour

Herrmann³

2006

Aquat. Living Resour.

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The objective of this study was to investigate the effect on Mullus barbatus (red mullet) codend selectivity by increasing the codend mesh size or reducing the number of meshes in the codend circumference. This was performed through experimental sea trials and computer simulations. The sea trials were carried out in the Adriatic Sea using a polyamide codend in order to assess its selectivity, to record morphological (height, width and length) and population size structure parameters of red mullet (Mullus barbatus). The selectivity process in the codend was also simulated with an individual-based model (PRESEMO) and a finite element model (FEMNET) to calculate the codend shapes. By adjusting the behavioural description of red mullet in the simulation, the model results reached an agreement with the experimental results. Next these, behavioural parameters were used in the simulation model to predict the effect of changing mesh size and number of meshes around in new codend designs. The predicted effect and the benefit of enforcing these designs on catch efficiency below and above minimum landing size (MLS) were investigated. The results confirm that the reduction of number of meshes in the codend circumference will be more beneficial than increasing the mesh size.

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Section: Codend Shapes Assessmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental and theoretical study of red mullet(Mullus barbatus)selectivity in codends of Mediterranean bottom trawls

Sala

Priour

Herrmann³

2006

Aquat. Living Resour.

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“…The modeling is founded on the finite element method (FEM) model of the net based on a triangular element (Priour, 1999(Priour, , 2013a). The FEM model takes into account the inner twine tension, the drag force on the net due to the current, the pressure created by the fish catch in the codend, the floatability and weight of the net, the contact on the bottom, and the contact between knots of the netting, which limits the closure of meshes.…”

Section: Finite Element Modelmentioning

confidence: 99%

“…Here, the forces due to twine tension are described for the diamond and square mesh netting as described in Priour 1999 andPriour 2013a. All the twines of a triangular element are modeled as a bar made of isotropic and elastic material.…”

Section: Twine Tensionmentioning

confidence: 99%

An experimental/numerical study of the catch weight influence on trawl behavior

Priour

Prada

2015

Ocean Engineering

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Measurements at sea during fishing trials on bottom trawl have revealed that the geometry of the trawl is affected by the catch. A series of 37 hauls of around 3 h were carried out during the French EFFICHALUT project. The aim of this project was to carry out improvements on the fishing gear in order to reduce energy consumption. For this project, numerous sensors were used: for bridle tension, door spread, vertical opening, and door attitude. The measurements show quite clearly that the door spread decreases and the bridle tension increases during most of the hauls. The door spread decreased by 1.35 m/h, with a standard deviation of 1.98 m/h while the top bridle tension increased by 47 kg/h, with a standard deviation of 59 kg/h. The mean catch per haul was around 1.48 t. The modeling of the trawl gear and the catch with a FEM model helps to explain the variation in the door spread and the bridle tension: the numerical model shows a mean decrease of 1.06 m/h for the door spread and a mean increase of 76.0 kg/h for the top bridle tension. The modeling were developed by the first author in previous studies. Highlights ► Measurement at sea of a bottom trawl behavior. ► Measurements show that doors spread is affected by catch. ► Modeling of the bottom trawl with a FEM. ► Modeling of the catch in the trawl. ► The modeling fits pretty well with the measurements.

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“…The element can not describe the deformation outside of the membrane element. The twines only located and deformed along the side of the element, this great restricted the maximum size of the element and needed some additional elements to sufficiently describe the whole net construction [6][7].…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of the knotted nylon netting panel

Chen

2016

MATEC Web Conf.

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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.

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Calculation of net shapes by the finite element method with triangular elements

Cited by 60 publications

References 2 publications

Experimental and theoretical study of red mullet(Mullus barbatus)selectivity in codends of Mediterranean bottom trawls

Experimental and theoretical study of red mullet(Mullus barbatus)selectivity in codends of Mediterranean bottom trawls

An experimental/numerical study of the catch weight influence on trawl behavior

Numerical simulation of the knotted nylon netting panel

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