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A mathematical model for the determination of the shape and the tensions of a trawl placed in a uniform current ArchiMer
Theret, Francois.
The determination of trawls shapes and tensions is a very complex problem. At this time only the static aspect has been considered, the trawl being placed into a uniform current. Three types of difficulties have been met : - Firstly, the hydrodynamic behaviour of the meshes is not well known ; - Secondly, a net is a complete flexible structure with no own shape unless submitted to the action of external forces, but so we are facing an actual " fluid-structure interaction" problem ; - Thirdly, a flexible reticulate structure is made of an anisotropie and discontinus material. ln this paper, the net studied is a trawl for which, the only parameters known are the drawing and the characteristics of the cables which link it to the trawler. The method that we...
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Ano: 1994 URL: http://archimer.ifremer.fr/doc/00394/50578/51269.pdf
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Etude de l'équilibre de surfaces réticulées placées dans le courant uniforme. Application aux chaluts ArchiMer
Theret, Francois.
La détermination des formes et tensions d'une structure souple réticulée en équilibre dans un courant uniforme est un problème complexe. Dans cette étude, la structure considérée est un chalut dont seul le plan de coupe est, a priori, connu. La méthode itérative proposée permet de calculer les efforts hydrodynamiques exercés sur les côtés des mailles et la forme d'équilibre prise par le filet. Les difficultés de cette étude sont de trois ordres: - le comportement hydrodynamique des mailles de filet est mal connu. - un chalut est une structure infiniment souple qui n'a pas de forme propre, seule l'action des forces extérieures lui permet de prendre une certaine configuration. Mais ces forces dépendent elles-mêmes de la forme prise par le filet; nous devons...
Tipo: Text Palavras-chave: Efforts hydrodynamique; Panneau; Filet; Surface souple; Structure; Couplage fluide structure; Surface réticulée; Maille; Chalut.
Ano: 1993 URL: http://archimer.ifremer.fr/doc/1993/these-6930.pdf
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Etude numérique du train de pêche d'un chalutier (DEA) ArchiMer
Theret, Francois.
IFREMER aims at digitalizing trawl gear in order to reach two goals: on the one hand, participating in the realisation of a computer assisted trawl conception software; on the other hand, being able to study quickly and easily the influence of different adjustment parameters on the shape of the trawl in order to indicate to the skipper, if possible in real time, the optimal adjustment for the conditions he's in. From an international point of view, there are only two strategies to approach this problem: - the first strategy is based on statistical studies on the existing nets (almost limited to their reproduction on different scales), but this approach does not leave much room for innovation as it can only be applied to the same type of nets as those that...
Tipo: Text Palavras-chave: Experimentation; Optimization; Adjustment; Hydrodynamic; Modelization; Trawl gear; Trawl; Expérimentation; Maquette de chalut; Optimisation; Réglage; Hydrodynamique; Modèle numérique; Train de pêche; Chalut.
Ano: 1990 URL: http://archimer.ifremer.fr/doc/1990/these-3627.pdf
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