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| Registros recuperados: 19 | |
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| Le Boulluec, Marc; Ohana, Jeremy; Chalony, Sebastien; Tancray, Aurelien; Le Gall, Clément; Fourestier, Gaspard; Santagostini, Timothée; Ercolanelli, Julien; Cueff, Quentin; Raoul, Samuel. |
| A method for reducing the roll of a ship consists in placing a tank whose liquid content is animated by free surface sloshing motions. The dynamic coupling with the vessel is studied experimentally at reduced model in a test tank. Numerical modeling under perfect fluid and viscous fluid assumptions make it possible to approach the measured responses. |
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| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00392/50352/51049.pdf |
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| Tassin, Alan; Breton, Thibaut; Forest, Bertrand; Ohana, Jeremy; Chalony, Sebastien; Le Roux, Dominique; Tancray, Aurelien. |
| We investigate experimentally the time evolution of the wetted surface during the lifting of a body initially floating at the water surface. This phenomenon is referred to as the water exit problem. The water exit experiments were conducted with transparent (PMMA) mock-ups of two different shapes: a circular disc and a square flat plate. Two different lighting systems were used to diffuse light in the mock-up material: a central high-power LED light normal to the surface and an edge-lighting system featuring an array of LED lights. These setups make it possible to illuminate the contact line, which delimits the surface of contact between the mock-up and the water. The characteristic size of the mock-ups is about 20 cm and the acceleration of the mock-up... |
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| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00392/50315/51074.pdf |
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| Ohana, Jeremy; Bourdier, Sylvain. |
| Marine energy devices are still at development stage and many models are being tested in the different hydrodynamics facilities. Improving the measurements quality of these tests by exchanging between the technical staff of the Marinet partners is one of the Work Package 4 objectives. This report is an experience feedback from Marinet tests. It was written mostly from Ifremer experience and aim to present the instrumentation techniques needed to carry out quality tank testing. The first part reviews the typical physical parameters to be measured, gives a short description of the sensors working principle and examples of implementations. The flow measurement section starts with wind measurement and a comparison of advantages and drawbacks of different... |
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| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00214/32572/31040.pdf |
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| Fonseca, Nuno; Pessoa, Joao; Ribeiro E Silva, Sergio; Le Boulluec, Marc; Ohana, Jeremy. |
| The paper presents the results of an experimental program with a scaled model of the UGEN wave energy converter (WEC). This concept has been developed by IST (Instituto Superior Técnico) based on a floating body with a U tank filled with water. The amount of water accounts for 40% of the floater displacement. The sway, heave and roll motion of the floating body coupled to the water oscillating in the U tube induce an oscillating air flow on the upper part of the U tank from one branch to the other through a circular tube. The aim of the device is to capture the air flow energy through a turbine. The natural period of the water in the U tank (circa 1.25 s) and of the resulting floating body natural rolling period (circa 1.9 s) are separated in such a way... |
| Tipo: Text |
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| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00170/28173/26407.pdf |
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| Harnois, V.; Weller, Sam D.; Johanning, L.; Thies, P. R.; Le Boulluec, Marc; Le Roux, Dominique; Soule, Veronique; Ohana, Jeremy. |
| The design of wave energy mooring systems is challenging: overdesign incurs a significant cost penalty, underdesign may lead to a premature failure and incorrect design could reduce the power production. Consequently, compliant mooring systems are being developed for wave energy applications. This paper presents tank test results for a scale model of the buoy and mooring used at the SouthWest Mooring Test Facility (SWMTF), an offshore facility developed to conduct long-term sea trials for wave energy device moorings. A compliant three leg catenary mooring system using Nylon ropes in the water column is investigated. Preliminary static, quasi-static, decay, regular and irregular wave tests were conducted on the 1:5 scale model, using the Ifremer basin in... |
| Tipo: Text |
Palavras-chave: Wave energy converter; Tank tests; Numerical model; Highly dynamic mooring system; Fibre rope. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00233/34375/35785.pdf |
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| Tancray, Aurelien; Ohana, Jeremy; Priour, Daniel. |
| Ces essais se déroulent dans le cadre de la thèse du Dr LODDE sur l’impact d’une plongée sur le corps humain. Suite à un protocole bien défini, des médecins feront divers analyses sur les plongeurs avant et après immersion. 16 plongeurs ont été reçus sur 2 jours : 8 palanquées de 2. Chaque plongeur passe par des examens médicaux avant plongées : EFR, laser doppler, tension, prise de sang. Après une plongée de 40 minutes à 20m, le plongeur recommence les examens. Les médecins seront ainsi en mesure, sur un échantillon de plongeurs désignés (age, sexe, poids, taille différents), de déterminer l’influence d’une immersion sur le corps humain. |
| Tipo: Text |
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| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00343/45457/45006.pdf |
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| Registros recuperados: 19 | |
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