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| Gilbert, Olivier; Langlais, Mickael; Delbart, Franck; Bourjaillat, Bastien; Piard, Luc; Dussud, Loic; Delauney, Laurent. |
| The ENVRI community (Environmental and Earth System Research Infrastructures) covers multiple scientific domains, such as oceanography, atmosphere, geophysics and biology. Whilst very different in terms of scope and technology, the research infrastructures and their personnel face common technical challenges related to the fact that field equipment is often installed in remote sites. Specifically, a large proportion of field equipment needs to be autonomous and sometimes operates in extreme conditions. Theme 1, “Technical innovation”, aims to provide and improve the technology used by environmental RIs by developing internal cooperation synergy and by collaborating with the industries that propose solutions for RIs. WP3, “Improving measurement networks:... |
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| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00630/74252/73883.pdf |
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| Bourillet, Jean-francois; Damy, Gilbert; Dussud, Loic; Sultan, Nabil; Woerther, Patrice; Migeon, Sebastien. |
| Various observations pointed out that cores performed with gravity piston corer show signifi cant distortions mainly located at the top of the core. A series of 15 cores were performed at the same location on a submarine sand wave (Var canyon, France). Six different settings of the corer – three freefall heights and three slacks of the piston cable – were tested, including duplicates. Two accelerometers recorded simultaneously the movements of the core tube and the movements of the triggering arm. Then the z displacements were obtained by a double integration versus time of the measured acceleration. The analyses of results allowed the authors to estimate the amplitude and the duration of the elastic recoil of the aramid cable, andto distinguish four steps... |
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| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/00071/18198/15766.pdf |
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| Davies, Peter; Reaud, Yvan; Dussud, Loic; Woerther, Patrice. |
| This paper describes the mechanical behaviour of ropes used for deep sea oceanographic operations. First the requirements of deep sea handling ropes are presented. Two high performance fibres are commonly used, aramid co-polymer and high modulus polyethylene (HMPE), and these are then compared. Results from tests on single fibres and 50 ton break load braided ropes are presented, which show that the initial stiffness of a new HMPE rope increases with load level in a bedding-in process resulting from both molecular alignment and construction reorientation. The aramid rope is less sensitive to this effect and shows a high stiffness from first loading. Measurements made at sea on oceanographic ropes of both materials using an elastic recoil method are... |
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Palavras-chave: Fibre rope; Deep sea coring; Stiffness; Aramid; HMPE. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00054/16573/14068.pdf |
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| Carotenuto, Federico; Delauney, Laurent; Dussud, Loic; Gioli, Benamino; Turpin, Victor; Zaldei, Alessandro. |
| Unmanned vehicles (UVs) are mobile platforms that can be either piloted remotely, either move autonomously using certain degrees of onboard/online intelligence. These kinds of platforms are progressively getting cheaper and accessible and they are penetrating more and more also in the world of scientific research. UVs in fact allow to investigate areas that are hardly accessible (or hazardous) for human researcher, and they are especially relevant for atmospheric, biosphere and marine domains since they allow spatialized sampling in terms of vertical profiles, horizontal transects or a combination of both. Unfortunately, the legislation regulating the usage of these kind of platforms are not moving as fast as their technical development and their spreading... |
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| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00630/74250/73880.pdf |
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