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Registros recuperados: 31
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Apex, actively positioned exploration system. ArchiMer
Greger, B.
A conceptually new, modularly designed exploration system for the deep sea (600 m) has been constructed and tested. In its base unit, different soil sampling tools can be integrated. These are, for the time being, a drill core barrel with 0 48 mm iD and a length of 500 mm for rocky basements as a box corer for softer soils as well as an orange peel grab. Towed along via a coaxial cable from a research vessel, the system is TV-guided and can be actively positioned by means of 2 thrusters in order to be lowered precisely and horizontally levelled on the seafloor. The total system is operated by the help of an onboard computer and may be controlled by sensor displays and operation messages. Microprocessors control the underwater unit which is partially...
Tipo: Text Palavras-chave: Marine technology; Mineral exploration; Towed vehicles; Research vessels; Geology; Ocean floor.
Ano: 1990 URL: http://archimer.ifremer.fr/doc/1990/acte-1158.pdf
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Application du laser a la detection sous-marine: Experimentation d'un imageur ArchiMer
Kervern, G; Legall, A.
Nowadays, side-looking sonar is the only equipment able to carry out long-range underwater imaging. The use of optics is limited to short-range identification by means of conventional video-cameras. However, active optical systems (lidars) manufacturing, using a blue-green laser, will enable optics to hold its place in the field of long-range underwater imaging. After a short comparison between acoustics and optics in underwater detection and a description of the proper features of underwater optical propagation, we present the different conceivable imaging principles and propose a method to determine their performances. The experimentations described concern a lidar imager mock-up using one of the imaging principles proposed. The pictures obtained deal...
Tipo: Text Palavras-chave: Optics; Lasers; Detection; Acoustics; Underwater cameras; Sonar imagery; Imaging techniques; Underwater photography; Marine technology; Side scan sonar.
Ano: 1990 URL: http://archimer.ifremer.fr/doc/1990/acte-1139.pdf
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Balise intelligente pour mesure scientifique ArchiMer
Guillerm, G.
MORS ENVIRONNEMENT has developed for the University of Hawaii a new system, SI 4X1-3, for study of movement of tectonic plate. In a single unit are gathered an acoustic rangemeter, a data acquisition unit (for 8 external sensors), a long range telemetry, and a power pack for 6 to 10 years life. The surface unit is a standard 16 frequencies RM 201 "OCEANO INSTRUMENTS" rangemeter. The programmation, the data transmission control, and the exploitation of the measures are done with a compatible IBM/AT. This system includes the know-how of SUBER and OCEANO INSTRUMENTS, and finds today a very large application field: Control and command of instrumented closing pigs; Seawater quality control without buoys and transmission up to 8 km; Corrosion control on platform...
Tipo: Text Palavras-chave: Acoustic equipment; Marine technology; Plate tectonics.
Ano: 1990 URL: http://archimer.ifremer.fr/doc/1990/acte-1169.pdf
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Besoins en technologie de l'archeologie sous-marine ArchiMer
Tchernia, A; Pomey, P.
Underwater vehicles are used to discover the wrecks, and the author deals with the using of the new marine technology in the archaeology.
Tipo: Text Palavras-chave: Underwater equipment; Archaeology; Marine technology.
Ano: 1990 URL: http://archimer.ifremer.fr/doc/1990/acte-1170.pdf
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Concevoir des structures pour l'élevage des poissons en mer ArchiMer
Priour, Daniel.
The quick evolution of fish farming in Europe, and its development towards the open sea needs suitable farming tools. These tools must withstand the difficult sea states, but they must be easy to use, well adapted to the fish farming and not too much expensive. This book helps the design of such tools. It defines the solicitations of the sea on all the structures, and presents rules and methods to control these solicitations. Here, a structure is composed of a rearing support, a mooring system and equipments. This book describes these components, class them and gives lists of providers. The rearing support can be a cage, a group of cages or a boat. The support can float or to be submersible. The mooring system can be made up ropes, chains, anchors,...
Tipo: Text Palavras-chave: Aquaculture equipment; Mooring systems; Anchoring; Aquaculture techniques; Structures; Sea water; Life support systems; Aquatic environment; Cage culture; Marine technology; Rearing; Fish culture.
Ano: 1995 URL: http://archimer.ifremer.fr/doc/1995/rapport-1667.pdf
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Controle commande d'un robot sousmarin ArchiMer
Durand, D; Domingo, J; Levallois, E.
This system is composed of a high accuracy hydraulic manipulator arm with 6 degrees of freedom, for high loads (2000 daN), using ultrasound proximetry and contact force measurement data to carry out the subsea connection of bottom oil wells. An expert system controls the connection phases and generates the sequences of commands to be executed by the robot. The safety systems and failure modes are also taken into account. A graphic operator station provides easy control. Each connection phase generates a graphic representation of the robot status and all the proprioceptive and exteroceptive sensors. The control/command system, although it is designed to carry out a subsea connection by means of a manipulator arm, can be adapted to any type of process. For...
Tipo: Text Palavras-chave: Marine technology; Acoustics; Connecting; Connectors; Oil wells; Sensors; Hydraulics; Robots; Manipulators.
Ano: 1990 URL: http://archimer.ifremer.fr/doc/1990/acte-1155.pdf
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Deep diving service submarines ArchiMer
Freitas, A.
Service submarines have been developed for support duties in offshore operations in deep waters. Three submarine concepts have been designed for water depths ranging from 400 to 1500 m. The operation philosophy is to use an autonomous manned submarine as a carrier for components, tools and work modules and as a base for IMR operations on subsea installations. The design principles are similar to that of the Space Shuttle incorporating a payload bay, energy supply and a closed environment for the crew and operators. The operation profile of an offshore submarine demands capabilities above those of naval submarines: deep diving, long endurance underwater, dynamic positioning. New technology had to be developed: air-independent energy system, regenerative...
Tipo: Text Palavras-chave: Dynamic positioning; Marine technology; Diving; Offshore equipment; Offshore operations; Underwater inspection.
Ano: 1990 URL: http://archimer.ifremer.fr/doc/1990/acte-1165.pdf
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Detection de fissure sur structure en mer en presence de salissure marine projet "Crabe" ArchiMer
Daste, S.
The "CRABE" method is a crack detection technique based on the use of low electromagnetic frequencies. This (patented) method relies on a global injection of current within the structure under inspection. The presence of a crack shall cause a disruption in the current flow, and consequently of the magnetic field off the surface in the vicinity of a defect. It is this magnetic signature which is detected by the magnetic sensor used with "CRABE". The major advantage of this process, developed by TRAVOCEAN and the LETI Division of CEA with the help of IFREMER, appears clearly: No preliminary cleaning of the welds to be inspected is required, since no contact is necessary. Similarly, it shall be possible to inspect the whole of structures to a total cost all...
Tipo: Text Palavras-chave: Offshore structures; Fouling; Underwater exploration; Steel structures; Sensors; Cracks; Detection; Unmanned vehicles; Marine technology.
Ano: 1990 URL: http://archimer.ifremer.fr/doc/1990/acte-1161.pdf
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Etat de l'art des véhicules sous-marins autonomes, verrous technologiques ArchiMer
Michel, J; Duranton, R.
Autonomous Underwater Vehicles, also called "free-swimming vehicles" are self propelled bodies, equipped with their own energy package and with no solid communication link with the surface. At the beginning of the 90s, a renewed interest from the Underwater Intervention Community for autonomous vehicles and quite a number of new projects were announced or started. The present paper aims at presenting an updated State of the Art on the development of autonomous vehicles. It addresses the following points: A brief historical review presents some existing systems and uses. The French experience, in particular, allows to position the potential, and complementary contribution of autonomous vehicles, in a range of various operational systems. A short review of...
Tipo: Text Palavras-chave: Design; Research; Research programmes; Historical account; Marine technology; Free swimming vehicles.
Ano: 1990 URL: http://archimer.ifremer.fr/doc/1990/acte-1135.pdf
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Evolution des concepts d'exploitation miniere en mer ArchiMer
Bivaud, J.
At present, offshore placers are generally exploited by means of traditional dredging equipment. This technique, called the "vertical method," consists of working the seabed directly from the surface support vessel through a rigid upflow pipe equipped, when necessary, with a sediment preloosening system. In contrast with the vertical method, this approach is based on the principle of working along the seabed with transfer of spoil up to the surface after extraction. We therefore call this the "horizontal method." Although it varies according to sites, in most cases this method comprises the design of a vehicle, self-propelled to some degree, which moves along the seafloor, carries and operates the appropriate mining tools and includes a system to transfer...
Tipo: Text Palavras-chave: Offshore operations; Marine technology; Unmanned vehicles; Mining vessels; Placers; Deep sea mining.
Ano: 1990 URL: http://archimer.ifremer.fr/doc/1990/acte-1168.pdf
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Geological sampling in deep water: A new instrument is necessary. ArchiMer
Girardeau, J; Auzende, Jean-marie; Boillot, G.
The Nautile submersible is used to observe the underwater geological structures and to conduct geological sampling in deep water. But it is not sufficient because it is not possible to measure the faults in the oceanic rifts.
Tipo: Text Palavras-chave: Faults; Palaeomagnetism; Tectonics; Submersibles; Surveying underwater; Surveys; Seafloor sampling; Marine technology; Deep water.
Ano: 1990 URL: http://archimer.ifremer.fr/doc/1990/acte-1154.pdf
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Guide to oceanographic and marine meteorological instruments and observing practices OceanDocs
Tipo: Book Palavras-chave: Oceanography; Marine technology; Meteorological instruments; Meteorological data; Meteorological observations; Oceanographic equipment; Oceanographic surveys; Sea surface; Temperature measurement; Salinity measuring equipment; Bathythermographs; Thermometers; Wave measuring equipment; Wave measurement; Wind measurement; Wind measuring equipment; Swell; Atmospheric pressure; Water colour; Water transparency; Meteorological instruments; Meteorological observations; Thermometers; Atmospheric pressure; Meteorological data; Http://aims.fao.org/aos/agrovoc/c_4779; Http://aims.fao.org/aos/agrovoc/c_4780; Http://aims.fao.org/aos/agrovoc/c_7721; Http://aims.fao.org/aos/agrovoc/c_693; Http://aims.fao.org/aos/agrovoc/c_34149.
Ano: 1975 URL: http://hdl.handle.net/1834/2676
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Gullfaks C offshore operation: Use of an hybrid team in subsea construction work: The Gullfaks "C" and oseberg north projects (use of the ROV). ArchiMer
Rougier, R.
Installation and tie-in using tig automatic hyperbaric welding of 3 expansion loops to the Gullfaks "C" gravity base platform at 220 meters in the Norwegian sector of the North Sea. Operation performed from a dynamically positioned diving support vessel using divers and construction ROV during the summer 1989. Facing the technological challenge created by the deep diving aspects, the technical difficulties of doing welding operation at this depth, and the tight commercial constraints, a review of the tasks was conducted to optimize and reduce the offshore time, leading to innovations in the procedures selected to perform the work: Use of a working ROV, assisted by an observation vehicle, to carry out subsea tasks traditionally reserved for construction...
Tipo: Text Palavras-chave: Diving; Offshore structures; Robots; Divers; Welding underwater; Offshore engineering; Unmanned vehicles; Marine technology; Offshore.
Ano: 1990 URL: http://archimer.ifremer.fr/doc/1990/acte-1162.pdf
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Hypson 400, a real time panoramic sonar. ArchiMer
Monsaingeon, L.
The search for a panoramic, real-time, high frequency sonar has been a major goal for operating ranges where optical systems have established limitations. HYPSON 400 meets such requirements and provides a simultaneous and continuous beam-forming, no-scanning, wide opening system, using a hybrid beam-forming technique allowed by new component technologies. Up to seven images per second can be formed at a range of 100 meters, and more at shorter distances, as allowed by the speed of sound, thus providing the highest possible rate of information renewal required by operations at sea.
Tipo: Text Palavras-chave: Instruments; Sonar imagery; Marine technology.
Ano: 1990 URL: http://archimer.ifremer.fr/doc/1990/acte-1156.pdf
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Instabilites sous-marine etudiees par submersibles ArchiMer
Savoye, Bruno.
Sediment instability appears to be important as a part of global sedimentary budget. Among the various types of sedimentary instabilities, submarine slides are probably the most spectacular and the hardest to study and predict, although their consequences on human and industrial marine activities can be dramatic. IFREMER is conducting a research project on this topic. An area off Nice (France) has been particularly studied because of its recent activity. Mapping and instability area detection have been carried out. With the possibility of direct interactive observation and highly accurate submarine in -situ operation, the submersible is an extremely efficient tool for sediment studies, but diving purposes have to be precisely defined to provide useful...
Tipo: Text Palavras-chave: Sediments; Instability; Sedimentology; Sedimentary structures; Ocean floor; Marine technology; Geology; Submersibles; Unmanned vehicles.
Ano: 1990 URL: http://archimer.ifremer.fr/doc/1990/acte-1150.pdf
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Laser imaging technology for subsea inspection: Principles and applications (and use of the ROV). ArchiMer
Klepsvik, J; Torson, H; Thoresen, K.
Recent advances in solid state green laser technology offers a unique possibility for developing compact, low power instruments for high-resolution underwater 3D imaging and surveying. The paper reviews the principles and limitations of underwater imaging and describes two new instrument developments; Spotrange and Spotscan, utilizing the new laser technology for detailed ROV based inspection and surveying. A number of actual field applications are given, including structural inspection, detailed seabed surveying, dimensional control measurements and pipeline free-span measurements.
Tipo: Text Palavras-chave: Surveying underwater; Underwater equipment; Lasers; Marine technology; Unmanned vehicles.
Ano: 1990 URL: http://archimer.ifremer.fr/doc/1990/acte-1137.pdf
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Les Nouvelles Technologies et l'Aménagement des Pêches OceanDocs
Ndiaye, Diène.
L'accroissement de la population mondialel et l'application de politiques économiques longtemps régies par l'obsession de maximiser les profits à court terme engendrent une pression sur les ressources naturelles qui ne cesse d'augmenter. Une des conséquences les plus dramatiques de cette exploitation des richesses mondiales est la disparition chaque année de milliers d'espèces végétales et animales (Code de Conduite, FAO).
Tipo: Theses and Dissertations Palavras-chave: Marine technology; Fishery management; Fishery management; Http://aims.fao.org/aos/agrovoc/c_24026.
Ano: 2005 URL: http://hdl.handle.net/1834/2612
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Manipulator requirements for NDT (ROV characteristics and the NDT tooling). ArchiMer
Duncan, N.
Pressures of economics are driving the ROV industry to develop NDT equipment which will allow the ROV to detect, and assess, the presence of fatigue induced surface breaking defects in nodal welds and their associated heat affected zones. Two main techniques of NDT are currently being developed by Comex to provide ROV services to meet client needs. One is an MPI system and the other an Eddy Current system. Both are derivatives of equipment currently being used successfully by divers in the North Sea. The two systems are complementary to each other rather than in competition and offer a high degree of defect evaluation. This paper will discuss the requirements placed on the tool deployment system by the task, the worksite, the ROV characteristics and the...
Tipo: Text Palavras-chave: Nondestructive testing; Manipulators; Marine technology; Unmanned vehicles.
Ano: 1990 URL: http://archimer.ifremer.fr/doc/1990/acte-1160.pdf
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Marine cage fish farming ArchiMer
Espeut, P.; Harache, Yves; Lemarie, Gilles; Ricard, Jean-marc.
Marine capture fisheries in Jamaica is primarily artisanal in nature ansd is conducted maiinly by fishermen operating from canoes. Approximately 95% of these fishermen operate on the coastal shelf and its associated banks. The commercial species harvested comprise bottom-dwelling, coral reef species and free swimming species of finfish. Other fishery resources of commercial value include marine shrimp, conch and lobsters. Catch statistics are not available for all species, but the Department of Fisheries reports a slight decline in fishery production with production decreasing from 16 milion lbs in 1990, despite the fact that fishing efforts have doubled. Over this period the number of registered fishermen has grown from 12 000 to 16 000, al of whom are...
Tipo: Text Palavras-chave: Aquaculture equipment; Cage culture; Rearing; Marine technology; Fish culture; Jamaica.
Ano: 1993 URL: http://archimer.ifremer.fr/doc/1993/rapport-1918.pdf
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Mesures geotechniques par grand fond ArchiMer
Cochonat, Pierre; Dansy, G; Leduc, Bernard; Meunier, Jacques; Harmegnies, Francois; Floury, L.
The mechanical behaviour of sediments is usually studied from laboratory core analyses which do not take into account the real state of in-situ stresses. Therefore, the aimed purpose is presently to determine the in-situ geotechnical properties which mainly depend on the relationship between fine-grained particles and intergranular fluids. At IFREMER, these achievements have been pursued in the framework of 2 scientific program: "Nodules and Sedimentary Processes and Instability on Slopes, for which surficial measurements were conducted on selected seafloor targets usually pre-defined from high resolution geophysical data." 2 kinds of instrumentation were developed in correlation to 2 different strategies of handling at sea. There is the instrumentation of...
Tipo: Text Palavras-chave: Submarine cables; Deep sea mining; Offshore equipment; Geotechnology; Submersibles; Sedimentary structures; Sedimentology; Ferromanganese nodules; Instability; Marine technology; Sediments; Ocean floor; Deep water.
Ano: 1990 URL: http://archimer.ifremer.fr/doc/1990/acte-1157.pdf
Registros recuperados: 31
Primeira ... 12 ... Última
 

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