TERMIUM Plus^®

Fiche 1,  Justifications,  Anglais

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In conventional vibration testing of space hardware, the acceleration input to the base of a test article is controlled to specifications that are typically derived from the article interface acceleration at higher level of assembly. This conventional approach to testing has been known for over 30 years to greatly overtest the test article at its own natural frequencies. In recent years, NASA's Jet Propulsion Laboratory led the development and implementation of an improved method called force limited vibration(FLV) testing. In addition to controlling the input acceleration, the FLV testing measures and limits the reaction forces between the test article and the shaker.  1, fiche 1, Anglais, - force%20limited%20vibration%20testing

Fiche 1,  Justifications,  Français

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Lors de tests vibratoires conventionnels de matériel spatial, l'accélération imposée à la base de l'unité mise à l'essai est contrôlée selon des spécifications habituellement tirées de l'accélération d'interface de l'unité à des niveaux avancés d'assemblage. Depuis maintenant 30 ans, cette approche conventionnelle de mise à l'essai du matériel est reconnue pour surtester les éléments à leurs propres fréquences naturelles. Au cours des dernières années, le JPL [Jet Propulsion Laboratory] de la NASA a été le chef de file dans le développement et la mise en œuvre d'une nouvelle méthode de test vibratoire où la force d'interface est aussi contrôlée (FLV pour Force Limited Vibration testing). En plus de contrôler l'accélération imposée, la méthode d'essai FLV mesure les forces exercées entre l'élément testé et le pot vibrant et limite ces dernières.  1, fiche 1, Français, - m%C3%A9thode%20d%27essai%20FLV

Fiche 1,  Justifications,  Espagnol

Fiche 2,  Justifications,  Anglais

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A tool used by the rockclimbers to pound in pitons, pulling out pitons, testing old fixed pitons, placing copperheads, or placing bolts. It must have a handle which is both strong and able to damp the vibration from a blow.  2, fiche 2, Anglais, - hammer

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Swinging a hammer while you are climbing up a rock can be exhausting. The hammer will start to feel much heavier than it did on the ground. Consequently, you should buy a hammer that is light enough to easily swing, even after you have pounded in a hundred pitons. Yet the hammer cannot be too light: it needs weight to give it enough force. Light-weight climbers find a good hammer head weight is 17-20 ounces. The handle should add no more than 8 ounces. Bigger climbers may want a more substantial hammer: 24-26 ounce hammer head will be heavy enough.  3, fiche 2, Anglais, - hammer

Fiche 2,  Justifications,  Français

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En montagne, le marteau est utilisé essentiellement pour planter les pitons, mais il doit posséder certaines caractéristiques particulières : il doit être très robuste, car sa rupture en pleine paroi peut avoir des conséquences tragiques, immobilisant définitivement une cordée. C'est pourquoi on utilise de plus en plus de marteaux à manche métallique. Celui-ci est percé d'un trou à l'extrémité : une corde y coulisse pour attacher le marteau au poignet de celui qui pitonne afin d'éliminer tout risque de perte.  1, fiche 2, Français, - marteau

Fiche 2,  Justifications,  Espagnol

Fiche 3,  Justifications,  Anglais

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In certain applications, it is not desirable or feasible to mount a machine directly on vibration isolators. Instead, the machine is attached to a relatively heavy and rigid block(usually made of concrete), which is then supported by suitable isolators. The use of such a massive block(called an inertia block or reaction mass) is desirable for the following reasons : 1. If a machine(such as a diesel engine, forging hammer, or vibration testing machine) generates relatively large forces during its operation, the overall movements of the machine on its isolation system tends to become excessive unless its effective mass is subtantially increased. Rigidly attaching the machine to an inertia block and mounting the inertia block on isolators can achieve this increase in effective mass.  1, fiche 3, Anglais, - inertia%20block

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Fiche 3,  Justifications,  Espagnol

Fiche 4,  Justifications,  Anglais

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Viscous boost dampers had to be developed for the solar panels as well as for the magnetometer boom to prevent the two systems from banging together during the launch. The objectives of this development program were to verify that the damping force would meet the requirements for the spacecraft over the operational range of vibration frequencies, and to develop assembly techniques for the magnetometer boom damper. During the development program, both dampers were subjected to small-and large-amplitude vibration testing at many frequencies. These tests were successful and showed that the dampers would safeguard the solar panels and the magnetometer boom.  2, fiche 4, Anglais, - boom%20damper

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Fiche 4,  Justifications,  Espagnol

Fiche 5,  Justifications,  Anglais

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The spacecraft vibration test facility is used to qualify and accept spacecraft and spacecraft components by simulating the various loading environments imposed on hardware and demonstrating compliance to design specifications. Using the facility's electrodynamic shakers, quasi-static, vibrational, and shock loads can be generated and test article characteristics can be quantified via sine sweep testing.  2, fiche 5, Anglais, - vibration%20test%20facility

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Fiche 6,  Justifications,  Anglais

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The present work aims at trying out Acoustic Impact Technique as a possible means of deployment at field level for the purpose of flaw detection in composite helicopter blades. The principle underlying Acoustic Impact Testing is simple. The sound produced when a structure is tapped is mainly at the frequencies of major structural modes of vibration, which are structural properties. Any difference in the sound is necessarily due to modification affected to the force input by the defect in the structure. A study of the force time history of response or its fast fourier transform makes it possible to locate and detect sub surface flaws.  3, fiche 6, Anglais, - acoustic%20impact%20technique

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Type of non-destructive material testing.  4, fiche 6, Anglais, - acoustic%20impact%20technique

Fiche 6,  Justifications,  Français

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Essai non destructif de matériel astronautique.  2, fiche 6, Français, - technique%20du%20choc%20acoustique

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Fiche 7,  Justifications,  Anglais

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Water artificially applied in the form of rain, usually by a rainfall simulator for experimental purposes.  3, fiche 7, Anglais, - artificial%20rainfall

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In BRI's laboratory for building foundation and soils, full-scale testing for soil dynamics is performed. A large-scale, shear soil layer box(5 m x 4 m x 10 m) is equipped in five large pits 6 m below ground to reproduce vibration of the ground during an earthquake. A test for rainfall is conducted in this laboratory using an artificial rainfall apparatus with an intensity up to 150 mm/h that addresses soil pressure during rainfall. In the wind and rain test laboratory, experiments are conducted on the effects of wind on buildings, the waterproof performance of finishes, and the air-flow characteristics in and around buildings.  4, fiche 7, Anglais, - artificial%20rainfall

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They exposed different Sphagnum species to artificial rain (pH 4.2) containing different concentrations of bisulphite or sulphate, within the limits of very high values encountered in some samples of rain.  2, fiche 7, Anglais, - artificial%20rainfall

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rainfall simulator: A device to simulate rainfall, primarily for use in determining infiltration on small areas. Some instruments permit application of droplets of controlled size, simulating natural rainfall; others use sprays. Sometimes called rain maker.  3, fiche 7, Anglais, - artificial%20rainfall

Fiche 7,  Justifications,  Français

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On vérifie l'étanchéité à l'eau des fenêtres et portes-fenêtres en soumettant l'échantillon à une pluie artificielle projetée à différentes forces sur la surface extérieure du produit.  2, fiche 7, Français, - pluie%20artificielle

Fiche 7,  Justifications,  Espagnol

Fiche 8,  Justifications,  Anglais

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Dynamic Testing of Prestressed Concrete Bridges and Numerical Verification.  3, fiche 8, Anglais, - ultrasonic%20testing

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... pile integrity testing, sonic coring, static load testing, simbat dynamic testing, structural monitoring laboratory testing of concrete, soils and aggregates for physical properties, chlorides, strength, contamination, ASR etc.... sales and rental of pile testing equipment, vibration and sound level monitors and many other laboratory and site testing equipment.  4, fiche 8, Anglais, - ultrasonic%20testing

Fiche 8,  Justifications,  Français

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Auscultation dynamique. La méthode qui consiste à mesurer la vitesse de propagation des impulsions ultrasoniques est actuellement la seule du genre qui permette d'effectuer des essais de résistance sur le béton coulé sur place. Cette méthode permet de mesurer le temps de propagation d'une impulsion ultrasonique traversant le béton.  2, fiche 8, Français, - auscultation%20dynamique

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Fiche 10,  Justifications,  Anglais

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All the elastic components of GERB spring elements are made from helical springs with one or more spiral... The load-bearing capacity of the standard GERB steel spring elements goes up to 3200 kg for each element. The frequency in the direction of vertical vibration is about 1. 8-6 Hz. The GERB elements insulate machinery, and function as shock absorbers in all directions without blocking the six degrees of freedom... GERB steel spring elements are suitable for the support of :-Power station machinery(turbo-generators, blowers, coal pulverisers, boiler pumps, diesel engines) and pipelines;-Forge hammers, presses, machine tools, crushers, compressors and testing stands;-Precision machinery of every type such as laser equipment, testing machines, roll grinders, microscopes;-Buildings or parts of buildings. They are also used as oscillation dampers in the construction of bridges.  3, fiche 10, Anglais, - spring%20box

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ChonAn Station has special devices, named spring box, for reducing the vibration of top slab’s train passing (350 km/h).  1, fiche 10, Anglais, - spring%20box

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Spring element for building isolation.  4, fiche 10, Anglais, - spring%20box

Fiche 10,  Justifications,  Français

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Dispositif d'amortissement des ondes sismiques constitué de ressorts protégés par du plastique, solidaires de plaques de caoutchouc.  3, fiche 10, Français, - bo%C3%AEte%20%C3%A0%20ressorts

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Les éléments de suspension des boîtes à ressort GERB sont constitués d'un ou de plusieurs ressorts hélicoïdaux. [...] En exécution standard, les boîtes à ressort GERB sont disponibles pour des charges maximales de 3200 kg par unité. Leur fréquence propre d'oscillation verticale est comprise en 1,8 et 6 Hz. Les éléments GERB permettent une isolation vibratoire de machines avec effet amortissant sur trois axes, sans blocage des six degrés de liberté de la masse monobloc oscillante. [...] Les boîtes à ressort GERB permettent de réaliser les appuis élastiques de : - machines de centrales de force motrice, souffleries, broyeurs à charbon, pompes de chaudière, moteurs diesel ainsi que les suspensions pour tuyauterie; - forges, presses, machines-outils, concasseurs, compresseurs et bancs d'essai; - machines de précision en tout genre (par ex. installations à laser, machines de test, machines à rectifier les cylindres, microscopes); - bâtiments ou éléments de bâtiments et ponts.  2, fiche 10, Français, - bo%C3%AEte%20%C3%A0%20ressorts

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Le chantier se situant au droit d'une ligne de métro, l'utilisation d'un système anti-vibrations fut nécessaire. Deux techniques furent employées : - des appuis Néoprène. - des boîtes à ressorts.  4, fiche 10, Français, - bo%C3%AEte%20%C3%A0%20ressorts

Fiche 10,  Justifications,  Espagnol

Fiche 11,  Justifications,  Anglais

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Another new class of testing tool allows engineers to observe patterns of stress and strain on a spinning disc. Pulsed-laser holography, one of these new methods, uses rapid sequences of holographic "snapshots" to create holograms which can show minute surface distortions caused by vibration. An optical "derotator", consisting of a prism rotating at half the speed of the specimen, freezes the movement of the disc so that the image can be processed.  2, fiche 11, Anglais, - derotator

Fiche 11,  Justifications,  Français

Record number: 11, Textual support number: 1 DEF

Appareil qui comporte un dispositif optique (un prisme) doté d'un système anti-vibratoire, monté sur un moteur synchronisé à la moitié de la vitesse de rotation de l'objet observé permettant ainsi d'en figer le mouvement pendant la rotation.  2, fiche 11, Français, - d%C3%A9rotateur

Fiche 11,  Justifications,  Espagnol