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AIR CALIBRATION [5 records]

Record 1 2012-02-22

English

Subject field(s)
  • Atmospheric Physics
  • Air Pollution
DEF

Air (relatively) devoid of solid, liquid or gaseous pollutant materials.

CONT

The composition of air is variable with respect to several of its components(e. g., CH4, CO2, H2O) so "pure" air has no precise meaning; it is commonly considered to be air which is free of dust, [hydrometeors, ] aerosols, and reactive gaseous contaminants of anthropogenic origin [such as industrial effluents].... Relative clean air which is free of most reactive anthropogenic pollution(NO, NO2, SO2, non-methane hydrocarbons, etc.), often used as a reference sample in the calibration and operation of instruments, is purchased under the designation of zero air.

CONT

[The] so-called "pure" air is a mixture of gases containing about 78 percent nitrogen; 21 percent oxygen; less than 1 percent of carbon dioxide, argon, and other inert gases; and varying amounts of water vapor.

OBS

air: The mixture of gases comprising the earth’s atmosphere.

French

Domaine(s)
  • Physique de l'atmosphère
  • Pollution de l'air
DEF

Air (relativement) exempt de matières polluantes solides, liquides ou gazeuses.

CONT

L'air est un mélange de gaz constituant l'atmosphère qui entoure la terre. L'air pur est composé de 21 % d'oxygène et de 78 % d'azote par volume, en plus de quantités infimes d'autres gaz comme l'argon, le gaz carbonique et la vapeur d'eau.

Spanish

Campo(s) temático(s)
  • Física de la atmósfera
  • Contaminación del aire
DEF

Aire (relativamente) exento de materiales contaminantes sólidos, líquidos o gaseosos.

Save record 1

Record 2 2012-01-26

English

Subject field(s)
  • Railroad Maintenance
  • Braking Devices (Mechanical Components)
DEF

Train brake leakage test method that uses the brake pipe flow indicator/meter.

CONT

The Air Flow Method utilizes air flow into the brake pipe as shown on the Brake Pipe Flow Indicator along with a specified pressure at the rear of the train to qualify trains with respect to testing of Air Brakes.... The Air Flow Method will only be performed on freight trains with leading engines equipped with a pressure-maintaining feature and a Brake Pipe Flow Indicator which has been marked with an orange calibration line.

French

Domaine(s)
  • Entretien (Équipement ferroviaire)
  • Freins (Composants mécaniques)
DEF

Méthode d'essai d'étanchéité de frein de train qui emploie l'indicateur de débit de conduite générale.

Spanish

Save record 2

Record 3 2003-08-18

English

Subject field(s)
  • Research Experiments in Space
CONT

The Rocket Assembly/Checkout Facility... The facility consists of six contiguous laboratory modules subdivided into a storage area, a gray room area, and a clean room. The storage area houses spare instrument components and intermittently used ground support equipment. The gray room area contains facilities to clean components before they enter the clean room and equipment used to ship the instrument to WSMR [White Sands Mission Range]. The Class 100 cross-flow clean room is separated from the gray room by an air shower. The clean room contains three major stations : a clean bench for assembly of subsystems; a 12x14-ft optical bench for instrument assembly and electronic test of the instrument subsystems; and a vacuum chamber for vacuum focus and spectroradiometric calibration. The cryogenically pumped vacuum chamber is designed with a 30-cm diameter ultraviolet collimator at one end and a roll-off section that accommodates the entire flight instrument centered in the collimated beam at the other end.

French

Domaine(s)
  • Travaux de recherche dans l'espace

Spanish

Save record 3

Record 4 2001-09-21

English

Subject field(s)
  • Aircraft Piloting and Navigation
  • Launching and Space Maneuvering
  • Ship Piloting
CONT

This thesis presents a new approach for the initialization process(initial alignment and calibration) of strapdown Inertial Navigation Systems for air launched tactical missiles operating in an unaided inertial navigation mode... The initialization is treated as a training of Artificial Neural Network filter. A new methodology is developed which can handle, misalignment of Inertial Navigation System and scale factor, as well as bias errors of the measurement instruments used in Inertial Navigation System... It is shown that the optimization algorithm employed as well as Artificial Neural Network is quite suitable for Inertial Navigation System initialization. Prelaunch aircraft maneuvers measured by the Inertial Navigation System of the aircraft provide the necessary training data for the Neural Network for the missile navigation system that initializes the missile's inertial navigation system.

Key term(s)
  • initialization of an inertial navigation system
  • initializing of an inertial navigation system
  • INS initializing

French

Domaine(s)
  • Pilotage et navigation aérienne
  • Lancement et manœuvres dans l'espace
  • Pilotage des navires
CONT

Alignement et initialisation de la centrale : la deuxième opération consiste à aligner la plate-forme sur les directions stellaires, ou encore aligner les axes plate-forme Xp, Yp, Zp sur les axes absolus. [...] À l'instant initial, cette opération porte le nom d'initialisation de la centrale, et à un instant quelconque on l'appellera asservissement de la plate-forme. Tout repose sur une rotation d'erreur détectée par des «pick off» (détecteurs d'écarts angulaires) placés sur les articulations des axes 1-2-3-4.

OBS

Un des gros inconvénients des centrales inertielles était la nécessité de les recaler (tout comme le conservateur de cap). De nos jours cet inconvénient a totalement disparu dans la mesure où l'initialisation est réalisée automatiquement à partir d'informations issues d'au moins trois satellites ... Américains.

Spanish

Save record 4

Record 5 2001-09-11

English

Subject field(s)
  • Flight Instruments and Equipment (Aeroindustry)
  • Aircraft Piloting and Navigation
  • Navigation Instruments
OBS

[The] thesis presents a new approach for the initialization process(initial alignment and calibration) of strapdown inertial navigation systems for air launched tactical missiles operating in an unaided inertial navigation mode... Prelaunch aircraft maneuvers measured by the inertial navigation system of the aircraft provide the necessary training data for the Neural Network for the missile navigation system that initializes the missile's inertial navigation system.

French

Domaine(s)
  • Instruments et équipement de bord (Constructions aéronautiques)
  • Pilotage et navigation aérienne
  • Instruments de navigation
OBS

Alignement et initialisation de la centrale [inertielle] : la deuxième opération consiste à aligner la plate-forme sur les directions stellaires, ou encore aligner les axes plate-forme Xp, Yp, Zp sur les axes absolus.

Spanish

Save record 5

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