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VELOCITY APPROACH [7 fiches]

Fiche 1 2003-12-08

Anglais

Subject field(s)
  • Launching and Space Maneuvering
CONT

R bar approach of the space shuttle towards the satellite ... along the radius vector.

OBS

For visualization purposes, the station's direction of motion is called the velocity vector, or V-bar for short. By convention, points in front of the station are said to be on the positive V-bar while points behind are considered negative. The imaginary line connecting the station with the center of the Earth is called the radius vector, or R-bar. Points directly below the station along this line are considered positive while points above are considered negative. Endeavour, then, will approach the station along the plus R-bar. The station will be oriented with its long axis aligned with the velocity vector, with the Unity module in "front" and Zvezda behind. Unity's nadir and zenith ports will be oriented as their names imply. This orientation, or attitude, is known as "XVV, "i. e., the station's X axis is aligned with the velocity vector. The terminal rendezvous sequence will begin with a rocket firing(TI) as Endeavour trails the station by about eight nautical miles. Once the shuttle reaches the plus R-bar, commander Brent Jett will guide the ship up from directly below. As he nears the station, he will yaw the shuttle 180 degrees so its tail is pointing in the direction of motion and its nose toward the minus V-bar. Assuming a good linkup, the shuttle will begin controlling the station's orientation for the duration of Endeavour's mission, moving the lab back into an "X-POP" attitude with the station's X axis perpendicular to the plane of its orbit. In this orientation, the long axis of the station is broadside to the velocity vector.

OBS

R-bar approach: term officially approved by the International Space Station official approval Group (ISSOAG).

PHR

Minus R-bar approach.

Français

Domaine(s)
  • Lancement et manœuvres dans l'espace
OBS

[L'] alignement du port d'amarrage de Mir avec celui situé dans la soute de la navette [...] doit être positionné sur une ligne imaginaire baptisée «R-bar», allant de Mir au centre de la Terre. Il s'agit de mettre à profit la mécanique céleste, qui veut que plus l'orbite est basse, plus la vitesse de rotation autour de la Terre est rapide. En s'approchant «par en-dessous» de la station, l'avion spatial bénéficie d'un freinage naturel.

OBS

approche en R-bar : terme uniformisé par le Groupe de travail de la terminologie de la Station spatiale internationale (GTTSSI).

Espagnol

Conserver la fiche 1

Fiche 2 2003-10-31

Anglais

Subject field(s)
  • Atmospheric Physics
DEF

Strong wind, producing a duststorm or sandstorm, in central and northern Sudan.

CONT

The name comes from the Arabic word habb, meaning wind. Haboobs are most frequent from May through September, especially in June, but they have occurred in every month except November. Their average duration is three hours; they are most severe in April and May when the soil is driest. They may approach from any direction, but most commonly from the north in winter and from the south, southeast, or east in summer. The average maximum wind velocity is over 13 m s1(30 mph) and a speed of 28 m s1(62 mph) has been recorded. The sand and dust form a dense whirling wall that may be 1000 m(3000 ft) high; it is often preceded by isolated dust whirls. During these storms, enormous quantities of sand are deposited. Haboobs usually occur after a few days of rising temperature and falling pressure.

Français

Domaine(s)
  • Physique de l'atmosphère
DEF

Vent fort, produisant une tempête de poussière ou de sable, dans le centre et le nord du Soudan.

Espagnol

Campo(s) temático(s)
  • Física de la atmósfera
DEF

En la parte central y septentrional del Sudán, el fuerte viento que acompaña a las tormentas de polvo o arena.

Conserver la fiche 2

Fiche 3 2002-05-13

Anglais

Subject field(s)
  • Launching and Space Maneuvering
CONT

The imaginary line connecting the station with the center of the Earth is called the radius vector, or R-bar. Points directly below the station along this line are considered positive while points above are considered negative.

CONT

For visualization purposes, the station's direction of motion is called the velocity vector, or V-bar for short. By convention, points in front of the station are said to be on the positive V-bar while points behind are considered negative. The imaginary line connecting the station with the center of the Earth is called the radius vector, or R-bar. Points directly below the station along this line are considered positive while points above are considered negative. Endeavour, then, will approach the station along the plus R-bar. The station will be oriented with its long axis aligned with the velocity vector, with the Unity module in "front" and Zvezda behind. Unity's nadir and zenith ports will be oriented as their names imply. This orientation, or attitude, is known as "XVV, "i. e., the station's X axis is aligned with the velocity vector. The terminal rendezvous sequence will begin with a rocket firing(TI) as Endeavour trails the station by about eight nautical miles. Once the shuttle reaches the plus R-bar, commander Brent Jett will guide the ship up from directly below. As he nears the station, he will yaw the shuttle 180 degrees so its tail is pointing in the direction of motion and its nose toward the minus V-bar. Assuming a good linkup, the shuttle will begin controlling the station's orientation for the duration of Endeavour's mission, moving the lab back into an "X-POP" attitude with the station's X axis perpendicular to the plane of its orbit. In this orientation, the long axis of the station is broadside to the velocity vector.

OBS

R-bar: term officially approved by the International Space Station official approval Group (ISSOAG).

PHR

Docking in R-bar axis.

PHR

R-bar approach.

Français

Domaine(s)
  • Lancement et manœuvres dans l'espace
CONT

Atlantis s'est retrouvée alors sur l'Axe-R, cette ligne imaginaire reliant Mir au centre de la Terre.

OBS

axe-R : terme uniformisé par le Groupe de travail de la terminologie de la Station spatiale internationale (GTTSSI).

Espagnol

Conserver la fiche 3

Fiche 4 2002-05-13

Anglais

Subject field(s)
  • Launching and Space Maneuvering
CONT

Positioned directly in front of the station's long axis, Bloomfield will manually guide Atlantis in so the docking system in the shuttle's cargo bay can mate with its counterpart on the pressurized mating adapter, or PMA. "We call it a V-bar approach, "Bloomfield said, referring to the station's velocity vector. "We’ll fly below the international space station and then we’ll fly all the way around out into the front, into what we call the V-bar, but we’re flying now out in front of the station. And then finally, we’ll fly in on that V-bar until we dock. "

OBS

... the station’s direction of motion is called the velocity vector, or V-bar for short. By convention, points in front of the station are said to be on the positive V-bar while points behind are considered negative.

OBS

V-bar approach: term officially approved by the International Space Station official approval Group (ISSOAG).

PHR

Positive V-bar; negative V-bar.

Terme(s)-clé(s)
  • V bar approach

Français

Domaine(s)
  • Lancement et manœuvres dans l'espace
OBS

approche en V-bar : terme uniformisé par le Groupe de travail de la terminologie de la Station spatiale internationale (GTTSSI).

Espagnol

Conserver la fiche 4

Fiche 5 1999-09-24

Anglais

Subject field(s)
  • Fluid Mechanics and Hydraulics (Physics)
DEF

Resistance caused by friction in the direction opposite to that of the motion of the center of gravity of a moving body in a fluid.

CONT

An object submerged in a flowing liquid is subjected to a fluid force component on it in the direction of the approach velocity called the drag.

Français

Domaine(s)
  • Mécanique des fluides et hydraulique (Physique)
DEF

Force qui s'oppose au mouvement d'un corps dans un fluide.

Espagnol

Campo(s) temático(s)
  • Mecánica de fluidos e hidráulica (Física)
DEF

Fuerza ejercida por una corriente o fluido, por ejemplo, agua, y proyectada en la dirección del flujo sobre un objeto situado en o adyacente al fluido.

Conserver la fiche 5

Fiche 6 1996-11-25

Anglais

Subject field(s)
  • Hydrology and Hydrography
  • Scientific Measurements and Analyses
DEF

The mean velocity in an open channel at a known distance upstream of a measuring section [standardized by ISO].

OBS

approach velocity; velocity of approach : standardized by ISO.

Français

Domaine(s)
  • Hydrologie et hydrographie
  • Mesures et analyse (Sciences)
DEF

Vitesse moyenne dans un chenal à une distance connue en amont d'un dispositif de mesurage [normalisée par l'ISO].

OBS

vitesse d'approche : normalisé par l'ISO.

Espagnol

Campo(s) temático(s)
  • Hidrología e hidrografía
  • Medición y análisis (Ciencias)
DEF

Velocidad media en un conducto o cauce a poca distancia aguas arriba de un vertedero u otra obra, especialmente con fines de medida.

Conserver la fiche 6

Fiche 7 1986-06-12

Anglais

Subject field(s)
  • Calorimetry
  • Geothermal Power Plants
CONT

... in expanding from 193 ° C to 148 ° C the isentropic heat drop is 2. 683 cal/g and the theoretical jet velocity would approach 150m/sec.

Français

Domaine(s)
  • Calorimétrie
  • Centrales géothermiques

Espagnol

Conserver la fiche 7

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