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GYROS BODY [3 records]

Record 1 2011-07-18

English

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

Mechanical gyros(Dynamically Tuned Gyro, DTG) consist of a rotating body suspended dynamically tuned on low friction gimbals. The rotating mass attempts to keep the orientation of the rotation axis constant and thus creates a torque on the suspension when the system is turned. The torque is proportional to the rate.

French

Domaine(s)
  • Mécanique générale (Physique)
  • Pilotage et navigation aérienne
  • Instruments de navigation
  • Instruments et équipement de bord (Constructions aéronautiques)
CONT

Équations de la gyroscopie [...] Suspension dynamique accordée [...] le principe : Les paliers des articulations S1-S2 et S2-S3 ne sont plus des roulements, mais remplacés par [des] joints de Hooke ou encore des barres de torsion élastiques. Un calcul complexe montre qu'à une vitesse précise dite d'accord, la raideur des joints est compensée [...] par le couple des forces d'inertie centrifuge et la suspension ne présente plus alors aucune rigidité. Les débattements de la toupie, en orientation, sont limités à quelques degrés. La condition d'accord définissant la vitesse correcte relie les caractéristiques des barres de torsion et un moment d'inertie particulier de l'anneau interne. On l'appelle la condition de tuning et c'est ce qui donne à la technique le nom de gyroscope accordé.

Spanish

Save record 1

Record 2 2001-08-24

English

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

Another reason to believe the spacecraft experienced high body rates is that the gyros-all three axes independently-were found in Whole Angle Mode(WAM) when the spacecraft was recovered. This mode is entered when the gyro's normal strap-down mode(a locked force-to-rebalance loop) cannot be maintained; this occurs when body rates exceed about 11°/s...

OBS

whole angle mode: A mode of single-axis operation in which the pickoff output is a measure of the net angle of rotation since initialization.

French

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

Le gyroscope est un appareil capable de fournir une direction physique de référence et, corrélativement, une information de rotation angulaire, sous forme d'un écart angulaire, ou d'un angle total [...] compris entre 0 et 360°, vis-à-vis d'un référentiel absolu ou «inertiel».

Spanish

Save record 2

Record 3 2001-08-21

English

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

A mode of single-axis operation in which the pickoff output is a measure of the net angle of rotation since initialization.

CONT

Another reason to believe the spacecraft experienced high body rates is that the gyros-all three axes independently-were found in Whole Angle Mode(WAM) when the spacecraft was recovered. This mode is entered when the gyro's normal strap-down mode(a locked force-to-rebalance loop) cannot be maintained; this occurs when body rates exceed about 11°/s...

French

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

Le gyroscope est un appareil capable de fournir une direction physique de référence et, corrélativement, une information de rotation angulaire, sous forme d'un écart angulaire, ou d'un angle total [...] compris entre 0 et 360°, vis-à-vis d'un référentiel absolu ou «inertiel».

Spanish

Save record 3

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