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GYROSCOPIC PRECESSION [28 records]
Record 1 - internal organization data 2015-10-23
Record 1, English
Record 1, Subject field(s)
- General Mechanics (Physics)
- Flight Instruments and Equipment (Aeroindustry)
- Launching and Space Maneuvering
- Helicopters (Military)
Record 1, Main entry term, English
- precessional motion
1, record 1, English, precessional%20motion
correct
Record 1, Abbreviations, English
Record 1, Synonyms, English
- precession 2, record 1, English, precession
correct
- precessional movement 3, record 1, English, precessional%20movement
correct
- gyroscopic precession 4, record 1, English, gyroscopic%20precession
correct
- precession of the gyroscope 5, record 1, English, precession%20of%20the%20gyroscope
correct
- gyro precession 6, record 1, English, gyro%20precession
correct
Record 1, Textual support, English
Record number: 1, Textual support number: 1 DEF
The tendency of a rotating body, when a force is applied perpendicular to its plane of rotation, to turn in the direction of its rotation 90 degrees to its axis and take up a new plane of rotation parallel to the applied force. 7, record 1, English, - precessional%20motion
Record number: 1, Textual support number: 1 CONT
Gyroscopic precession... When force is applied to a gyro, the device reacts as if the force had been applied at a point 90 degrees from the point of actual application, in the direction of rotation. Precession affects propellers, which act like gyros, and gyro instruments. Its principle effect is on the heading indicator, which tends to drift over time. 8, record 1, English, - precessional%20motion
Record number: 1, Textual support number: 2 CONT
A gyroscope will not only resist being moved out of its vertical position, it will also generate force as it attempts to travel in large, circular patterns. These patterns are most easily seen with a spinning top. As the top begins losing its energy, it never simply spirals straight down in the same direction that it was originally spinning. As it destabilizes, it will always begin slowly rotating or precessing in a slow, even circle that is in the opposite direction to its normal spinning motion. These circular patterns are known as "precessional" motions, and they are another aspect of a gyroscope’s movement that will occur either in air or in a vacuum and can be used to overcome gravity. 9, record 1, English, - precessional%20motion
Record number: 1, Textual support number: 3 CONT
If an airplane changes suddenly from a nose up to a nose down position, as is the case during the take-off roll in a tail wheel airplane, the airplane will yaw sharply to the left as the pilot shoves the wheel forward to raise the tail. The application of right rudder compensates for the precession tendency. 7, record 1, English, - precessional%20motion
Record 1, French
Record 1, Domaine(s)
- Mécanique générale (Physique)
- Instruments et équipement de bord (Constructions aéronautiques)
- Lancement et manœuvres dans l'espace
- Hélicoptères (Militaire)
Record 1, Main entry term, French
- précession
1, record 1, French, pr%C3%A9cession
correct, feminine noun
Record 1, Abbreviations, French
Record 1, Synonyms, French
- mouvement de précession 2, record 1, French, mouvement%20de%20pr%C3%A9cession
correct, masculine noun
- précession gyroscopique 3, record 1, French, pr%C3%A9cession%20gyroscopique
correct, feminine noun
- précession du gyroscope 4, record 1, French, pr%C3%A9cession%20du%20gyroscope
correct, feminine noun
Record 1, Textual support, French
Record number: 1, Textual support number: 1 DEF
Tendance qu'a un corps en rotation, sur lequel on applique une force perpendiculairement à son axe de rotation, de tourner 90 degrés par rapport à son axe de rotation, dans le même sens que la rotation, pour finir sur un nouveau plan de rotation parallèle à la force appliquée. 5, record 1, French, - pr%C3%A9cession
Record number: 1, Textual support number: 1 CONT
Si l'on applique un couple à un gyroscope en rotation, couple appliqué sur un axe différent de son axe de rotation, il réagit à ce couple de manière à amener son axe de rotation parallèle à celui du couple appliqué, et ceci par le plus court chemin. Ce mouvement est dit «mouvement de précession» lorsqu'il est provoqué volontairement, et «dérive» lorsqu'il est dû à un élément perturbateur. 6, record 1, French, - pr%C3%A9cession
Record number: 1, Textual support number: 2 CONT
Mouvement de précession stable d'un gyroscope. 7, record 1, French, - pr%C3%A9cession
Record number: 1, Textual support number: 1 OBS
L'usage fait donner des appellations différentes à cette composante de rotation instantanée [...] : lorsqu'elle est due à un phénomène déterministe et connu, on l'appelle «précession gyroscopique»; lorsqu'elle est due à un phénomène aléatoire, ou bien que l'on ne maîtrise pas, on l'appelle «dérive gyroscopique». 8, record 1, French, - pr%C3%A9cession
Record number: 1, Textual support number: 2 OBS
précession; précession gyroscopique : termes d'usage obligatoire au Bureau de la traduction du Canada. 9, record 1, French, - pr%C3%A9cession
Record number: 1, Textual support number: 1 PHR
Précession astronomique, précession de déplacement, précession instrumentale, précession mécanique. 10, record 1, French, - pr%C3%A9cession
Record 1, Spanish
Record 1, Campo(s) temático(s)
- Mecánica general (Física)
- Instrumentos y equipo de vuelo (Industria aeronáutica)
- Lanzamiento y maniobras en el espacio
- Helicópteros (Militar)
Record 1, Main entry term, Spanish
- precesión
1, record 1, Spanish, precesi%C3%B3n
correct, feminine noun
Record 1, Abbreviations, Spanish
Record 1, Synonyms, Spanish
- precesión giroscópica 2, record 1, Spanish, precesi%C3%B3n%20girosc%C3%B3pica
correct, feminine noun
Record 1, Textual support, Spanish
Record number: 1, Textual support number: 1 DEF
Movimiento cónico de rotación, en torno de una posición media, que toma en el espacio el eje de los cuerpos que giran sobre sí mismos con movimiento giroscópico. 1, record 1, Spanish, - precesi%C3%B3n
Record 2 - internal organization data 2010-07-09
Record 2, English
Record 2, Subject field(s)
- General Mechanics (Physics)
- Aircraft Piloting and Navigation
- Navigation Instruments
- Flight Instruments and Equipment (Aeroindustry)
Record 2, Main entry term, English
- gyroscopic inertia
1, record 2, English, gyroscopic%20inertia
correct
Record 2, Abbreviations, English
Record 2, Synonyms, English
- rigidity in space 2, record 2, English, rigidity%20in%20space
correct
- rigidity 3, record 2, English, rigidity
correct
- gyro's rigidity in space 4, record 2, English, gyro%27s%20rigidity%20in%20space
correct
- gyroscopic rigidity in space 5, record 2, English, gyroscopic%20rigidity%20in%20space
correct
- fixity 3, record 2, English, fixity
correct
- principle of rigidity in space 6, record 2, English, principle%20of%20rigidity%20in%20space
correct
- gyroscopic effect 7, record 2, English, gyroscopic%20effect
correct
Record 2, Textual support, English
Record number: 2, Textual support number: 1 DEF
The tendency of any rotating body, if undisturbed, to maintain its plane of rotation. 5, record 2, English, - gyroscopic%20inertia
Record number: 2, Textual support number: 1 CONT
Rigidity in space. The gyroscope resists turning. When it is "gimbaled" (free to move in a given direction) such that it is free to move either in 1, 2 or 3 dimensions, any surface such as an instrument dial attached to the gyro assembly will remain rigid in space even though the case of the gyro turns. The attitude indicator (AI) and the heading indicator (HI) use this property of rigidity in space for their operation. 6, record 2, English, - gyroscopic%20inertia
Record number: 2, Textual support number: 2 CONT
The turning of the frisbee mostly produces "stability", that is the spinning keeps the frisbee level in flight due to the "gyroscopic" effect, i.e. any spinning disc likes to stay spinning at the same angle. 8, record 2, English, - gyroscopic%20inertia
Record number: 2, Textual support number: 3 CONT
A gyroscope is any rotating body that exhibits two fundamental properties :gyroscopic inertia, or rigidity in space, and precession, the tilting of the axis at right angles to any force tending to alter the plane of rotation. These properties are inherent in all rotating bodies, including the earth itself. 9, record 2, English, - gyroscopic%20inertia
Record number: 2, Textual support number: 1 PHR
To remain rigid in space. 6, record 2, English, - gyroscopic%20inertia
Record 2, French
Record 2, Domaine(s)
- Mécanique générale (Physique)
- Pilotage et navigation aérienne
- Instruments de navigation
- Instruments et équipement de bord (Constructions aéronautiques)
Record 2, Main entry term, French
- inertie gyroscopique
1, record 2, French, inertie%20gyroscopique
correct, feminine noun
Record 2, Abbreviations, French
Record 2, Synonyms, French
- effet gyroscopique 2, record 2, French, effet%20gyroscopique
correct, masculine noun
- principe de la fixité dans l'espace 3, record 2, French, principe%20de%20la%20fixit%C3%A9%20dans%20l%27espace
correct, masculine noun
- fixité 4, record 2, French, fixit%C3%A9
correct, feminine noun
- fixité dans l'espace 5, record 2, French, fixit%C3%A9%20dans%20l%27espace
correct, feminine noun
- immobilité dans l'espace 6, record 2, French, immobilit%C3%A9%20dans%20l%27espace
correct, feminine noun
- loi de fixité 7, record 2, French, loi%20de%20fixit%C3%A9
correct, feminine noun
- inertialité 8, record 2, French, inertialit%C3%A9
correct, feminine noun
- fixité dans l'espace absolu 8, record 2, French, fixit%C3%A9%20dans%20l%27espace%20absolu
correct, feminine noun
- fixité de l'axe propre du gyroscope 9, record 2, French, fixit%C3%A9%20de%20l%27axe%20propre%20du%20gyroscope
feminine noun
- rigidité dans l'espace 3, record 2, French, rigidit%C3%A9%20dans%20l%27espace
see observation, feminine noun
- principe de la rigidité dans l'espace 3, record 2, French, principe%20de%20la%20rigidit%C3%A9%20dans%20l%27espace
see observation, masculine noun
- principe de la rigidité gyroscopique dans l'espace 3, record 2, French, principe%20de%20la%20rigidit%C3%A9%20gyroscopique%20dans%20l%27espace
see observation, masculine noun
- rigidité gyroscopique 10, record 2, French, rigidit%C3%A9%20gyroscopique
see observation, feminine noun
- fixité gyroscopique 11, record 2, French, fixit%C3%A9%20gyroscopique
feminine noun
Record 2, Textual support, French
Record number: 2, Textual support number: 1 DEF
Tendance qu'a un corps en rotation de maintenir son plan de rotation s'il n'est pas dérangé. 3, record 2, French, - inertie%20gyroscopique
Record number: 2, Textual support number: 1 CONT
L'inertie gyroscopique, appelée aussi effet gyroscopique, constitue la propriété fondamentale des gyroscopes. [...] Il s'agit d'un principe selon lequel tous les objets résistent naturellement à l'accélération ou au changement de direction. (Par exemple, les occupants d'une voiture sont projetés vers l'avant quand celle-ci s'arrête brusquement parce qu'en raison de leur inertie, les corps continuent leur mouvement vers l'avant même si la voiture s'est arrêtée.) Lorsqu'on parle d'inertie gyroscopique, on fait allusion à l'inertie que possède un corps qui tourne. Tous les objets tournant autour d'un axe ont tendance à maintenir une orientation fixe, c'est-à-dire une direction de rotation et une position fixes, si aucune force n'intervient. En d'autres mots, un objet qui tourne a tendance à rester dans la même position. 2, record 2, French, - inertie%20gyroscopique
Record number: 2, Textual support number: 2 CONT
Un gyroscope [...] utilise [...] la propriété caractéristique d'inertialité (fixité dans l'espace absolu), totale ou partielle de certains phénomènes physiques. 8, record 2, French, - inertie%20gyroscopique
Record number: 2, Textual support number: 1 OBS
Certains spécialistes contestent l'emploi du terme «rigidité» qui semble être un calque de l'anglais occasionnant un non-sens en français. 11, record 2, French, - inertie%20gyroscopique
Record 2, Key term(s)
- fixité gyroscopique
- propriété de fixité de l'axe propre du gyroscope
Record 2, Spanish
Record 2, Textual support, Spanish
Record 3 - internal organization data 2003-10-22
Record 3, English
Record 3, Subject field(s)
- Flight Instruments and Equipment (Aeroindustry)
- Launching and Space Maneuvering
Record 3, Main entry term, English
- control moment gyroscope
1, record 3, English, control%20moment%20gyroscope
correct, officially approved
Record 3, Abbreviations, English
- CMG 2, record 3, English, CMG
correct, officially approved
Record 3, Synonyms, English
- gyrodyne 3, record 3, English, gyrodyne
correct, officially approved
- control moment gyro 2, record 3, English, control%20moment%20gyro
correct
- CMG 2, record 3, English, CMG
correct
- CMG 2, record 3, English, CMG
Record 3, Textual support, English
Record number: 3, Textual support number: 1 DEF
A torque-generating mechanism that incorporates a single- or double- gimbaled spinning wheel. 4, record 3, English, - control%20moment%20gyroscope
Record number: 3, Textual support number: 1 CONT
The next generation of "agile" observation satellites will probably be controlled by high dynamic torque actuators called gyrodynes. The gyrodyne uses the principle of the gyroscope to exert a force on a satellite, to change its attitude. The gyrodyne consists of a top spinning around a tilt axis. 3, record 3, English, - control%20moment%20gyroscope
Record number: 3, Textual support number: 2 CONT
A CMG(control moment gyro) is an actuator consisting of a spinner with a sustained kinetic moment modulus h and one or two motor-driven tilt axes. One-axis CMGs are used to generate very high dynamic moments. The produced gyroscopic torque is proportional to h and to the precession rate(i. e. tilting rate). 5, record 3, English, - control%20moment%20gyroscope
Record number: 3, Textual support number: 1 OBS
control moment gyroscope; gyrodyne; CMG: terms and abbreviation officially approved by the International Space Station official approval Group (ISSOAG). 6, record 3, English, - control%20moment%20gyroscope
Record 3, Key term(s)
- control moment gyroscope
Record 3, French
Record 3, Domaine(s)
- Instruments et équipement de bord (Constructions aéronautiques)
- Lancement et manœuvres dans l'espace
Record 3, Main entry term, French
- actionneur gyroscopique
1, record 3, French, actionneur%20gyroscopique
correct, masculine noun, officially approved
Record 3, Abbreviations, French
- CMG 2, record 3, French, CMG
correct, masculine noun, officially approved
Record 3, Synonyms, French
- gyrodyne 3, record 3, French, gyrodyne
correct, masculine noun, officially approved
- GCG 4, record 3, French, GCG
masculine noun
- GCG 4, record 3, French, GCG
- générateur de couple gyroscopique 4, record 3, French, g%C3%A9n%C3%A9rateur%20de%20couple%20gyroscopique
correct, masculine noun
Record 3, Textual support, French
Record number: 3, Textual support number: 1 CONT
Les actionneurs gyroscopiques également appelés gyrodynes (CMG : Control Moment Gyro) constituent un nouveau système d'actionneurs qui permettent de générer des couples dynamiques de commande de basculement d'attitude d'un satellite. Ces couples de nature gyroscopique sont produits par une commande des vitesses de précession d'une famille de toupies gyroscopiques montées sur le véhicule. 4, record 3, French, - actionneur%20gyroscopique
Record number: 3, Textual support number: 2 CONT
Les gyrodynes : une technologie prometteuse pour la commande d'attitude des satellites. Également appelé actionneur gyroscopique, le gyrodyne est une commande d'attitude utilisant des actionneurs à fort couple dynamique. 5, record 3, French, - actionneur%20gyroscopique
Record number: 3, Textual support number: 3 CONT
La prochaine génération de satellites d'observation, appelés satellites agiles, sera probablement commandée par des actionneurs à fort couple dynamique : les gyrodynes. Fonctionnant sur le principe des gyroscopes, ils peuvent agir sur les satellites et les orienter dans une attitude donnée. Les gyrodynes sont constitués d'une toupie en rotation rapide entretenue autour d'un axe propre, la commande permettant de faire tourner ce dernier autour d'un axe de précession, ou de basculement [...] 6, record 3, French, - actionneur%20gyroscopique
Record number: 3, Textual support number: 1 OBS
actionneur gyroscopique; gyrodyne; CMG : termes et abréviation uniformisés par le Groupe de travail de la terminologie de la Station spatiale internationale (GTTSSI). 2, record 3, French, - actionneur%20gyroscopique
Record 3, Spanish
Record 3, Textual support, Spanish
Record 4 - internal organization data 2002-07-16
Record 4, English
Record 4, Subject field(s)
- General Mechanics (Physics)
- Aircraft Piloting and Navigation
- Navigation Instruments
- Flight Instruments and Equipment (Aeroindustry)
Record 4, Main entry term, English
- apparent precession error
1, record 4, English, apparent%20precession%20error
correct
Record 4, Abbreviations, English
Record 4, Synonyms, English
Record 4, Textual support, English
Record number: 4, Textual support number: 1 CONT
Precession error. Frictional forces in the gyros system cause it to precess. This precession causes a creep or drift in the reading on the card, amounting approximately 3 degrees in 15 minutes. The gyro is also subject to apparent precession. Gyroscopic inertia keeps the spinning gyro fixed in space so that, relative to space, it does not move. But the earth rotating underneath it gives it an apparent motion relative to the earth. This causes an apparent drift, or precession, which varies with latitude... Precession error, both mechanical and apparent, must be corrected for at regular intervals of about 15 minutes. 1, record 4, English, - apparent%20precession%20error
Record number: 4, Textual support number: 1 OBS
apparent precession: Apparent change in the direction of the axis of rotation of a spinning body, as a gyroscope, due to rotation of the Earth. 2, record 4, English, - apparent%20precession%20error
Record 4, French
Record 4, Domaine(s)
- Mécanique générale (Physique)
- Pilotage et navigation aérienne
- Instruments de navigation
- Instruments et équipement de bord (Constructions aéronautiques)
Record 4, Main entry term, French
- erreur de précession apparente
1, record 4, French, erreur%20de%20pr%C3%A9cession%20apparente
correct, feminine noun
Record 4, Abbreviations, French
Record 4, Synonyms, French
Record 4, Textual support, French
Record number: 4, Textual support number: 1 CONT
Erreur de précession. Les forces de friction présentes dans le système gyroscopique engendrent la précession. Cette précession occasionne un «glissement» ou une «dérive» d'environ 3 degrés dans la lecture de l'instrument et ce, à toutes les 15 minutes. Le gyroscope est aussi sujet à la précession apparente. L'inertie gyroscopique garde le gyroscope fixe dans l'espace de sorte qu'il ne bouge pas par rapport à l'espace. Cependant, la Terre qui tourne en dessous du gyroscope donne à ce dernier un mouvement apparent par rapport à la Terre. La rotation de la Terre cause une dérive apparente, ou précession, qui varie avec la latitude [...] L'erreur de précession, à la fois mécanique et apparente, doit être corrigée à intervalles réguliers, c.-à-d. toutes les 15 minutes. 1, record 4, French, - erreur%20de%20pr%C3%A9cession%20apparente
Record number: 4, Textual support number: 1 OBS
précession apparente : Déviation apparente de l'axe d'un gyroscope par rapport à la Terre. Elle est due à la rotation terrestre et non pas à une force appliquée au gyroscope. 2, record 4, French, - erreur%20de%20pr%C3%A9cession%20apparente
Record 4, Spanish
Record 4, Textual support, Spanish
Record 5 - internal organization data 2002-07-16
Record 5, English
Record 5, Subject field(s)
- Flight Instruments and Equipment (Aeroindustry)
- Aircraft Piloting and Navigation
- Navigation Instruments
Record 5, Main entry term, English
- erecting mechanism
1, record 5, English, erecting%20mechanism
correct
Record 5, Abbreviations, English
Record 5, Synonyms, English
Record 5, Textual support, English
Record number: 5, Textual support number: 1 CONT
In a skidding turn, the gyro precesses towards the inside of the turn. After return on the aircraft to straight and level flight, the instrument shows a turn in the direction of the skid. In a normal turn, the gyro precesses towards the inside of the turn. The precession error is quickly corrected by the erecting mechanism. 2, record 5, English, - erecting%20mechanism
Record number: 5, Textual support number: 2 CONT
The only really tricky part of the attitude indicator is its erecting mechanism. When power(vacuum) is first applied to the instrument, the mechanism quickly erects the gyro spindle to plumb-vertical in order to align the artificial horizon with the natural horizon. In flight, the erecting mechanism continually compensates the gyro for precession errors in order to keep it aligned throughout the course of a long flight. The design of the erecting mechanism is quite clever. In an air-driven attitude gyro, there are "pendulous vanes" suspended from pivots attached to the lower portion of the sealed gyro housing, one vane for each exhaust port. The vanes are positioned so that, when the gyro is erect, each vane half-covers its associated exhaust port. If the gyro tilts so that its axle is not plumb, the pendulous vanes shift so that one exhaust port is more-than-half-covered and the opposite exhaust port is less-than-half-covered. The resulting imbalance of discharge air exerts a force on the rotor housing at right angles to the direction of tilt, causing the gyro to precess to the erect position. As soon as the gyro is erect, the pendulous vanes return to a balanced condition to remove the precessing force. Pure magic! The erecting mechanism can erect the gyro quite quickly at initial power-up because the gyro doesn’t exhibit much gyroscopic rigidity at low rotor RPMs. Typically, the horizon bar becomes level within the first 10 or 15 seconds, and then its oscillations(caused by precessional nutation of the gyro) are damped out within a minute or so as the rotor comes up-to-speed. 3, record 5, English, - erecting%20mechanism
Record 5, Key term(s)
- gyroscope erecting mechanism
- gyro erecting mechanism
- erection mechanism
Record 5, French
Record 5, Domaine(s)
- Instruments et équipement de bord (Constructions aéronautiques)
- Pilotage et navigation aérienne
- Instruments de navigation
Record 5, Main entry term, French
- mécanisme de redressement
1, record 5, French, m%C3%A9canisme%20de%20redressement
correct, masculine noun
Record 5, Abbreviations, French
Record 5, Synonyms, French
- mécanisme d'érection 2, record 5, French, m%C3%A9canisme%20d%27%C3%A9rection
correct, masculine noun
- système érecteur 3, record 5, French, syst%C3%A8me%20%C3%A9recteur
correct, masculine noun
- système d'érection 4, record 5, French, syst%C3%A8me%20d%27%C3%A9rection
correct, masculine noun
- asservissement de verticale 5, record 5, French, asservissement%20de%20verticale
correct, masculine noun
Record 5, Textual support, French
Record number: 5, Textual support number: 1 CONT
Dans un virage dérapé, le gyroscope «précesse» du côté du virage. Une fois l'avion revenu au vol rectiligne en palier, l'instrument indique un virage dans la direction du dérapage. Dans un virage normal, le gyroscope «précesse» du côté du virage. Le mécanisme de redressement du gyroscope corrige rapidement l'erreur de précession. 1, record 5, French, - m%C3%A9canisme%20de%20redressement
Record number: 5, Textual support number: 2 CONT
Description d'un Épervier [drone] [...] d. Le gyroscope vertical: Dans ce cas, les deux axes, ROLL et PITCH sont terminés par les potentiomètres qui détectent les écarts de positions angulaires du corps par rapport aux horizons roll et pitch. Les mécanismes d'érection ne sont prévus que pour maintenir la verticalité parfaite de la masse en rotation. 6, record 5, French, - m%C3%A9canisme%20de%20redressement
Record number: 5, Textual support number: 1 OBS
Horizon gyroscopique [...] La verticalité de l'axe de toupie [delta] est approximativement assurée par un érecteur (mécanique, électro-mécanique, pneumatique) produisant une raideur en quadrature de signe convenable. 7, record 5, French, - m%C3%A9canisme%20de%20redressement
Record 5, Key term(s)
- mécanisme de redressement du gyroscope
Record 5, Spanish
Record 5, Textual support, Spanish
Record 6 - internal organization data 2002-07-16
Record 6, English
Record 6, Subject field(s)
- General Mechanics (Physics)
- Flight Instruments and Equipment (Aeroindustry)
- Navigation Instruments
Record 6, Main entry term, English
- commanded precession rate
1, record 6, English, commanded%20precession%20rate
correct
Record 6, Abbreviations, English
Record 6, Synonyms, English
Record 6, Textual support, English
Record number: 6, Textual support number: 1 CONT
Controlled pendulum. The gyro spinning wheel is running at constant speed. The precession drive, which lies in a plane symmetric with respect to the gimbal is controlled to create a precession rate of the spinning wheel. Measurement of the rotation angle around the horizontal axis perpendicular to the symmetry plane of the gimbal is used to perform the precession control. This control aims to keep the center of gravity of the gimbal assembly over the rotation axis. The commanded precession rate is such that the gyroscopic torque counterbalances the gravity torque and the disturbing torques... 1, record 6, English, - commanded%20precession%20rate
Record 6, French
Record 6, Domaine(s)
- Mécanique générale (Physique)
- Instruments et équipement de bord (Constructions aéronautiques)
- Instruments de navigation
Record 6, Main entry term, French
- vitesse de précession commandée
1, record 6, French, vitesse%20de%20pr%C3%A9cession%20command%C3%A9e
correct, feminine noun
Record 6, Abbreviations, French
Record 6, Synonyms, French
Record 6, Textual support, French
Record number: 6, Textual support number: 1 CONT
Pendule asservi. La toupie gyroscopique est entraînée à vitesse constante. Le moteur de précession qui est dans le plan de symétrie du berceau est commandé pour produire une vitesse de basculement de la toupie. La mesure de l'angle de rotation autour de l'axe horizontal perpendiculaire au plan de symétrie du berceau est utilisée pour réaliser la commande du moteur de précession. Cette commande a pour but de maintenir le centre de gravité de l'ensemble à la verticale de l'axe de rotation horizontal. La vitesse de précession commandée est telle que le couple gyroscopique produit contre-balance le couple de gravité et les couples perturbateurs [...] 1, record 6, French, - vitesse%20de%20pr%C3%A9cession%20command%C3%A9e
Record 6, Spanish
Record 6, Textual support, Spanish
Record 7 - internal organization data 2002-07-05
Record 7, English
Record 7, Subject field(s)
- General Mechanics (Physics)
- Aircraft Piloting and Navigation
- Navigation Instruments
- Flight Instruments and Equipment (Aeroindustry)
Record 7, Main entry term, English
- gyroscopic torque
1, record 7, English, gyroscopic%20torque
correct, officially approved
Record 7, Abbreviations, English
Record 7, Synonyms, English
Record 7, Textual support, English
Record number: 7, Textual support number: 1 CONT
A CMG(control moment gyro) is an actuator consisting of a spinner with a sustained kinetic moment modulus h and one or two motor-driven tilt axes. One-axis CMGs are used to generate very high dynamic moments. The produced gyroscopic torque is proportional to h and to the precession rate(i. e. tilting rate). It is orthogonal to the precession axis and is directly transmitted to the satellite by the tilt motor bearings. 2, record 7, English, - gyroscopic%20torque
Record number: 7, Textual support number: 2 CONT
A novel design for an accelerometer using gyroscopic torque to null a pendulous proof mass is being micromachined. 3, record 7, English, - gyroscopic%20torque
Record number: 7, Textual support number: 1 OBS
gyroscopic torque: term officially approved by the International Civil Aviation Organization (ICAO). 4, record 7, English, - gyroscopic%20torque
Record 7, French
Record 7, Domaine(s)
- Mécanique générale (Physique)
- Pilotage et navigation aérienne
- Instruments de navigation
- Instruments et équipement de bord (Constructions aéronautiques)
Record 7, Main entry term, French
- couple gyroscopique
1, record 7, French, couple%20gyroscopique
correct, masculine noun, officially approved
Record 7, Abbreviations, French
Record 7, Synonyms, French
Record 7, Textual support, French
Record number: 7, Textual support number: 1 CONT
Couple gyroscopique. C'est [...] une conséquence de l'inertie du gyroscope : un gyroscope réagit par un couple chaque fois que l'on veut lui imposer une rotation suivant un axe différent de son axe de rotation propre. Ce couple s'appelle couple gyroscopique et tend en général à faire basculer l'axe du rotor. 2, record 7, French, - couple%20gyroscopique
Record number: 7, Textual support number: 2 CONT
En présence d'un gyroscope on peut considérer ce gyroscope bloqué sur son carter (rotation «oubliée»), à condition de rajouter au moment des forces extérieures un moment supplémentaire, le couple gyroscopique, compensant les effets de la rotation «oubliée». 2, record 7, French, - couple%20gyroscopique
Record number: 7, Textual support number: 1 OBS
couple gyroscopique : terme uniformisé par l'Organisation de l'aviation civile internationale (OACI). 3, record 7, French, - couple%20gyroscopique
Record 7, Spanish
Record 7, Campo(s) temático(s)
- Mecánica general (Física)
- Pilotaje y navegación aérea
- Instrumentos de navegación
- Instrumentos y equipo de vuelo (Industria aeronáutica)
Record 7, Main entry term, Spanish
- par giroscópico
1, record 7, Spanish, par%20girosc%C3%B3pico
correct, masculine noun, officially approved
Record 7, Abbreviations, Spanish
Record 7, Synonyms, Spanish
Record 7, Textual support, Spanish
Record number: 7, Textual support number: 1 OBS
par giroscópico : término aceptado oficialmente por la Organización de Aviación Civil Internacional (OACI). 2, record 7, Spanish, - par%20girosc%C3%B3pico
Record 8 - internal organization data 2002-04-17
Record 8, English
Record 8, Subject field(s)
- Flight Instruments and Equipment (Aeroindustry)
- Aircraft Piloting and Navigation
- Navigation Instruments
Record 8, Main entry term, English
- controlled pendulum
1, record 8, English, controlled%20pendulum
correct
Record 8, Abbreviations, English
Record 8, Synonyms, English
Record 8, Textual support, English
Record number: 8, Textual support number: 1 CONT
Controlled pendulum. The gyro spinning wheel is running at constant speed. The precession drive, which lies in a plane symmetric with respect to the gimbal is controlled to create a precession rate of the spinning wheel. Measurement of the rotation angle around the horizontal axis perpendicular to the symmetry plane of the gimbal is used to perform the precession control. This control aims to keep the center of gravity of the gimbal assembly over the rotation axis. The commanded precession rate is such that the gyroscopic torque counterbalances the gravity torque and the disturbing torques... 1, record 8, English, - controlled%20pendulum
Record 8, French
Record 8, Domaine(s)
- Instruments et équipement de bord (Constructions aéronautiques)
- Pilotage et navigation aérienne
- Instruments de navigation
Record 8, Main entry term, French
- pendule asservi
1, record 8, French, pendule%20asservi
correct, masculine noun
Record 8, Abbreviations, French
Record 8, Synonyms, French
Record 8, Textual support, French
Record number: 8, Textual support number: 1 CONT
Pendule asservi. La toupie gyroscopique est entraînée à vitesse constante. Le moteur de précession qui est dans le plan de symétrie du berceau est commandé pour produire une vitesse de basculement de la toupie. La mesure de l'angle de rotation autour de l'axe horizontal perpendiculaire au plan de symétrie du berceau est utilisée pour réaliser la commande du moteur de précession. Cette commande a pour but de maintenir le centre de gravité de l'ensemble à la verticale de l'axe de rotation horizontal. La vitesse de précession commandée est telle que le couple gyroscopique produit contre-balance le couple de gravité et les couples perturbateurs [...] 1, record 8, French, - pendule%20asservi
Record 8, Spanish
Record 8, Textual support, Spanish
Record 9 - internal organization data 2002-01-10
Record 9, English
Record 9, Subject field(s)
- Flight Instruments and Equipment (Aeroindustry)
- Aircraft Piloting and Navigation
- Navigation Instruments
Record 9, Main entry term, English
- two-axis CMG
1, record 9, English, two%2Daxis%20CMG
correct
Record 9, Abbreviations, English
Record 9, Synonyms, English
- two-axis control moment gyro 2, record 9, English, two%2Daxis%20control%20moment%20gyro
correct
Record 9, Textual support, English
Record number: 9, Textual support number: 1 CONT
A CMG(control moment gyro) is an actuator consisting of a spinner with a sustained kinetic moment modulus h and one or two motor-driven tilt axes. One-axis CMGs are used to generate very high dynamic moments. The produced gyroscopic torque is proportional to h and to the precession rate(i. e. tilting rate). It is orthogonal to the precession axis and is directly transmitted to the satellite by the tilt motor bearings. Two-axis CMGs are less used and have a limited dynamic moment since the produced gyroscopic torque has to be partially compensated by the tilt motor. 1, record 9, English, - two%2Daxis%20CMG
Record 9, Key term(s)
- 2-axis CMG
- 2-axis control moment gyro
Record 9, French
Record 9, Domaine(s)
- Instruments et équipement de bord (Constructions aéronautiques)
- Pilotage et navigation aérienne
- Instruments de navigation
Record 9, Main entry term, French
- gyrodyne 2-axes
1, record 9, French, gyrodyne%202%2Daxes
correct, masculine noun
Record 9, Abbreviations, French
Record 9, Synonyms, French
- actionneur gyroscopique 2-axes 2, record 9, French, actionneur%20gyroscopique%202%2Daxes
correct, masculine noun
Record 9, Textual support, French
Record number: 9, Textual support number: 1 CONT
On distingue les gyrodynes 1-axe (une seule vitesse cardan commandée par toupie, en précession) dont le couple moteur est directement transmis au satellite par les bâtis et les gyrodynes 2-axes montés sur un double cardan avec vitesses de précession et nutation commandées. Dans ce cas, l'effet d'amplification de couple --le fait qu'un faible couple autour de l'axe de précession produise un fort couple autour de l'axe perpendiculaire-- est moins important car le moteur de précession autour d'un des axes doit surpasser les couples de précession produits par l'autre. Les études menées au DCSD portent principalement sur les «grappes» : ensemble de gyrodynes 1-axe commandés simultanément. 1, record 9, French, - gyrodyne%202%2Daxes
Record number: 9, Textual support number: 1 OBS
Les gyrodynes : une technologie prometteuse pour la commande d'attitude des satellites. Également appelé actionneur gyroscopique, le gyrodyne est une commande d'attitude utilisant des actionneurs à fort couple dynamique. 3, record 9, French, - gyrodyne%202%2Daxes
Record 9, Key term(s)
- gyrodyne deux-axes
- actionneur gyroscopique deux-axes
Record 9, Spanish
Record 9, Textual support, Spanish
Record 10 - internal organization data 2001-11-15
Record 10, English
Record 10, Subject field(s)
- General Mechanics (Physics)
- Aircraft Piloting and Navigation
- Navigation Instruments
- Flight Instruments and Equipment (Aeroindustry)
Record 10, Main entry term, English
- mechanical precession
1, record 10, English, mechanical%20precession
correct
Record 10, Abbreviations, English
Record 10, Synonyms, English
Record 10, Textual support, English
Record number: 10, Textual support number: 1 CONT
Precession error. Frictional forces in the gyro system cause it to precess. This precession causes a creep or drift in the reading on the card, amounting approximately 3 degrees in 15 minutes. The gyro is also subject to apparent precession. Gyroscopic inertia keeps the spinning gyro fixed in space so that, relative to space, it does not move. But the earth rotating underneath it gives it an apparent motion relative to the earth. This causes an apparent drift, or precession, which varies with latitude... Precession error, both mechanical and apparent, must be corrected for at regular intervals of about 15 minutes. 1, record 10, English, - mechanical%20precession
Record 10, French
Record 10, Domaine(s)
- Mécanique générale (Physique)
- Pilotage et navigation aérienne
- Instruments de navigation
- Instruments et équipement de bord (Constructions aéronautiques)
Record 10, Main entry term, French
- précession mécanique
1, record 10, French, pr%C3%A9cession%20m%C3%A9canique
correct, feminine noun
Record 10, Abbreviations, French
Record 10, Synonyms, French
- précession instrumentale 2, record 10, French, pr%C3%A9cession%20instrumentale
correct, feminine noun
Record 10, Textual support, French
Record number: 10, Textual support number: 1 CONT
Erreur de précession. Les forces de friction présentes dans le système gyroscopique engendrent la précession. Cette précession occasionne un «glissement» ou une «dérive» d'environ 3 degrés dans la lecture de l'instrument et ce, à toutes les 15 minutes. Le gyroscope est aussi sujet à la précession apparente. L'inertie gyroscopique garde le gyroscope fixe dans l'espace de sorte qu'il ne bouge pas par rapport à l'espace. Cependant, la terre qui tourne en dessous du gyroscope donne à ce dernier un mouvement apparent par rapport à la terre. La rotation de la terre cause une dérive apparente, ou précession, qui varie avec la latitude [...] L'erreur de précession, à la fois mécanique et apparente, doit être corrigée à intervalles réguliers, c.-à-d. toutes les 15 minutes. 3, record 10, French, - pr%C3%A9cession%20m%C3%A9canique
Record number: 10, Textual support number: 2 CONT
Le compas gyromagnétique a une précession instrumentale Pi = - 1°/h (1 degré/heure vers la droite). 2, record 10, French, - pr%C3%A9cession%20m%C3%A9canique
Record number: 10, Textual support number: 3 CONT
Question 22 [...] Si le compas ne possède pas de dispositif de correction de taux horaire et si le gyro a une précession mécanique nulle, la valeur du cap gyro à 13h30min UTC est : A » Cgy = 249°; B » Cgy = 275,5°; C » Cgy = 254,5°; D » Cgy = 281°. 4, record 10, French, - pr%C3%A9cession%20m%C3%A9canique
Record number: 10, Textual support number: 1 PHR
Précession astronomique, de déplacement. 2, record 10, French, - pr%C3%A9cession%20m%C3%A9canique
Record 10, Spanish
Record 10, Textual support, Spanish
Record 11 - internal organization data 2001-09-24
Record 11, English
Record 11, Subject field(s)
- General Mechanics (Physics)
- Aircraft Piloting and Navigation
- Navigation Instruments
- Flight Instruments and Equipment (Aeroindustry)
Record 11, Main entry term, English
- gyroscopic reaction torque
1, record 11, English, gyroscopic%20reaction%20torque
correct
Record 11, Abbreviations, English
Record 11, Synonyms, English
Record 11, Textual support, English
Record number: 11, Textual support number: 1 CONT
GyroTorque Operating Principle. Gyroscopic reaction torque is generated when precessing a spinning rotor. A very common form of gyroscopic reaction is experienced when riding a bicycle, where the front wheel exhibits the properties of a gyroscopic rotor. If, as is too often the case, an off-balance torque is created by gravitational force, the rider intuitively counters the gravitational torque by turning the handle bar, which, in effect, amounts to precessing the rotor-like front wheel. The faster the bicycle is travelling, the greater is the spin of the front wheel and, hence, the smaller is the precession required to counter the off-balance torque. The operational advantages of GyroTorque result from a novel technique of generation and rectification of gyroscopic reaction torque from a rotor as it is applied to an input-independent output shaft. 1, record 11, English, - gyroscopic%20reaction%20torque
Record 11, Key term(s)
- gyrotorque
- gyro-torque
Record 11, French
Record 11, Domaine(s)
- Mécanique générale (Physique)
- Pilotage et navigation aérienne
- Instruments de navigation
- Instruments et équipement de bord (Constructions aéronautiques)
Record 11, Main entry term, French
- couple de réaction gyroscopique
1, record 11, French, couple%20de%20r%C3%A9action%20gyroscopique
correct, masculine noun
Record 11, Abbreviations, French
Record 11, Synonyms, French
Record 11, Textual support, French
Record number: 11, Textual support number: 1 CONT
La force centrifuge agit dans le même sens que le couple de réaction gyroscopique. 1, record 11, French, - couple%20de%20r%C3%A9action%20gyroscopique
Record 11, Spanish
Record 11, Textual support, Spanish
Record 12 - internal organization data 2001-09-10
Record 12, English
Record 12, Subject field(s)
- Flight Instruments and Equipment (Aeroindustry)
- Aircraft Piloting and Navigation
- Navigation Instruments
- Launching and Space Maneuvering
Record 12, Main entry term, English
- one-axis CMG
1, record 12, English, one%2Daxis%20CMG
correct
Record 12, Abbreviations, English
Record 12, Synonyms, English
- one-axis control moment gyro 2, record 12, English, one%2Daxis%20control%20moment%20gyro
correct
Record 12, Textual support, English
Record number: 12, Textual support number: 1 CONT
A CMG(control moment gyro) is an actuator consisting of a spinner with a sustained kinetic moment modulus h and one or two motor-driven tilt axes. One-axis CMGs are used to generate very high dynamic moments. The produced gyroscopic torque is proportional to h and to the precession rate(i. e. tilting rate). 1, record 12, English, - one%2Daxis%20CMG
Record 12, Key term(s)
- 1-axis CMG
- 1-axis control moment gyro
Record 12, French
Record 12, Domaine(s)
- Instruments et équipement de bord (Constructions aéronautiques)
- Pilotage et navigation aérienne
- Instruments de navigation
- Lancement et manœuvres dans l'espace
Record 12, Main entry term, French
- gyrodyne 1-axe
1, record 12, French, gyrodyne%201%2Daxe
correct, masculine noun
Record 12, Abbreviations, French
Record 12, Synonyms, French
- actionneur gyroscopique 1-axe 2, record 12, French, actionneur%20gyroscopique%201%2Daxe
correct, masculine noun
Record 12, Textual support, French
Record number: 12, Textual support number: 1 CONT
On distingue les gyrodynes 1-axe (une seule vitesse cardan commandée par toupie, en précession) dont le couple moteur est directement transmis au satellite par les bâtis et les gyrodynes 2-axes montés sur un double cardan avec vitesses de précession et nutation commandées. Dans ce cas, l'effet d'amplification de couple --le fait qu'un faible couple autour de l'axe de précession produise un fort couple autour de l'axe perpendiculaire-- est moins important car le moteur de précession autour d'un des axes doit surpasser les couples de précession produits par l'autre. Les études menées au DCSD portent principalement sur les «grappes» : ensemble de gyrodynes 1-axe commandés simultanément. 1, record 12, French, - gyrodyne%201%2Daxe
Record number: 12, Textual support number: 1 OBS
Les gyrodynes : une technologie prometteuse pour la commande d'attitude des satellites. Également appelé actionneur gyroscopique, le gyrodyne est une commande d'attitude utilisant des actionneurs à fort couple dynamique. 3, record 12, French, - gyrodyne%201%2Daxe
Record 12, Key term(s)
- gyrodyne un-axe
- actionneur gyroscopique un-axe
Record 12, Spanish
Record 12, Textual support, Spanish
Record 13 - internal organization data 2001-09-10
Record 13, English
Record 13, Subject field(s)
- General Mechanics (Physics)
- Flight Instruments and Equipment (Aeroindustry)
- Navigation Instruments
Record 13, Main entry term, English
- disturbing torque
1, record 13, English, disturbing%20torque
correct
Record 13, Abbreviations, English
Record 13, Synonyms, English
Record 13, Textual support, English
Record number: 13, Textual support number: 1 CONT
Controlled pendulum. The gyro spinning wheel is running at constant speed. The precession drive, which lies in a plane symmetric with respect to the gimbal is controlled to create a precession rate of the spinning wheel. Measurement of the rotation angle around the horizontal axis perpendicular to the symmetry plane of the gimbal is used to perform the precession control. This control aims to keep the center of gravity of the gimbal assembly over the rotation axis. The commanded precession rate is such that the gyroscopic torque counterbalances the gravity torque and the disturbing torques... 2, record 13, English, - disturbing%20torque
Record 13, French
Record 13, Domaine(s)
- Mécanique générale (Physique)
- Instruments et équipement de bord (Constructions aéronautiques)
- Instruments de navigation
Record 13, Main entry term, French
- couple perturbateur
1, record 13, French, couple%20perturbateur
correct, masculine noun
Record 13, Abbreviations, French
Record 13, Synonyms, French
Record 13, Textual support, French
Record number: 13, Textual support number: 1 CONT
Pendule asservi. La toupie gyroscopique est entraînée à vitesse constante. Le moteur de précession qui est dans le plan de symétrie du berceau est commandé pour produire une vitesse de basculement de la toupie. La mesure de l'angle de rotation autour de l'axe horizontal perpendiculaire au plan de symétrie du berceau est utilisée pour réaliser la commande du moteur de précession. Cette commande a pour but de maintenir le centre de gravité de l'ensemble à la verticale de l'axe de rotation horizontal. La vitesse de précession commandée est telle que le couple gyroscopique produit contre-balance le couple de gravité et les couples perturbateurs [...] 2, record 13, French, - couple%20perturbateur
Record 13, Spanish
Record 13, Textual support, Spanish
Record 14 - internal organization data 2001-09-10
Record 14, English
Record 14, Subject field(s)
- General Mechanics (Physics)
- Aircraft Piloting and Navigation
- Navigation Instruments
- Flight Instruments and Equipment (Aeroindustry)
Record 14, Main entry term, English
- gravity torque
1, record 14, English, gravity%20torque
correct
Record 14, Abbreviations, English
Record 14, Synonyms, English
- gravity-induced torque 2, record 14, English, gravity%2Dinduced%20torque
correct
Record 14, Textual support, English
Record number: 14, Textual support number: 1 CONT
Gyroscopic pendulum. Free pendulum. The gyro spinning wheel is running at constant speed. The precession drive, which lies in a plane symmetric with respect to the gimbal is not controlled. When the gimbal becomes free, the gravity torque drives it around the horizontal axis, perpendicular to the symmetry plane, until it falls on the top. 1, record 14, English, - gravity%20torque
Record number: 14, Textual support number: 2 CONT
The motion induced in a gyroscope by an applied force follows a simple rule. When the spinning top, for example, is acted upon by a gravity-induced torque, the original rotational motion tries to align itself with the added rotational motion of the torque. The motion, or precession, of the gyroscope that results is perpendicular to the applied torque. In other words, the spin vector tries to align itself with the torque vector; ... 2, record 14, English, - gravity%20torque
Record 14, French
Record 14, Domaine(s)
- Mécanique générale (Physique)
- Pilotage et navigation aérienne
- Instruments de navigation
- Instruments et équipement de bord (Constructions aéronautiques)
Record 14, Main entry term, French
- couple de gravité
1, record 14, French, couple%20de%20gravit%C3%A9
correct, masculine noun
Record 14, Abbreviations, French
Record 14, Synonyms, French
Record 14, Textual support, French
Record number: 14, Textual support number: 1 CONT
Pendule gyroscopique. Pendule libre. La toupie gyroscopique est entraînée à vitesse constante. Le moteur de précession qui est dans le plan de symétrie du berceau n'est pas commandé. Quand on lâche le berceau, le couple de gravité fait tourner le berceau autour de son axe horizontal perpendiculaire à son plan de symétrie jusqu'à tomber sur la butée. Cette vitesse de rotation induit un couple gyroscopique qui fait basculer la toupie autour de son axe de précession malgré la résistance du réducteur du moteur de précession. 1, record 14, French, - couple%20de%20gravit%C3%A9
Record 14, Spanish
Record 14, Textual support, Spanish
Record 15 - internal organization data 2001-09-10
Record 15, English
Record 15, Subject field(s)
- Gears and Friction Wheels
- Flight Instruments and Equipment (Aeroindustry)
Record 15, Main entry term, English
- gear of the precession drive
1, record 15, English, gear%20of%20the%20precession%20drive
correct
Record 15, Abbreviations, English
Record 15, Synonyms, English
Record 15, Textual support, English
Record number: 15, Textual support number: 1 CONT
Gyroscopic pendulum. Free pendulum. The gyro spinning wheel is running at constant speed. The precession drive, which lies in a plane symmetric with respect to the gimbal is not controlled. When the gimbal becomes free, the gravity torque drives it around the horizontal axis, perpendicular to the symmetry plane, until it falls on the top. This rate of rotation of the gimbal creates a gyroscopic torque that makes the spinner rotate around the precession axis in spite of the friction due to the gear of the precession drive. 1, record 15, English, - gear%20of%20the%20precession%20drive
Record 15, Key term(s)
- precession drive gear
Record 15, French
Record 15, Domaine(s)
- Engrenages et roues de friction
- Instruments et équipement de bord (Constructions aéronautiques)
Record 15, Main entry term, French
- réducteur du moteur de précession
1, record 15, French, r%C3%A9ducteur%20du%20moteur%20de%20pr%C3%A9cession
correct, masculine noun
Record 15, Abbreviations, French
Record 15, Synonyms, French
Record 15, Textual support, French
Record number: 15, Textual support number: 1 CONT
Pendule gyroscopique. Pendule libre. La toupie gyroscopique est entraînée à vitesse constante. Le moteur de précession qui est dans le plan de symétrie du berceau n'est pas commandé. Quand on lâche le berceau, le couple de gravité fait tourner le berceau autour de son axe horizontal perpendiculaire à son plan de symétrie jusqu'à tomber sur la butée. Cette vitesse de rotation induit un couple gyroscopique qui fait basculer la toupie autour de son axe de précession malgré la résistance du réducteur du moteur de précession. 1, record 15, French, - r%C3%A9ducteur%20du%20moteur%20de%20pr%C3%A9cession
Record 15, Spanish
Record 15, Textual support, Spanish
Record 16 - internal organization data 2001-09-10
Record 16, English
Record 16, Subject field(s)
- General Mechanics (Physics)
- Aircraft Piloting and Navigation
- Navigation Instruments
- Flight Instruments and Equipment (Aeroindustry)
Record 16, Main entry term, English
- precession drive
1, record 16, English, precession%20drive
correct
Record 16, Abbreviations, English
Record 16, Synonyms, English
- precession motor 2, record 16, English, precession%20motor
correct
Record 16, Textual support, English
Record number: 16, Textual support number: 1 CONT
Gyroscopic pendulum. Free pendulum. The gyro spinning wheel is running at constant speed. The precession drive, which lies in a plane symmetric with respect to the gimbal is not controlled. When the gimbal becomes free, the gravity torque drives it around the horizontal axis, perpendicular to the symmetry plane, until it falls on the top. 1, record 16, English, - precession%20drive
Record 16, French
Record 16, Domaine(s)
- Mécanique générale (Physique)
- Pilotage et navigation aérienne
- Instruments de navigation
- Instruments et équipement de bord (Constructions aéronautiques)
Record 16, Main entry term, French
- moteur de précession
1, record 16, French, moteur%20de%20pr%C3%A9cession
correct, masculine noun
Record 16, Abbreviations, French
Record 16, Synonyms, French
Record 16, Textual support, French
Record number: 16, Textual support number: 1 CONT
On distingue les gyrodynes 1-axe (une seule vitesse cardan commandée par toupie, en précession) dont le couple moteur est directement transmis au satellite par les bâtis et les gyrodynes 2-axes montés sur un double cardan avec vitesses de précession et nutation commandées. Dans ce cas, l'effet d'amplification de couple --le fait qu'un faible couple autour de l'axe de précession produise un fort couple autour de l'axe perpendiculaire-- est moins important car le moteur de précession autour d'un des axes doit surpasser les couples de précession produits par l'autre. Les études menées au DCSD [Département Commande des Systèmes et Dynamique du Vol] portent principalement sur les «grappes» : ensemble de gyrodynes 1-axe commandés simultanément. 2, record 16, French, - moteur%20de%20pr%C3%A9cession
Record 16, Spanish
Record 16, Textual support, Spanish
Record 17 - internal organization data 2001-09-10
Record 17, English
Record 17, Subject field(s)
- Physics
- Aircraft Piloting and Navigation
- Navigation Instruments
- Flight Instruments and Equipment (Aeroindustry)
Record 17, Main entry term, English
- free pendulum
1, record 17, English, free%20pendulum
correct
Record 17, Abbreviations, English
Record 17, Synonyms, English
Record 17, Textual support, English
Record number: 17, Textual support number: 1 CONT
Gyroscopic pendulum. Free pendulum. The gyro spinning wheel is running at constant speed. The precession drive, which lies in a plane symmetric with respect to the gimbal is not controlled. When the gimbal becomes free, the gravity torque drives it around the horizontal axis, perpendicular to the symmetry plane, until it falls on the top. 1, record 17, English, - free%20pendulum
Record 17, French
Record 17, Domaine(s)
- Physique
- Pilotage et navigation aérienne
- Instruments de navigation
- Instruments et équipement de bord (Constructions aéronautiques)
Record 17, Main entry term, French
- pendule libre
1, record 17, French, pendule%20libre
correct, masculine noun
Record 17, Abbreviations, French
Record 17, Synonyms, French
Record 17, Textual support, French
Record number: 17, Textual support number: 1 CONT
Pendule gyroscopique. Pendule libre. La toupie gyroscopique est entraînée à vitesse constante. Le moteur de précession qui est dans le plan de symétrie du berceau n'est pas commandé. Quant on lâche le berceau, le couple de gravité fait tourner le berceau autour de son axe horizontal perpendiculaire à son plan de symétrie jusqu'à tomber sur la butée. Cette vitesse de rotation induit un couple gyroscopique qui fait basculer la toupie autour de son axe de précession malgré la résistance du réducteur du moteur de précession. 2, record 17, French, - pendule%20libre
Record 17, Spanish
Record 17, Textual support, Spanish
Record 18 - internal organization data 2001-09-10
Record 18, English
Record 18, Subject field(s)
- Flight Instruments and Equipment (Aeroindustry)
- Aircraft Piloting and Navigation
- Navigation Instruments
Record 18, Main entry term, English
- stop
1, record 18, English, stop
correct, noun
Record 18, Abbreviations, English
Record 18, Synonyms, English
Record 18, Textual support, English
Record number: 18, Textual support number: 1 CONT
Gyroscopic pendulum. Free pendulum. The gyro spinning wheel is running at constant speed. The precession drive, which lies in a plane symmetric with respect to the gimbal is not controlled. When the gimbal becomes free, the gravity torque drives it around the horizontal axis, perpendicular to the symmetry plane, until it falls on the stop. 1, record 18, English, - stop
Record 18, French
Record 18, Domaine(s)
- Instruments et équipement de bord (Constructions aéronautiques)
- Pilotage et navigation aérienne
- Instruments de navigation
Record 18, Main entry term, French
- butée
1, record 18, French, but%C3%A9e
correct, feminine noun
Record 18, Abbreviations, French
Record 18, Synonyms, French
Record 18, Textual support, French
Record number: 18, Textual support number: 1 CONT
Pendule gyroscopique. Pendule libre. Le toupie gyroscopique est entraînée à vitesse constante. Le moteur de précession qui est dans le plan de symétrie du berceau n'est pas commandé. Quand on lâche le berceau, le couple de gravité fait tourner le berceau autour de son axe horizontal perpendiculaire à son plan de symétrie jusqu'à tomber sur la butée. Cette vitesse de rotation induit un couple gyroscopique qui fait basculer la toupie autour de son axe de précession malgré la résistance du réducteur du moteur de précession. 1, record 18, French, - but%C3%A9e
Record 18, Spanish
Record 18, Textual support, Spanish
Record 19 - internal organization data 2001-09-06
Record 19, English
Record 19, Subject field(s)
- General Mechanics (Physics)
Record 19, Main entry term, English
- gyroscopic pendulum
1, record 19, English, gyroscopic%20pendulum
correct
Record 19, Abbreviations, English
Record 19, Synonyms, English
Record 19, Textual support, English
Record number: 19, Textual support number: 1 CONT
Gyroscopic pendulum. Free pendulum. The gyro spinning wheel is running at constant speed. The precession drive, which lies in a plane symmetric with respect to the gimbal is not controlled. When the gimbal becomes free, the gravity torque drives it around the horizontal axis, perpendicular to the symmetry plane, until it falls on the top. 1, record 19, English, - gyroscopic%20pendulum
Record 19, French
Record 19, Domaine(s)
- Mécanique générale (Physique)
Record 19, Main entry term, French
- pendule gyroscopique
1, record 19, French, pendule%20gyroscopique
correct, masculine noun
Record 19, Abbreviations, French
Record 19, Synonyms, French
Record 19, Textual support, French
Record number: 19, Textual support number: 1 CONT
Pendule gyroscopique. Pendule libre. La toupie gyroscopique est entraînée à vitesse constante. Le moteur de précession qui est dans le plan de symétrie du berceau n'est pas commandé. Quand on lâche le berceau, le couple de gravité fait tourner le berceau autour de son axe horizontal perpendiculaire à son plan de symétrie jusqu'à tomber sur la butée. Cette vitesse de rotation induit un couple gyroscopique qui fait basculer la toupie autour de son axe de précession malgré la résistance du réducteur du moteur de précession. 1, record 19, French, - pendule%20gyroscopique
Record 19, Spanish
Record 19, Textual support, Spanish
Record 20 - internal organization data 2001-09-04
Record 20, English
Record 20, Subject field(s)
- General Mechanics (Physics)
- Aircraft Piloting and Navigation
- Navigation Instruments
- Flight Instruments and Equipment (Aeroindustry)
Record 20, Main entry term, English
- principle of precession
1, record 20, English, principle%20of%20precession
correct
Record 20, Abbreviations, English
Record 20, Synonyms, English
- gyroscopic precession principle 2, record 20, English, gyroscopic%20precession%20principle
correct
- law of precession 3, record 20, English, law%20of%20precession
correct
Record 20, Textual support, English
Record number: 20, Textual support number: 1 CONT
Gyroscopic Precession Principle : When a force is applied to a spinning gyro, the maximum reaction occurs 90° later in the direction of rotation. 2, record 20, English, - principle%20of%20precession
Record number: 20, Textual support number: 2 CONT
Precision Gyroscope. For demonstration of gyroscopic stabilization, gyrocompass, inertial guidance, principle of precession, etc. Dynamically-balanced, metallic rotor disc is mounted on a gimbal ring with cone bearings. Included are a plastic base with pivot cradle, and a second base with gimbal cradle. Cord included for rotating the rotor disc. With instructions. 4, record 20, English, - principle%20of%20precession
Record 20, Key term(s)
- precession law
- precession principle
Record 20, French
Record 20, Domaine(s)
- Mécanique générale (Physique)
- Pilotage et navigation aérienne
- Instruments de navigation
- Instruments et équipement de bord (Constructions aéronautiques)
Record 20, Main entry term, French
- loi de précession
1, record 20, French, loi%20de%20pr%C3%A9cession
correct, feminine noun
Record 20, Abbreviations, French
Record 20, Synonyms, French
- principe de la précession 2, record 20, French, principe%20de%20la%20pr%C3%A9cession
correct, masculine noun
Record 20, Textual support, French
Record number: 20, Textual support number: 1 CONT
L'indicateur de virage est un gyromètre utilisant la loi de précession d'un gyroscope à un degré de liberté. Il indique le taux et le sens de virage. 1, record 20, French, - loi%20de%20pr%C3%A9cession
Record number: 20, Textual support number: 2 CONT
Principe de la précession. La précession est le mouvement conique, séculaire que décrit l'axe des pôles terrestre. 2, record 20, French, - loi%20de%20pr%C3%A9cession
Record 20, Key term(s)
- loi de précession d'un gyroscope
Record 20, Spanish
Record 20, Textual support, Spanish
Record 21 - internal organization data 2001-08-17
Record 21, English
Record 21, Subject field(s)
- Flight Instruments and Equipment (Aeroindustry)
- Aircraft Piloting and Navigation
- Navigation Instruments
Record 21, Main entry term, English
- initial erection
1, record 21, English, initial%20erection
correct
Record 21, Abbreviations, English
Record 21, Synonyms, English
Record 21, Textual support, English
Record number: 21, Textual support number: 1 DEF
The mode of operation of a vertical gyro in which the gyro is being erected or slaved initially. 2, record 21, English, - initial%20erection
Record number: 21, Textual support number: 1 CONT
Gyroscopic instruments... Once the artificial horizon line is aligned with the natural horizon of the earth during initial erection, the artificial horizon is kept horizontal by the gyro on which it is mounted. An erection mechanism automatically rights the gyro when precession occurs due to maneuvers or friction. When the older-type gyro tumbles as a result of extreme attitude changes, the rotor normally precesses slowly back to the horizontal plane. Even an attitude indicator in perfect condition can give slight erroneous readings. Small errors due to acceleration and deceleration are not significant because the erection device corrects them promptly; nonetheless, the pilot should be aware of them... 3, record 21, English, - initial%20erection
Record number: 21, Textual support number: 1 OBS
The initial erection rate is usually relatively high. 4, record 21, English, - initial%20erection
Record 21, French
Record 21, Domaine(s)
- Instruments et équipement de bord (Constructions aéronautiques)
- Pilotage et navigation aérienne
- Instruments de navigation
Record 21, Main entry term, French
- érection initiale
1, record 21, French, %C3%A9rection%20initiale
correct, feminine noun
Record 21, Abbreviations, French
Record 21, Synonyms, French
- redressement initial 2, record 21, French, redressement%20initial
masculine noun
Record 21, Textual support, French
Record 21, Spanish
Record 21, Textual support, Spanish
Record 22 - internal organization data 2001-08-07
Record 22, English
Record 22, Subject field(s)
- General Mechanics (Physics)
- Aircraft Piloting and Navigation
- Navigation Instruments
- Flight Instruments and Equipment (Aeroindustry)
Record 22, Main entry term, English
- mechanical precession error
1, record 22, English, mechanical%20precession%20error
correct
Record 22, Abbreviations, English
Record 22, Synonyms, English
Record 22, Textual support, English
Record number: 22, Textual support number: 1 CONT
Precession error. Frictional forces in the gyros system cause it to precess. This precession causes a creep or drift in the reading on the card, amounting approximately 3 degrees in 15 minutes. The gyro is also subject to apparent precession. Gyroscopic inertia keeps the spinning gyro fixed in space so that, relative to space, it does not move. But the earth rotating underneath it gives it an apparent motion relative to the earth. This causes an apparent drift, or precession, which varies with latitude... Precession error, both mechanical and apparent, must be corrected for at regular intervals of about 15 minutes. 1, record 22, English, - mechanical%20precession%20error
Record 22, French
Record 22, Domaine(s)
- Mécanique générale (Physique)
- Pilotage et navigation aérienne
- Instruments de navigation
- Instruments et équipement de bord (Constructions aéronautiques)
Record 22, Main entry term, French
- erreur de précession mécanique
1, record 22, French, erreur%20de%20pr%C3%A9cession%20m%C3%A9canique
correct, feminine noun
Record 22, Abbreviations, French
Record 22, Synonyms, French
- erreur de précession instrumentale 2, record 22, French, erreur%20de%20pr%C3%A9cession%20instrumentale
feminine noun
Record 22, Textual support, French
Record number: 22, Textual support number: 1 CONT
Erreur de précession. Les forces de friction présentes dans le système gyroscopique engendrent la précession. Cette précession occasionne un «glissement» ou une «dérive» d'environ 3 degrés dans la lecture de l'instrument et ce, à toutes les 15 minutes. Le gyroscope est aussi sujet à la précession apparente. L'inertie gyroscopique garde le gyroscope fixe dans l'espace de sorte qu'il ne bouge pas par rapport à l'espace. Cependant, la terre qui tourne en dessous du gyroscope donne à ce dernier un mouvement apparent par rapport à la terre. La rotation de la terre cause une dérive apparente, ou précession, qui varie avec la latitude [...] L'erreur de précession, à la fois mécanique et apparente, doit être corrigée à intervalles réguliers, c.-à-d. toutes les 15 minutes. 1, record 22, French, - erreur%20de%20pr%C3%A9cession%20m%C3%A9canique
Record number: 22, Textual support number: 1 OBS
Le compas gyromagnétique a une précession instrumentale Pi = - 1°/h (1 degré/heure vers la droite). 3, record 22, French, - erreur%20de%20pr%C3%A9cession%20m%C3%A9canique
Record 22, Spanish
Record 22, Textual support, Spanish
Record 23 - internal organization data 2001-08-07
Record 23, English
Record 23, Subject field(s)
- General Mechanics (Physics)
- Aircraft Piloting and Navigation
- Navigation Instruments
- Flight Instruments and Equipment (Aeroindustry)
Record 23, Main entry term, English
- precession error
1, record 23, English, precession%20error
correct
Record 23, Abbreviations, English
Record 23, Synonyms, English
Record 23, Textual support, English
Record number: 23, Textual support number: 1 CONT
Precession error. Frictional forces in the gyros system cause it to precess. This precession causes a creep or drift in the reading on the card, amounting approximately 3 degrees in 15 minutes. The gyro is also subject to apparent precession. Gyroscopic inertia keeps the spinning gyro fixed in space so that, relative to space, it does not move. But the earth rotating underneath it gives it an apparent motion relative to the earth. This causes an apparent drift, or precession, which varies with latitude... Precession error, both mechanical and apparent, must be corrected for at regular intervals of about 15 minutes. 1, record 23, English, - precession%20error
Record 23, French
Record 23, Domaine(s)
- Mécanique générale (Physique)
- Pilotage et navigation aérienne
- Instruments de navigation
- Instruments et équipement de bord (Constructions aéronautiques)
Record 23, Main entry term, French
- erreur de précession
1, record 23, French, erreur%20de%20pr%C3%A9cession
correct, feminine noun
Record 23, Abbreviations, French
Record 23, Synonyms, French
Record 23, Textual support, French
Record number: 23, Textual support number: 1 CONT
Erreur de précession. Les forces de friction présentes dans le système gyroscopique engendrent la précession. Cette précession occasionne un «glissement» ou une «dérive» d'environ 3 degrés dans la lecture de l'instrument et ce, à toutes les 15 minutes. Le gyroscope est aussi sujet à la précession apparente. L'inertie gyroscopique garde le gyroscope fixe dans l'espace de sorte qu'il ne bouge pas par rapport à l'espace. Cependant, la terre qui tourne en dessous du gyroscope donne à ce dernier un mouvement apparent par rapport à la terre. La rotation de la terre cause une dérive apparente, ou précession, qui varie avec la latitude [...] L'erreur de précession, à la fois mécanique et apparente, doit être corrigée à intervalles réguliers, c.-à-d. toutes les 15 minutes. 2, record 23, French, - erreur%20de%20pr%C3%A9cession
Record 23, Spanish
Record 23, Textual support, Spanish
Record 24 - internal organization data 2001-06-22
Record 24, English
Record 24, Subject field(s)
- General Mechanics (Physics)
- Aircraft Piloting and Navigation
- Navigation Instruments
- Flight Instruments and Equipment (Aeroindustry)
Record 24, Main entry term, English
- precession re-adjustment
1, record 24, English, precession%20re%2Dadjustment
correct
Record 24, Abbreviations, English
Record 24, Synonyms, English
Record 24, Textual support, English
Record number: 24, Textual support number: 1 CONT
A significant advantage of the HI (heading indicator) over the magnetic compass is its steadiness in turbulence and various aircraft movements... the compass have several errors introduced during turns, acceleration and deceleration. The HI is unaffected by these maneuvers and by turbulence, and is a reliable instrument as long as the precession re-adjustment is made in timely fashion. 1, record 24, English, - precession%20re%2Dadjustment
Record number: 24, Textual support number: 1 OBS
Gyroscopic precession. The reaction of a gyro when a force is applied to the spinning wheel. When force is applied to a gyro, the device reacts as if the force had been applied at a point 90 degrees from the point of actual application, in the direction of rotation. Precession affects propellers, which act like gyros, and gyro instruments. Its principle effect is on the heading indicator, which tends to drift over time. 2, record 24, English, - precession%20re%2Dadjustment
Record 24, French
Record 24, Domaine(s)
- Mécanique générale (Physique)
- Pilotage et navigation aérienne
- Instruments de navigation
- Instruments et équipement de bord (Constructions aéronautiques)
Record 24, Main entry term, French
- correction de l'erreur de précession
1, record 24, French, correction%20de%20l%27erreur%20de%20pr%C3%A9cession
feminine noun
Record 24, Abbreviations, French
Record 24, Synonyms, French
Record 24, Textual support, French
Record number: 24, Textual support number: 1 OBS
Erreur de précession. Les forces de friction présentes dans le système gyroscopique engendrent la précession. Cette précession occasionne un «glissement» ou une «dérive» d'environ 3 degrés dans la lecture de l'instrument et ce, à toutes les 15 minutes. Le gyroscope est aussi sujet à la précession apparente. L'inertie gyroscopique garde le gyroscope fixe dans l'espace de sorte qu'il ne bouge pas par rapport à l'espace. Cependant, la terre qui tourne en dessous du gyroscope donne à ce dernier un mouvement apparent par rapport à la terre. La rotation de la terre cause une dérive apparente, ou précession, qui varie avec la latitude [...] L'erreur de précession, à la fois mécanique et apparente, doit être corrigée à intervalles réguliers, c.-à-d. toutes les 15 minutes. 2, record 24, French, - correction%20de%20l%27erreur%20de%20pr%C3%A9cession
Record 24, Key term(s)
- correction des erreurs de précession
- correction de la précession
Record 24, Spanish
Record 24, Textual support, Spanish
Record 25 - internal organization data 2001-06-22
Record 25, English
Record 25, Subject field(s)
- Flight Instruments and Equipment (Aeroindustry)
- Aircraft Piloting and Navigation
- Navigation Instruments
Record 25, Main entry term, English
- gyroscopic characteristic
1, record 25, English, gyroscopic%20characteristic
correct
Record 25, Abbreviations, English
Record 25, Synonyms, English
Record 25, Textual support, English
Record number: 25, Textual support number: 1 CONT
Any spinning object posesses gyroscopic characteristics. The central mechanism of the gyroscope is a wheel similar to a bicycle wheel. It's outer rim has a heavy mass. It rotates at high speed on very low friction bearings. When it is rotating normally, it resists changes in direction. The gyroscope exhibits two predominant characteristics. Rigidity in space. Precession. 2, record 25, English, - gyroscopic%20characteristic
Record number: 25, Textual support number: 2 CONT
The gyro has been applied as a controller in the steering systems of ships, planes, and torpedos. In these applications, the important gyroscopic characteristic being used is rigidity in space, i.e. the spinning gyroscope maintains it orientation in space. 3, record 25, English, - gyroscopic%20characteristic
Record 25, Key term(s)
- gyroscopic characteristics
Record 25, French
Record 25, Domaine(s)
- Instruments et équipement de bord (Constructions aéronautiques)
- Pilotage et navigation aérienne
- Instruments de navigation
Record 25, Main entry term, French
- propriété gyroscopique
1, record 25, French, propri%C3%A9t%C3%A9%20gyroscopique
correct, feminine noun
Record 25, Abbreviations, French
Record 25, Synonyms, French
Record 25, Textual support, French
Record number: 25, Textual support number: 1 CONT
De façon générale, les gyrovibrants sont des systèmes mécaniques dont certains modes de vibration présentent des propriétés de type gyroscopique. Dans le travail en cours, on s'intéresse plus particulièrement aux gyrovibrants dont le système mécanique sous-jacent est constitué par une coque mince. [...] Plus spécifiquement, les objectifs sont de 1.Mieux comprendre les phénomènes mécaniques qui sont à la base des propriétés gyroscopiques des gyrovibrants en général, et des coques résonnantes en particulier; [...] 2, record 25, French, - propri%C3%A9t%C3%A9%20gyroscopique
Record 25, Key term(s)
- propriétés gyroscopiques
Record 25, Spanish
Record 25, Textual support, Spanish
Record 26 - internal organization data 2001-06-21
Record 26, English
Record 26, Subject field(s)
- General Mechanics (Physics)
- Aircraft Piloting and Navigation
- Navigation Instruments
- Flight Instruments and Equipment (Aeroindustry)
Record 26, Main entry term, English
- gyroscopic output torque
1, record 26, English, gyroscopic%20output%20torque
correct
Record 26, Abbreviations, English
Record 26, Synonyms, English
- output torque of a gyroscope 2, record 26, English, output%20torque%20of%20a%20gyroscope
correct
Record 26, Textual support, English
Record number: 26, Textual support number: 1 CONT
Due to its gyroscopic action, the spin axis of the rotor(gyroscope) tends to remain nonrotating with respect to inertial space. From the previous consideration, it can be stated that the gyroscopic output torque is the reaction torque, which is developed by the angular velocity of precession of the angular momentum vector H, and opposes the applied torque. 1, record 26, English, - gyroscopic%20output%20torque
Record 26, French
Record 26, Domaine(s)
- Mécanique générale (Physique)
- Pilotage et navigation aérienne
- Instruments de navigation
- Instruments et équipement de bord (Constructions aéronautiques)
Record 26, Main entry term, French
- couple de sortie du gyroscope
1, record 26, French, couple%20de%20sortie%20du%20gyroscope
masculine noun
Record 26, Abbreviations, French
Record 26, Synonyms, French
- couple gyroscopique de sortie 1, record 26, French, couple%20gyroscopique%20de%20sortie
masculine noun
Record 26, Textual support, French
Record number: 26, Textual support number: 1 OBS
Couple gyroscopique. C'est [...] une conséquence de l'inertie du gyroscope : un gyroscope réagit par un couple chaque fois que l'on veut lui imposer une rotation suivant un axe différent de son axe de rotation propre. Ce couple s'appelle couple gyroscopique et tend en général à faire basculer l'axe du rotor. 2, record 26, French, - couple%20de%20sortie%20du%20gyroscope
Record 26, Spanish
Record 26, Textual support, Spanish
Record 27 - internal organization data 2001-06-21
Record 27, English
Record 27, Subject field(s)
- General Mechanics (Physics)
- Astrophysics and Cosmography
- Chemistry
- Aircraft Piloting and Navigation
Record 27, Main entry term, English
- precess
1, record 27, English, precess
correct, verb
Record 27, Abbreviations, English
Record 27, Synonyms, English
Record 27, Textual support, English
Record number: 27, Textual support number: 1 CONT
If the gyroscope were a perfect instrument, it would be possible to determine the position of a satellite or a space vehicle with respect to its own fixed axes. But a gyroscope precesses... A very good gyroscope only precesses a few thousandths of a degree of arc in an hour, but at the end of a week the error is about one degree and it is twenty-five degrees at the end of six months. 2, record 27, English, - precess
Record number: 27, Textual support number: 2 CONT
The HI [heading indicator] gyroscope may precess in small amounts over time. Therefore, the HI should be checked against the compass in 15 minute intervals. 3, record 27, English, - precess
Record number: 27, Textual support number: 1 OBS
Gyroscopic precession. The reaction of a gyro when a force is applied to the spinning wheel. When force is applied to a gyro, the device reacts as if the force had been applied at a point 90 degrees from the point of actual application, in the direction of rotation. Precession affects propellers, which act like gyros, and gyro instruments. Its principle effect is on the heading indicator, which tends to drift over time. 4, record 27, English, - precess
Record number: 27, Textual support number: 2 OBS
precession: A comparatively slow gyration of the rotation axis of a spinning body about another line intersecting it so as to describe a cone. 5, record 27, English, - precess
Record 27, French
Record 27, Domaine(s)
- Mécanique générale (Physique)
- Astrophysique et cosmographie
- Chimie
- Pilotage et navigation aérienne
Record 27, Main entry term, French
- précessionner
1, record 27, French, pr%C3%A9cessionner
correct, see observation
Record 27, Abbreviations, French
Record 27, Synonyms, French
- précesser 2, record 27, French, pr%C3%A9cesser
see observation
Record 27, Textual support, French
Record number: 27, Textual support number: 1 CONT
Comment pointer les gyros ?: [...] il suffit de commander les couples adéquats pour faire précessionner S2 en [phi] et [psi], jusqu'au bon alignement sur l'étoile choisie. 3, record 27, French, - pr%C3%A9cessionner
Record number: 27, Textual support number: 2 CONT
[...] une roue de vélo soutenue à une extrémité de son axe précessionne à l'horizontale. 4, record 27, French, - pr%C3%A9cessionner
Record number: 27, Textual support number: 3 CONT
Le proton va donc précesser en décrivant un cône parallèle ou antiparallèle selon son niveau d'énergie. 5, record 27, French, - pr%C3%A9cessionner
Record number: 27, Textual support number: 4 CONT
Dans un virage dérapé, le gyroscope «précesse» du côté du virage. Une fois l'avion revenu au vol rectiligne en palier, l'instrument indique un virage dans la direction du dérapage. Dans un virage normal, le gyroscope «précesse» du côté du virage. Le mécanisme de redressement du gyroscope corrige rapidement l'erreur de précession. 6, record 27, French, - pr%C3%A9cessionner
Record number: 27, Textual support number: 5 CONT
[...] on peut montrer en mécanique qu'un gyroscope soumis à un moment de force (par exemple, une toupie inclinée reposant sur sa pointe et soumise à son poids) précesse, c'est-à-dire que son axe de rotation décrit un cône en une période beaucoup plus longue que celle de sa rotation propre. 7, record 27, French, - pr%C3%A9cessionner
Record number: 27, Textual support number: 1 OBS
précession : Mécanique physique. Mouvement conique décrit, autour d'une position moyenne, par l'axe de rotation propre d'un corps animé d'un mouvement gyroscopique. 8, record 27, French, - pr%C3%A9cessionner
Record number: 27, Textual support number: 2 OBS
précesser; précessionner : À ce jour (2000), les deux termes ne sont pas répertoriés dans les dictionnaires courants; cependant, les deux formes sont largement attestées dans les textes les plus pointus sur Internet, avec un léger avantage pour «précesser». L'usage ne semble pas avoir tranché en faveur de l'un ou de l'autre. On pourrait penser cependant que la forme «précessionner» est plus conforme aux principes de création par dérivation en français. 9, record 27, French, - pr%C3%A9cessionner
Record 27, Spanish
Record 27, Textual support, Spanish
Record 28 - internal organization data 2001-06-21
Record 28, English
Record 28, Subject field(s)
- General Mechanics (Physics)
- Aircraft Piloting and Navigation
- Navigation Instruments
- Flight Instruments and Equipment (Aeroindustry)
Record 28, Main entry term, English
- gyroscopic principle
1, record 28, English, gyroscopic%20principle
correct
Record 28, Abbreviations, English
Record 28, Synonyms, English
Record 28, Textual support, English
Record number: 28, Textual support number: 1 CONT
Gyroscopic principles. Any spinning object possesses gyroscopic characteristics. The central mechanism of the gyroscope is a wheel similar to a bicycle wheel. It's outer rim has a heavy mass. It rotates at high speed on very low friction bearings. When it is rotating normally, it resists changes in direction. The gyroscope exhibits two predominant characteristics. Rigidity in space. Precession. 2, record 28, English, - gyroscopic%20principle
Record number: 28, Textual support number: 2 CONT
Hands-on experience with gyroscopes is a good way to help children understand rotational motion. Have students experiment with spinning tops on a large, hard, flat surface such as the gymnasium floor. The students should set the tops spinning and make observations about what happens when they push the spinning tops in certain directions. They can try applying force to the gyroscopes at different heights from the ground to see how this affects the movement of a spinning top. All this can be related to gyroscopic principles(such as precession and gyroscopic inertia), as well as applications of these principles(satellites, bicycles, etc.) in real life. 3, record 28, English, - gyroscopic%20principle
Record 28, French
Record 28, Domaine(s)
- Mécanique générale (Physique)
- Pilotage et navigation aérienne
- Instruments de navigation
- Instruments et équipement de bord (Constructions aéronautiques)
Record 28, Main entry term, French
- principe gyroscopique
1, record 28, French, principe%20gyroscopique
correct, masculine noun
Record 28, Abbreviations, French
Record 28, Synonyms, French
Record 28, Textual support, French
Record number: 28, Textual support number: 1 CONT
Les expériences pratiques avec les gyroscopes constituent un bon moyen d'aider les élèves à comprendre le mouvement de rotation. Demander aux élèves de faire tourner des toupies sur une surface vaste, dure et plane comme le plancher du gymnase. Les élèves doivent faire tourner les toupies et observer ce qui se passe quand ils (elles) les poussent dans certaines directions. Ils peuvent essayer d'appliquer de la force aux toupies placées à différentes hauteurs du sol, afin de voir l'effet que cela produit sur leur mouvement. Tout cela peut être relié aux principes gyroscopiques (comme la précession et inertie gyroscopique), ainsi qu'à leurs applications dans la vie courante (satellites, bicyclettes, etc.). 2, record 28, French, - principe%20gyroscopique
Record 28, Spanish
Record 28, Textual support, Spanish
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