TERMIUM Plus^®

Fiche 1,  Justifications,  Anglais

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The true local solar time of the descending node varies by up to 15 minutes around this value due to the eccentricity of the earth's orbit around the sun, which induces an uneven angular velocity around the sun, while the orbital precession rate is constant.  3, fiche 1, Anglais, - local%20solar%20time%20of%20the%20descending%20node

Fiche 1,  Justifications,  Français

Fiche 1,  Justifications,  Espagnol

Fiche 2,  Justifications,  Anglais

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Euler’s equations : A set of three differential equations expressing relations between the force moments, angular velocities, and angular accelerations of a rotating rigid body.  2, fiche 2, Anglais, - Euler%27s%20equation

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Forced Precession. Consider now what happens when a rotating symmetric body is subjected to a torque. It is clear from Euler's equation that when the applied torque is parallel to the angular momentum, the body experiences an angular acceleration which changes the magnitude of the angular velocity but not its direction. However, that is where the analogy to the translational case ends. Strange as it may seem, the equation implies that the response of the rotor to a torque applied normal to the spin axis is to rotate in a direction normal to both the spin axis and the applied torque. This phenomenon is also called precession.  3, fiche 2, Anglais, - Euler%27s%20equation

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Terms usually used in the plural.  4, fiche 2, Anglais, - Euler%27s%20equation

Fiche 2,  Justifications,  Français

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Mécanique classique I. Objectifs du cours. Introduire l'étudiante, l'étudiant aux concepts fondamentaux de la physique. Le cours porte particulièrement sur la mécanique de Newton et le Lagrange. [...] Dynamique des corps rigides. 1. Introduction. 2. Moment d'inertie. 3. Moment cinétique. 4. Les axes principaux d'inertie. 5. Angles d'Euler. 6. Équations d'Euler. 7. La toupie symétrique. 8. Applications.  2, fiche 2, Français, - %C3%A9quation%20d%27Euler

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Terme habituellement utilisé au pluriel.  3, fiche 2, Français, - %C3%A9quation%20d%27Euler

Fiche 2,  Justifications,  Espagnol

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Ecuaciones dinámicas generales del movimiento de un sólido rígido.  1, fiche 2, Espagnol, - ecuaciones%20de%20Euler

Fiche 3,  Justifications,  Anglais

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A rapidly spinning top will precess in a direction determined by the torque exerted by its weight. The precession angular velocity is inversely proportional to the spin angular velocity, so that the precession is faster and more pronounced as the top slows down.  2, fiche 3, Anglais, - precession%20angular%20velocity

Fiche 3,  Justifications,  Français

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Rôle du couple gyroscopique : Conformément à la théorie du gyroscope, quand on impose un couple (modéré) d'axe non colinéaire à l'axe de la rotation gyro, le gyro «réagit» en s'imposant une vitesse angulaire de précession telle que le couple gyroscopique créé annule celui imposé.  2, fiche 3, Français, - vitesse%20angulaire%20de%20pr%C3%A9cession

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Équations de la gyroscopie [...] On appelle force spécifique la différence entre l'accélération d'un véhicule et celle du champ de gravitation. [...] il suffit de mesurer avec un tachymètre la vitesse angulaire de précession pour connaître la composante Z1 de la force spécifique.  3, fiche 3, Français, - vitesse%20angulaire%20de%20pr%C3%A9cession

Fiche 3,  Justifications,  Espagnol

Fiche 4,  Justifications,  Anglais

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... special gyro configurations can be devised by using slow spin velocity for which sizable circular motions are easily induced and observed. When they are superimposed on steady precession(due to unbalance) the result is a nodding up an down of the axle as it precesses about the vertical, which has led to the term nutation.  2, fiche 4, Anglais, - steady%20precession

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The gyro in the artificial horizon can be set in motion and kept in constant motion (steady precession) by using either electricity to power a spinning motor or by using air with a vacuum to suck air out of the casing and vary this air in and out to keep the wheel turning constantly.  3, fiche 4, Anglais, - steady%20precession

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The three elementary movements of a gyroscope: ...1. Rotation--the top is spinning rapidly about its vertical axis. 2. Precession--as it slows down, the top cants over and its axis follows a conical path. 3. Nutation--as the top spins more slowly still, the axis oscillates in a sinusoidal path.  4, fiche 4, Anglais, - steady%20precession

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To keep in steady precession.  3, fiche 4, Anglais, - steady%20precession

Fiche 4,  Justifications,  Français

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Mouvement de précession stable d'un gyroscope.  2, fiche 4, Français, - pr%C3%A9cession%20stable

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Être en état de précession stable.  1, fiche 4, Français, - pr%C3%A9cession%20stable

Fiche 4,  Justifications,  Espagnol

Fiche 5,  Justifications,  Anglais

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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, fiche 5, Anglais, - gyroscopic%20output%20torque

Fiche 5,  Justifications,  Français

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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, fiche 5, Français, - couple%20de%20sortie%20du%20gyroscope

Fiche 5,  Justifications,  Espagnol