TERMIUM Plus^®

Fiche 1,  Justifications,  Anglais

Record number: 1, Textual support number: 1 CONT

By drawing an analogy between linear and rotational dynamics, an equation describing the viscous torque acting on an object rotating in a fluid can be anticipated. Stokes’ and Newton's models of a viscous drag force are commonly used to describe the damping force acting on an object moving linearly through a fluid. This experiment demonstrates that these models can be extended to describe the viscous torque that damps the rotation of an object in a fluid. When the rotating object is round, the fluid flow is laminar; hence, the viscous torque is proportional to the angular velocity to the first power, analogous to Stokes’ model. However, when the rotating object is rough, causing the fluid flow to be turbulent, the viscous torque is proportional to the angular velocity to the second power, analogous to Newton's model. In addition, this experiment demonstrates that the proportionality constant between viscous torque and angular velocity is dependent on the shape of the object, as is the case in both Stokes’ and Newton's models.  1, fiche 1, Anglais, - viscous%20torque

Fiche 1,  Justifications,  Français

Record number: 1, Textual support number: 1 CONT

Les gyroscopes 1 axe sont essentiellement constitués : d'une toupie [...]; d'un élément de cardan (anneau ou carter) reliant [delta] au boîtier de l'appareil, par l'intermédiaire de l'axe de sortie [...]; d'un détecteur d'écart [...]; d'un moteur-couple [...]. De plus, ils comportent éventuellement : un liquide amortisseur dans lequel baigne un carter étanche contenant la toupie; il en résulte l'application à ce carter d'un couple «visqueux» [...] étant un coefficient constant; en outre, la flottaison ainsi obtenue permet de soulager la liaison boîtier-carter, qui peut alors être constituée par des ensembles pivot-rubis; [...]  2, fiche 1, Français, - couple%20visqueux

Fiche 1,  Justifications,  Espagnol

Fiche 2,  Justifications,  Anglais

Record number: 2, Textual support number: 1 CONT

The rate gyroscopes are not spring-restrained. Instead, "floatation gyroscopes" in which the precession is opposed by the viscous drag of a liquid are employed. The opposing torque is therefore proportional to the precession rate, instead of the precession displacement, as in a spring-restrained gyroscope.  1, fiche 2, Anglais, - spring%2Drestrained%20gyroscope

Record number: 2, Textual support number: 2 CONT

IEEE Test Procedure for Single-Degree-of-Freedom Spring-Restrained Gyros.  2, fiche 2, Anglais, - spring%2Drestrained%20gyroscope

Fiche 2,  Justifications,  Français

Fiche 2,  Justifications,  Espagnol

Fiche 3,  Justifications,  Anglais

Record number: 3, Textual support number: 1 DEF

A viscometer which consists of a spindle rotated in a container of a sample liquid. The principle involved is that the viscosity is directly proportional to the torque required to drive the spindle.  1, fiche 3, Anglais, - rotating%20spindle%20apparatus%20for%20measuring%20viscosity

Record number: 3, Textual support number: 1 CONT

The principle of the rotation type viscosity measuring element or the rotational spindle type viscosity measuring element is that viscosity of a fluid is directly proportional to the torque produced by the resistance to shearing stress on a spindle rotating in a fluid.  2, fiche 3, Anglais, - rotating%20spindle%20apparatus%20for%20measuring%20viscosity

Record number: 3, Textual support number: 2 CONT

In the torque viscometer, a sensor (spindle) is rotated at some speed through the same couple arrangement which allows the sensor to be displaced to an equilibrium position at which point the calibrated torque spring gives a reference to the viscosity of the fluid being measured. Different types of spindles and speeds may be used.  3, fiche 3, Anglais, - rotating%20spindle%20apparatus%20for%20measuring%20viscosity

Record number: 3, Textual support number: 3 CONT

The rotating-vane-type viscosity measuring element depends upon the drag on a rotating member in contact with the material whose viscosity is to be measured. The vane or rotating element is driven by a synchronous electrical motor. The torque required to rotate the member of the vane is measured and is proportional to the viscosity in contact with the rotating element. The synchronous motor drives the cage at a constant speed. The upper spindle arm is coupled to the cage through a calibrated beryllium-copper spring. During measurement, the spring is wound up until its force exactly equals the viscous drag on the spindle; then the cage and spindle continue to operate at the same speed, but with a definite angular relationship to each other proportional to the torque on the spring.  4, fiche 3, Anglais, - rotating%20spindle%20apparatus%20for%20measuring%20viscosity

Fiche 3,  Justifications,  Français

Record number: 3, Textual support number: 1 DEF

Viscosimètre dont le dispositif tournant est entraîné à vitesse constante par un moteur synchrone, et l'on mesure le couple nécessaire à cette rotation en reliant par un ressort le moteur et l'arbre sur lequel est monté le dispositif. La torsion du ressort, c'est-à-dire le déphasage (ou le décalage) entre le moteur et l'arbre est une mesure du couple, donc de la viscosité.  1, fiche 3, Français, - viscosim%C3%A8tre%20rotatif

Record number: 3, Textual support number: 1 CONT

Le principe du viscosimètre rotatif ou du viscosimètre à corps tournant est qu'un objet qui tourne dans un liquide subit une force de ralentissement due à la viscosité du liquide. Il s'agit généralement d'un cylindre aux extrémités coniques, l'ensemble du dispositif ayant la forme d'un fuseau. On emploie aussi des disques et des roues à aubes.  1, fiche 3, Français, - viscosim%C3%A8tre%20rotatif

Fiche 3,  Justifications,  Espagnol

Fiche 4,  Justifications,  Français

Fiche 4,  Justifications,  Espagnol

Fiche 5,  Justifications,  Anglais

Record number: 5, Textual support number: 1 OBS

[Two viscous dampers] serve as a fail-safe provision to inhibit surface oscillation if a failure in the booster drive rod, torque arm or input bellcrank occurs.  1, fiche 5, Anglais, - torque%20arm

Fiche 5,  Justifications,  Français

Fiche 5,  Justifications,  Espagnol