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HARMONIC MOTION [16 records]

Record 1 2017-11-20

English

Subject field(s)
  • Acoustics (Physics)
CONT

In a system undergoing vibration, a mode of vibration designates the characteristic pattern of nodes and antinodes assumed by the system in which the motion of every particle, for a particular frequency, is simple harmonic(for linear systems) or has corresponding decay patterns.

OBS

Two or more modes may exist concurrently in a multi-degree-of-freedom system.

French

Domaine(s)
  • Acoustique (Physique)
CONT

Dans un système en vibration, un mode de vibration indique la disposition caractéristique des nœuds et des ventres accusée par le système lorsque les mouvements de chacune de ses parties élémentaires, pour une fréquence donnée, sont harmoniques (cas des systèmes linéaires) ou présentent des types de décroissance correspondants.

CONT

Dans un système à plusieurs degrés de liberté, il peut exister simultanément deux ou plusieurs modes de vibration.

Spanish

Save record 1

Record 2 2016-02-25

English

Subject field(s)
  • Mathematics
OBS

The term harmonic motion(without the qualifier "simple") is used to describe rotary and other motions in which some variable, such as an angular displacement, varies sinusoidally with time.

French

Domaine(s)
  • Mathématiques

Spanish

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Record 3 2015-09-04

English

Subject field(s)
  • Acoustics (Physics)
  • Audio Technology
  • Air Transport
DEF

A sound in which the sound pressure varies sinusoidally with time.

CONT

Few sounds in daily experience are pure tones characterized by a single frequency ...

CONT

If a loudspeaker cone is made to vibrate with simple harmonic motion at a given frequency,... it gives rise to a sinusoidal disturbance in the atmosphere. This sound is known as a pure tone. Examples of noise sources which contain pure tones include fans, engine exhausts, pumps, compressors, gears, bearings and electric motors.

OBS

pure tone: term standardized by the CSA. Material reproduced with the permission of the copyright holder, the Canadian Standards Association (CSA), 178 Rexdale Blvd., Toronto, Ontario, Canada M9W 1R3. However, CSA shall not be responsible for the manner in which the information is presented, nor for any interpretations thereof. This CSA material may not have been updated to reflect amendments subsequently made to the original content. For further information, contact CSA.

OBS

pure tone: term officially approved by the International Civil Aviation Organization (ICAO).

French

Domaine(s)
  • Acoustique (Physique)
  • Électroacoustique
  • Transport aérien
DEF

Son correspondant à une seule vibration acoustique sinusoïdale. [Définition normalisée par l'AFNOR et reproduite avec son autorisation.]

CONT

Si la variation de pression est une fonction sinusoïdale du temps, on est en présence d'un son pur.

OBS

On dit qu'un son est pur lorsque l'oscillation des particules se fait suivant une sinusoïde pure, c'est-à-dire lorsqu'elle peut être représentée en totalité en un point en fonction du temps par une sinusoïde [...]

OBS

son pur : terme normalisé par l'AFNOR et uniformisé par l'Organisation de l'aviation civile internationale (OACI).

Spanish

Campo(s) temático(s)
  • Acústica (Física)
  • Electroacústica
  • Transporte aéreo
DEF

Oscilación acústica sinusoidal.

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Record 4 2015-07-10

English

Subject field(s)
  • General Mechanics (Physics)
  • Plant Biology
DEF

... a measure of how much a structure resists motion when subjected to a harmonic force.

CONT

Root elongation in drying soil is generally limited by a combination of mechanical impedance and water stress.

French

Domaine(s)
  • Mécanique générale (Physique)
  • Biologie végétale
DEF

[...] mesure de la résistance opposée à un mouvement par une structure soumise à une force donnée.

Spanish

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Record 5 2011-08-17

English

Subject field(s)
  • Analytical Functions (Math.)
  • Surveying
  • Mathematical Geography
DEF

Any solution of the Laplace equation which has continuous derivatives of first and second order.

CONT

... it is quite natural to look at GSPD as a fractal measure ... with infinitely many types of singularities. Probing the surface with many random walks is equivalent to the estimation of the corresponding solutions of Laplace’s equation ... which are usually called harmonic functions. Consequently, the name harmonic measure is also used for GSPD.

OBS

To calculate the harmonic measure and its characteristic properties one can follow two numerical methods. i) After having generated a DLA cluster one releases further particles... whose diffusional motion is simulated by the same technique... which is used for growing the aggregate. These probe particles, however, are eliminated when they arrive at the surface, and a record is kept of how many times each of the surface sites is contacted in this way. The normalized number of contacts is then regarded as the growth probability.

French

Domaine(s)
  • Fonctions mathématiques analytiques
  • Arpentage
  • Géographie mathématique
DEF

Fonction formée par quatre points d'une droite, d'un faisceau de droites, d'une moyenne, etc.

Spanish

Save record 5

Record 6 2010-12-02

English

Subject field(s)
  • Mechanics
DEF

In a mechanical sense, the complex ratio of the force to velocity taken at the same point in a mechanical system during simple harmonic motion.

Key term(s)
  • driving point impedance

French

Domaine(s)
  • Mécanique
DEF

En mécanique, rapport complexe de la force à la vitesse mesurée au même point dans un système mécanique animé d'un mouvement harmonique simple.

Spanish

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Record 7 2005-02-16

English

Subject field(s)
  • Energy (Physics)
OBS

decrement : The ratio of the amplitudes of an underdamped harmonic motion during two successive oscillations. Also known as damping factor; numerical decrement.

French

Domaine(s)
  • Énergie (Physique)
OBS

décrément : Rapport de deux amplitudes maximales successives d'un système oscillatoire amorti.

Spanish

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Record 8 2000-08-29

English

Subject field(s)
  • Mathematics
  • Computer Graphics
CONT

To calculate the harmonic measure and its characteristic properties one can follow two numerical methods. i) After having generated a DLA cluster one releases further particles... whose diffusional motion is simulated by the same technique... which is used for growing the aggregate.... ii) solving the Laplace equation... with boundary conditions.... For small clusters the Green's function method can be used to solve Laplace's equation... yielding GSPD free of any effects....

Key term(s)
  • Green method

French

Domaine(s)
  • Mathématiques
  • Infographie
DEF

Méthode de simulation numérique de la croissance d'un agrégat limité par diffusion, par résolution d'équations laplaciennes.

Spanish

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Record 9 1993-10-06

English

Subject field(s)
  • Acoustics (Physics)
DEF

The complex ratio of the velocity, taken at one point in a mechanical system, to the force, taken at another point in the same system, during simple harmonic motion.

OBS

Transfer mobility is the frequency-response function formed by the ratio, in metres per newton second, of the velocity-response phasor at point i to the excitation forces phasor applied at point j with all points other than j allowed to respond freely without any constraints other than those constraints which represent the normal support of the structure in its intended application.

French

Domaine(s)
  • Acoustique (Physique)
DEF

Rapport complexe de la vitesse prise en un point d'un système mécanique à la force mesurée en un autre point dans le même système pendant un mouvement harmonique simple.

OBS

La mobilité de transfert est la fonction de réponse en fréquence constituée par le rapport, exprimé en mètre par newton seconde, du vecteur tournant de la réponse en vitesse au point i, au vecteur tournant de la force d'excitation appliquée au point j, tous les points autres que j pouvant répondre librement sans autre contrainte que celle que représente le support normal de la structure dans l'application prévue par cette structure.

Spanish

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Record 10 1993-10-06

English

Subject field(s)
  • Acoustics (Physics)
DEF

The complex ratio of force to acceleration during simple harmonic motion.

OBS

The ratio of force to acceleration, when the acceleration is given in terms of g, is sometimes called effective weight or effective load.

French

Domaine(s)
  • Acoustique (Physique)
DEF

Rapport complexe de la force à l'accélération pour un mouvement harmonique.

OBS

Lorsque l'accélération est donnée en nombre de g, le rapport de la force à l'accélération est appelé masse effective ou charge effective.

Spanish

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Record 11 1993-10-06

English

Subject field(s)
  • Acoustics (Physics)
OBS

The ratio of change of force to change of displacement under dynamic conditions. The complex ratio of force to displacement during simple harmonic motion.

French

Domaine(s)
  • Acoustique (Physique)
OBS

Rapport de la variation de force à la variation de déplacement dans des conditions dynamiques. Rapport complexe de la force au déplacement dans un mouvement harmonique.

Spanish

Save record 11

Record 12 1993-10-05

English

Subject field(s)
  • Acoustics (Physics)
DEF

The complex ratio of the velocity, taken at a point in a mechanical system, to the force, taken at the same or another point in the system, during simple harmonic motion.

OBS

Mechanical mobility is the inverse of mechanical impedance.

French

Domaine(s)
  • Acoustique (Physique)
DEF

Rapport complexe de la vitesse, mesurée en un point d'un système mécanique, à la force mesurée en ce même point ou en un autre point du système pendant un mouvement harmonique simple.

Spanish

Save record 12

Record 13 1993-10-05

English

Subject field(s)
  • Acoustics (Physics)
DEF

The complex ratio of velocity and force taken at the same point in a mechanical system during simple harmonic motion.

French

Domaine(s)
  • Acoustique (Physique)
DEF

Rapport complexe d'une vitesse et d'une force mesurées au même point dans un système mécanique pendant un mouvement harmonique simple.

Spanish

Save record 13

Record 14 1988-10-31

English

Subject field(s)
  • Transformation of Momentum (Mechanical Components)
DEF

Mechanism used to change reciprocating motion into rotary motion or vice-versa. Used to connect crankshaft to piston in refrigeration compressor.

DEF

A type of four-bar linkage; it is employed to convert a steady rotation into a simple harmonic motion.

French

Domaine(s)
  • Transformations de mouvements (Composants mécaniques)
OBS

Excentrique : Mécanisme destiné à transformer le mouvement de rotation d'une pièce en un mouvement alternatif, par l'intermédiaire d'une autre pièce guidée par la première.

Spanish

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Record 15 1980-03-13

English

Subject field(s)
  • General Mechanics (Physics)
  • Mechanics
CONT

[A torsional pendulum is a] device consisting of a disk or other large moment of inertia mounted on one end of a torsionally flexible elastic rod whose other end is held fixed; if the disk is twisted and released, it will undergo simple harmonic motion, provided the torque in the rod is proportional to the angle of twist.

Key term(s)
  • tortionally flexible

French

Domaine(s)
  • Mécanique générale (Physique)
  • Mécanique
DEF

Pouvant subir une torsion.

CONT

Le rotor anti-couple: simple lame torsible et flexible en matériau composite, et de nombreux accessoires empruntés à la grande série (industries automobile et connexes).

Spanish

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Record 16 1975-03-11

English

Subject field(s)
  • Music (General)
  • Acoustics (Physics)
CONT

Simple harmonic motion [is] the regular to-and-fro oscillations which in certain circumstances can be closely approached by the movement of the blade of a tuning fork.

French

Domaine(s)
  • Musique (Généralités)
  • Acoustique (Physique)
CONT

[...] la vitesse de la branche du diapason en mouvement qui produit le son augmente, passe par un maximum, décroît, change de sens et recommence à un rythme constant.

Spanish

Save record 16

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