Dictionary Definition
vibrating adj : moving very rapidly to and fro or
up and down; "the vibrating piano strings" [syn: vibratory]
User Contributed Dictionary
English
Pronunciation

 Rhymes: eɪtɪŋ
Verb
vibrating present participle of vibrate
Extensive Definition
 ''For other uses, see oscillator (disambiguation)
Simplicity
The simplest mechanical oscillating system is a
mass attached to a linear spring,
subject to no other forces; except for the point of equilibrium,
this system is equivalent to the same one subject to a constant
force such as gravity. Such a system may be
approximated on an air table or ice surface. The system is in an
equilibrium
state when the spring is unstretched. If the system is displaced
from the equilibrium, there is a net restoring force on the mass,
tending to bring it back to equilibrium. However, in moving the
mass back to the equilibrium position, it has acquired momentum which keeps it moving
beyond that position, establishing a new restoring force in the
opposite sense. The time taken for an oscillation to occur is often
referred to as the oscillatory period.
The specific dynamics
of this springmass system are described mathematically by the
simple harmonic oscillator and the regular periodic
motion is known as simple
harmonic motion. In the springmass system, oscillations occur
because, at the static
equilibrium displacement, the mass has kinetic
energy which is converted into potential
energy stored in the spring at the extremes of its path. The
springmass system illustrates some common features of oscillation,
namely the existence of an equilibrium and the presence of a
restoring force which grows stronger the further the system
deviates from equilibrium.
The harmonic
oscillator offers a model of many more complicated types of
oscillation and can be extended by the use of Fourier
analysis.
Damped, driven and selfinduced oscillations
In realworld systems, the
second law of thermodynamics dictates that there is some
continual and inevitable conversion of energy into the thermal
energy of the environment. Thus, damped oscillations tend to
decay with time unless there is some net source of energy in the
system. The simplest description of this decay process can be
illustrated by the harmonic oscillator. In addition, an oscillating
system may be subject to some external force (often sinusoidal), as when an AC
circuit
is connected to an outside power source. In this case the
oscillation is said to be driven.
Some systems can be excited by energy transfer
from the environment. This transfer typically occurs where systems
are embedded in some fluid
flow. For example, the phenomenon of flutter in aerodynamics occurs when an
arbitrarily small displacement of an aircraft wing (from its equilibrium) results
in an increase in the angle of
attack of the wing on the air
flow and a consequential increase in lift
coefficient, leading to a still greater displacement. At
sufficiently large displacements, the stiffness of the wing
dominates to provide the restoring force that enables an
oscillation.
Coupled oscillations
The harmonic oscillator and the systems it models
have a single
degree of freedom. More complicated systems have more degrees
of freedom, for example two masses and three springs (each mass
being attached to fixed points and to each other). In such cases,
the behavior of each variable influences that of the others. This
leads to a coupling of the oscillations of the individual degrees
of freedom. For example, two pendulum clocks mounted on a common
wall will tend to synchronise. The apparent motions of the
individual oscillations typically appears very complicated but a
more economic, computationally simpler and conceptually deeper
description is given by resolving the motion into normal
modes.
Continuous systems  waves
As the number of degrees of freedom becomes
arbitrarily large, a system approaches continuity; examples include a
string or the surface of a body of water. Such systems have (in the
classical
limit) an infinite
number of normal modes and their oscillations occur in the form of
waves that can
characteristically propagate.
Examples
See also: list
of wave topics
Mechanical
 Double pendulum
 Quantum harmonic oscillator
 Foucault pendulum
 Helmholtz resonator
 Playground swing
 String instruments
 Tuning fork
 Vibrating string
 Oscillations in the Sun (helioseismology) and stars (asteroseismology)
Electrical
 Alternating current
 Armstrong oscillator
 Astable multivibrator
 Blocking oscillator
 Clapp oscillator
 Colpitts oscillator
 Delay line oscillator
 Electronic oscillator
 Hartley oscillator
 Oscillistor
 Pierce oscillator
 Relaxation oscillator
 RLC circuit
 Royer oscillator
 Vačkář oscillator
 Wien bridge oscillator
 Oscillators and Multivibrators
 Virtual Cathode Oscillator
Electromechanical
Optical
 Laser (oscillation of electromagnetic field with frequency of order 10^Hz)
 Oscillator Toda or selfpulsation (pulsation of output power of laser at frequencies 10^Hz  10^Hz in the transient regime)
 Quantum oscillator may refer to an optical local oscillator, as well as to a usual model in quantum optics.
Economic and social
 Business cycle
 Generation gap
 Malthusian economics
 News cycle
Climate and geophysics
See also
 BIBO stability
 Critical speed
 Dynamical system
 Feedback
 How do We Create Sinusoidal Oscillations? from Circuit Idea reveals the philosophy of LC oscillations
 Oscillation (mathematics)
 Periodic function
 Reciprocation
 Rhythm
 Self oscillation
 Signal generator
 Strange attractor
 Structural stability
 Time period
 Tuned mass damper
 Vibration
 Vibrator
External links
 Vibrations  a chapter from an online textbook
 Dealing Vibration at work
vibrating in Bosnian: Oscilovanje
vibrating in Catalan: Oscil·lació
vibrating in Czech: Kmitání
vibrating in Danish: Oscillator
vibrating in German: Schwingung
vibrating in Estonian: Võnkumine
vibrating in Modern Greek (1453):
Ταλάντωση
vibrating in Spanish: Oscilación
vibrating in Persian: نوسان
vibrating in French: Oscillation
vibrating in Korean: 진동
vibrating in Croatian: Titranje
vibrating in Ido: Ocilo
vibrating in Indonesian: Osilasi
vibrating in Italian: Oscillazione
vibrating in Hebrew: תנודה
vibrating in Latvian: Svārstības
vibrating in Malay (macrolanguage): Ayunan
vibrating in Dutch: Trilling
vibrating in Japanese: 振動 (物理現象)
vibrating in Norwegian: Oscillasjon
vibrating in Polish: Drgania
vibrating in Portuguese: Vibração
vibrating in Romanian: Oscilaţie
vibrating in Russian: Колебания
vibrating in Russian: Виброизоляция
vibrating in Simple English: Oscillator
vibrating in Slovak: Vibrácia
vibrating in Finnish: Oskillaattori
vibrating in Swedish: Oscillation
vibrating in Vietnamese: Dao động
vibrating in Ukrainian: Коливання
vibrating in Chinese: 振动
Synonyms, Antonyms and Related Words
aspen,
ceaseless, chattering, constant, continual, fluctuant, fluctuating, fluctuational, full, harmonic, incessant, libratory, machine gun,
mellow, nutational, oscillating, oscillatory, palsied, pendular, pendulous, perennial, periodic, perpetual, plangent, pulsating, pulsing, quaking, quavering, quavery, quivering, quivery, rapid, regular, repeated, resonant, resonating, rich, rolling, shaking, shaky, shivering, shivery, shuddering, sonorous, staccato, steady, stuttering, succussatory, succussive, sustained, throbbing, trembling, trembly, tremulous, unbroken, unceasing, unchanging, unintermitted, unintermittent, unintermitting, uninterrupted, unremitting, unstopped, unvarying, vacillating, vacillatory, vibrant, vibratile, vibratory, wavering, wobbly