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This article is from the Acoustics FAQ, by Andrew Silverman with numerous contributions by others.

3.1 What is vibration ?

When something oscillates about a static position it can be said to vibrate. The vibration of a speaker diaphragm produces sound, but usually vibration is undesirable. Common examples of unwanted vibration are the movement of a building near a railway line when a train passes, or the vibration of the floor caused by a washing machine or spin dryer. Floor vibration can be reduced with vibration isolators; however there is often a penalty to pay in the form of a slight increase in the machinery vibration and its consequent deterioration.

 

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physics, acoustics