Vibration:
A back and forth motion about an equilibrium position.
Vibration is occasionally "desirable". For example the motion of a tuning fork or the cone of a loudspeaker is desirable vibration, necessary for the correct functioning of the various devices.
More often, vibration is undesirable, wasting energy and creating unwanted sounds. For example, the vibration motions of engines or any mechanical device in operation are typically unwanted. Such vibrations can be caused by imbalances in the rotating parts, uneven friction, the meshing of gear teeth, etc. Careful designs usually minimize unwanted vibrations.
Types of vibration:
Free Vibration:
It occurs when a mechanical system is set off with an initial input and then allowed to vibrate freely.
Forced vibration:
It occurs when an alternating force or motion is applied to a mechanical system.
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