Such vibrations could be caused by imbalances in the rotating parts, uneven friction, or the meshing of gear teeth. For example, the vibrational motions of engines, electric motors, or any mechanical device in operation are typically unwanted. In many cases, however, vibration is undesirable, wasting energy and creating unwanted sound. Vibration can be desirable: for example, the motion of a tuning fork, the reed in a woodwind instrument or harmonica, a mobile phone, or the cone of a loudspeaker. the movement of a tire on a gravel road). the periodic motion of a pendulum), or random if the oscillations can only be analysed statistically (e.g. Vibration may be deterministic if the oscillations can be characterised precisely (e.g. Vibration (from Latin vibrÅ 'to shake') is a mechanical phenomenon whereby oscillations occur about an equilibrium point.
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