what is the name given to sound produced by irregular vibrations?

Sound is produced when an object vibrates or moves to and fro repeatedly at regular intervals. Noises are produced by irregular vibrations, that occurs at irregular intervals. 
The sound of frequencies lower than 20 Hz cannot be heard by human beings. A vibrating simple pendulum produces sound but we cannot hear the sound of a vibrating simple pendulum because it vibrates with a frequency less than 20 Hz.

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what does a vibrating simple pendulum not produce any sound?

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what factors decide the frequency of vibration of a plunked string ?

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