Where does it come from?
In practice it is very difficult to avoid vibration. It usually
occurs because of the dynamic effects of manufacturing
tolerances, clearances, rolling and rubbing contact between machine parts and out-of-balance forces in rotating and reciprocating members. Often, small insignificant vibrations can excite the resonant frequencies of
some other structural parts and be amplified into major
vibration and noise sources.
Sometimes though, mechanical vibration performs a useful job. For example, we generate vibration intentionally
in component feeders, concrete compactors, ultrasonic
cleaning baths, rock drills and pile drivers. Vibration testing machines are used extensively to impart a controlled
level of vibration energy to products and sub-assemblies
where it is required to examine their physical or functional response and ascertain their resistability to vibration environments.
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