Answer:
a regular periodic variation in value about a mean
a vibration is a movement up and down or side to side
 

A majority of equipments generate vibration being rotating machines need vibration analysis on regular basis to predict the health of equipments and fault diagnosis. A maintenance engineer shall develop Predictive Maintenance Program using Vibration Analysis concept.

 

Article for Vibration analysis and remedy: click here

http://www.brighthub.com/engineering/electrical/articles/122952.aspx  

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