Vibration analysis is the study of the movement of sway of a machinery or structure, in any direction of the space, from its balance position. This study consists on two stages: acquisition of data and interpretation of the data obtained starting from the measurement of the vibrations. The end of this technique is to be able to determine the mechanical conditions of the object to study and to detect specific or functional possible shortcomings. To obtain this data an vibrations analyzer it is used, which transforms electric signals coming from a transducer (usually an accelerometer) into graphic images for their later analysis.

Some flaws that they can be detected they are:

	Balance of rotating elements.
	Misalignment in joinings.
	Worn away engagements or damaged.
	Deteriorated bearings.
	Excessive or inadequate tighten.
	Electric problems.