Page 22 - Vibrations-2

This will create a frequency spike immediately next to the

fundamental spike at 30 Hz.

Other examples include cage defects in ball bearings, and

fluid turbulence.

Vibration analysis can be used to determine whether

bearings have been properly installed.

In a taper bearing, for example, the inner race has to be

expanded to take up the clearance between the rotating

element and the outer race.

If that clearance is not removed, the bearing may wind up

crooked or wobbling.

This will introduce non-periodic features into the vibration

signal. Phase analysis also can be used to check bearing

concentricity – using proximity sensors.

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