Vibration and Noise

The vibration and noise level of a bearing expresses component quality and bearing cleanliness.

SNFA bearings are inspected during final manufacturing stage with special three-frequency band test equipment to get further confirmation of the quality requirements.

This equipment also permits vibration analysis on frequency spectra to analyze the behavior of each bearing component.

Typical bearing frequencies are closely correlated to their design and can be calculated with the following formulas:

BPFO: Frequency of ball passing over the outer ring.
BPFI: Frequency of ball passing over the inner ring.
BSF: Frequency of ball rotation about its axis.
FTF: Frequency of cage rotation.
(where “f” is the frequency, in Hz, of the relative bearing ring rotation.

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