(redirected from Ball Pass Frequency Outer)
BPFOBall Pass Frequency Outer (ball bearings)
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The fault location could be identified by matching the measured impact frequency, using the well-establish Envelope Analysis Technique with one of fault characteristic frequencies; ball pass frequency inner (BPFI) for a fault on the inner race, ball pass frequency outer (BPFO) for a fault on the outer race or ball spin frequency (BSF) for a fault on the rolling element.
BSF, BPFO, and BPFI stand for ball spin frequency, ball pass frequency outer ring, and ball pass frequency inner ring, respectively, in the figure.
m BPFI Ball pass frequency outer. Hz BPFO Ball pass frequency inner.