Category Archives: P-F Interval
Optimizing a Condition Based Maintenance Program with Gearbox Tooth Failure
A Condition Based Maintenance (CBM) policy is a procedure used by maintenance personnel to interpret a set of measured machine condition indicators and decide whether or not to renew a physical asset at the current moment. Traditionally CBM data interpretive policies … Continue reading
NAVAIR and the PF interval
This slide presentation provides some facts on the P-F interval. It concludes with a common misconception about the P-F graph.
The elusive P-F interval
This article discusses the P-F Interval for CBM decision making, its areas of usefulness, and those areas where it is inadequate as a predictive maintenance strategy. An alternative more general approach based on the EXAKT system is proposed. Two categories … Continue reading
Posted in P-F Interval
Tagged CBM, Conditional density function, Conditional MTTF, EXAKT, Risk, RULE
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P-F Interval a red herring?
The article describing EXAKT CBM optimization, “The Elusive P-F Interval“, may leave one with the impression that the P-F Interval is an irrelevant concept. The P-F Interval is a useful concept in certain simple cases. Nevertheless, it does detract from an … Continue reading
PF interval from the failure rate
How can the PF interval be determined from the failure rate? You can’t know the PF interval directly from the failure rate. The PF interval is unrelated mathematically to the failure rate. It is the lead time between the ability … Continue reading