Optimal Age Replacement Versus Condition Based Replacement: Some Theoretical and Practical Considerations

Article

Geurts, Johannes H.J.   (1983, ASQC)   Eindhovan University of Technology, Netherlands

Journal of Quality Technology    Vol. 15    No. 4
QICID: 5455    October 1983    pp. 171-179
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Article Abstract

When times to failure of a unit follow the Weibull distribution, achievement of optimal costs under age replacement is shown to be quite insensitive to the value of the shape parameter. Moreover, it is shown that under condition based replacement considerable improvement on even optimal age replacement costs is possible for any time to failure distribution with increasing failure rate, provided that the unit possesses a measurable prognostic characteristic which predicts the moment of failure within a reasonable margin of error and a sufficient lead time to undertake (preventive) replacement before a failure actually occurs.

Keywords

Statistics,Age replacement,Mean time between failures (MTBF),Quality characteristics


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