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Tag: Weibull

  • The reliability data Catch 22

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    by

    Murray Wiseman
    in

    Ever wonder why poor historical work order data in the CMMS has been tolerated all these decades? One reason is that the fix is a human one. And human behavior is difficult to change. We tend to avoid difficult human problems, ultimately seeking a technological solution to everything. But there’s also a kind of paradox…

  • Real meaning of the six RCM curves

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    by

    Murray Wiseman
    in ,

    You may be wondering about the famous “RCM curves” shown below in Figure 1. They are the Age-Reliability behavior curves which graph the Conditional Probability of failure against age. A common question is the following. “For the 139 items covered in the Nowlan & Heap (UAL) study, for example, do these curves represent the real…

  • EXAKT vs Weibull

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    by

    Murray Wiseman
    in ,

    The difference is that Weibull is a reliability analysis procedure in two dimensions, namely Reliability versus Age. Its main purpose is to discover the relationship (equation) relating reliability and age. EXAKT is a reliability analysis software that relates several dimensions, namely Reliability versus Age versus each monitoring variable (condition indicator) discovered in the analysis procedure…