Category: Reliability Analysis
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RA – Micro (day-to-day decision) analysis
Reliability Analysis: 2 dimensions (Statistical and probabilistic concepts) Reliability analysis is counting (slides) All types of analysis are about counting in one way or another. The elemental units of information that we count vary with each area of endeavor. Financial analysis is, of course, counting money and categorizing it in a variety of accounts that…
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LRCM – Reporting failure modes of rotable components
Living RCM demands that the technician transmit accurate, consistent information regarding the failure mode(s) found during the execution of a work order. But what if the technician does not know which failure mode in a removable complex component actually occurred? Introduction That would be the case when the event that causes the failure is due to…
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Does historical age data have value?
The following is a quote from a well known consultant: The biggest problem we have is lack of data… The data we do have in most cases is subject to different conditions as well. So if I have managed to collect 10 failures of a pump in 15 years, I am unlikely to be able…
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Reliability trend yes Weibull analysis no
Building a Weibull model from a sample of data that covers a prolonged duration assumes that all failure times observed are “independently and identically distributed” (iid). That means that no change occurred in the inherent reliability of the item over the duration of the data. However there are at least three reasons why this assumption…
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Diagnostics versus prognostics
Where is the divide between the process of troubleshooting and that of predictive condition based maintenance? Both sets of procedures require condition data and knowledge of failure behavior. How do these distinct processes work with one another? Some confusion in the purchase and application of maintenance technology tools can arise when the particular problem lacks sufficient…