Category Archives: Theory and definitions

RCM vs RA

Posted on March 8, 2011 by Murray Wiseman

Is RCM a form of Reliability Analysis (RA)? RA is the counting of failure and suspension events in order to understand the behavior pattern of  a component or failure mode. RCM practitioners sometimes refer to the Reliability Centered Maintenance (RCM) … Continue reading →

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Purpose of RA

Posted on March 8, 2011 by Murray Wiseman

The purpose of reliability analysis (RA) is to build, assess the performance of, and continually improve maintenance policies. By a “maintenance policy” we mean a rule or process to be used for decision support. Why do we need policies? We … Continue reading →

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What is the scale parameter?

Posted on March 6, 2011 by Murray Wiseman

In Weibull analysis, what exactly is the scale parameter, η (Eta)? And why, at t = η , will 63.21% of the population have failed, regardless of the value of the shape parameter, β (Beta)? η (Eta) is called the … Continue reading →

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