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Reliability Hotwire: The Risks of Using Failure Rate to Calculate Reliability Metrics

Reliability HotWire is a monthly eMagazine by ReliaSoft providing information and tips on how to best improve your reliability practices and get the most out of ReliaSoft’s tools for reliability and life data analysis. This article looks into the risk of using failure rate to calculate reliability metrics. 

Hotwire

A mistake that is often made when calculating reliability metrics is trying to use the failure rate function instead of the probability of failure function (CDF). These two functions, along with the probability density function (pdf) and the reliability function, make up the four functions that are commonly used to describe reliability data. This article will provide a brief overview of each of these four functions, followed by a discussion of how to obtain the pdf, CDF and reliability functions from the failure rate function. Finally, an example will be shown of the error that can be introduced in unreliability calculations by using an approximation based on the failure rate

For full article, view: Reliability Hotwire – Issue 196 June 2017

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