Weibull++ Standard Folio Data Lognormal: Difference between revisions

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The lognormal distribution is commonly used to model the lives of units whose failure modes are of a fatigue-stress nature. It has an increasing failure rate behavior and then decreasing towards the end of life.  
The lognormal distribution is commonly used to model the lives of units whose failure modes are of a fatigue-stress nature. It has an increasing failure rate behavior and then decreasing towards the end of life.  
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The ''pdf'' is given by: <br>
<math>f({T}')=\frac{1}{{{\sigma }_{{{T}'}}}\sqrt{2\pi }}{{e}^{-\tfrac{1}{2}{{\left( \tfrac{{{T}^{\prime }}-{\mu }'}{{{\sigma }_{{{T}'}}}} \right)}^{2}}}}</math>
<br> where,
<br><math>{T}'=\ln (T)</math><br>
the natural logarithm of the time-to-failure  and
<br><math>\mu' \text{ and } \sigma_{T'}</math><br>
are the mean and standard deviation of of the natural logarithms of the times-to-failure.
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|  valign="middle" | [http://reliawiki.com/index.php/Template:Lognormal_distribution Lognormal Distribution]
|  valign="middle" | [http://reliawiki.com/index.php/Template:Lognormal_distribution Lognormal Distribution]
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Revision as of 23:42, 5 March 2012

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Weibull Folio- Lognormal

The lognormal distribution is commonly used to model the lives of units whose failure modes are of a fatigue-stress nature. It has an increasing failure rate behavior and then decreasing towards the end of life.

Lognormal Distribution
See an example...


Learn more from...

Helpblue.png [Link1 the help files...]
Book blue.png [Link2 the theory textbook...]
Articleblue.png [Link3 related article(s)...]
Bulbblue.png [Link4 use example(s)...]






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