SRC Forum - Message Replies
Forum: Reliability & Maintainability Questions and AnswersTopic: Reliability & Maintainability Questions and Answers
Topic Posted by: Reliability & Maintainability Forum
(src_forum@alionscience.com
)
Organization: System Reliability Center
Date Posted: Mon Aug 31 12:47:36 US/Eastern 1998
Original Message:
Posted by: Joc Delarche
(jocdelarche@yahoo.fr
)
Date posted: Fri Apr 26 4:59:44 US/Eastern 2002
Subject: Weibull parameter for MTBF
Message:
Dear all,
I need to do a MTBF for an electronic application. If I use the NPRD-95 book, I need to know the Weibull parameter for each component. How can I find this parameter or how can I calculate it from Data sheet components ?
Reply:
Subject: Weibull Parameters
Reply Posted by: Patrick Hetherington
(phetherington@alionscience.com
)
Organization: Reliability Analysis Center
Date Posted: Fri Apr 26 7:06:48 US/Eastern 2002
Message:
If your purpose is to calculate the MTBF for an electronic application, NPRD-95 will not provide much insight since all the components are either mechanical or electro-mechanical. EPRD-97 or PRISM should be used for electronic components. The data in NPRD-95 will not provide Weibull parameters since most of the data collected is does not include time to failure information. Rather the data is generally collected in the form of X failure in Y hours resulting in a average failure rate.
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