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Forum: Reliability & Maintainability Questions and Answers

Topic: Reliability & Maintainability Questions and Answers

Topic Posted by: Reliability & Maintainability Forum ( )
Organization: System Reliability Center
Date Posted: Mon Aug 31 12:47:36 US/Eastern 1998

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Original Message:

Posted by: Wayne
Date posted: Mon Feb 24 8:05:38 US/Eastern 2003
Subject: AMSAA model fail
I have a query that is i have only 2 failures during my Reliability growth testing. I fit in into the AMSAA model and it fails the goodness of fit test. In this case can i represent the system reliability by it's Observed MTBF which is = total test duration/ total failures? If not are there a better alternative since i have only 2 data points.

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Subject: Reply on the above
Reply Posted by: Wayne
Date Posted: Tue Mar 11 21:24:15 US/Eastern 2003
Thanks for your long reply. As far as planning is concern, the total test duration is derived based on the Duane Model reliability planning.We currently have only 1 prototype so the number of units is constraint in our case. We only realise that there are only 2 chargeable failures after completing the whole test duration. In our case we could not stop at the 2nd or even 3rd failure, we have to complete the whole test duration. I thought it is suppose to be a time terminate test? Please advise!! Thanks

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