SRC Forum - Message Replies
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
Posted by: Ken
Date posted: Sat Aug 31 1:03:39 US/Eastern 2002
Subject: AMSAA model
If our test data fails the AMSAA model, what other model can we used for RDGT? Is it a good alternative to use the first principle of total test duration divided by the number of failures to assess the instantaneous reliability of the system under test?
What's the difference between instantaneous relaibility and demonstrated reliability?
Subject: AMSAA Model
Reply Posted by: B.W.Dudley
Date Posted: Wed Sep 4 13:10:02 US/Eastern 2002
Test data cannot fail the AMSAA model. This model only indicates if the reliability is growing, standing still or has negative growth. Another model that can be considered is the use of the Duane model. This model is similar to the AMSAA model with some slight difference in the methods to calculate growth, instantaneous reliability and test lenght.Instantaneous reliability is calculated in the Duane model by dividing the cumulative value by one minus the growth rate. So, if we have positive growth, the instantaneous reliability will be higher or better than the cumulative reliability.