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: Chad
Date posted: Thu Oct 5 13:38:35 US/Eastern 2000
Subject: Reliability and Confidence Allocation
In many cases we need to allocate system reliability requirements down to component level. Reliability allocation is quite straight forward by using block diagram; however, what would be a good approach to allocate confidence requirement? If I demostrated reliability at 90% confidence for all components, can I calculate system reliability by using block diagram and claim 90% confidence at system level without system level testing? Any good suggestions, reference?
Reply Posted by: Jean Marie Cloarec
Organization: LIGERON S.A.
Date Posted: Tue Oct 10 7:45:01 US/Eastern 2000
All allocation algorithm are base on serial configuration (AGREE, arinc, feasibility of objective technique). And they all allocate a failure rate without confidense. So I can suggest you two ways:
- use a "monte carlo" simulation process,
- try to allocate the low and the hight value, but you will note obtain confidence interval on the result.