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: IC
Date posted: Mon Mar 5 16:07:21 US/Eastern 2007
Subject: Reliability Apportionment
I am looking for information in relation to apportionment and the techniques used for calculating it. I have calculated the apportionment for a System with 6 sub-systems (Using the Equal Apportionment Technique from MIL-HDBK-338). NOW I am trying to calculate the apportionment for the sub systems with the new information that each sub system has now been "weighted" (i.e sub sys 1 will be responsible for 20% fo all system failures and Sub sys 2 47% etc etc). Can anybody tell me how I will calculate the new reliability apportionment based on the "weighted" factors or let me know of any techniques/equations that I can use.
Thanks for the help.
Subject: Reliability apportionment with side constraints
Reply Posted by: Larry George
Date Posted: Tue Mar 6 6:28:47 US/Eastern 2007
95.68% 90.35% 98.05% 98.05% 99.58% 96.67%
is the least squares solution that I get from a quick and dirty analysis. Check it. The product is 80%.
Consider using the workbook linked to www.fieldreliability.com/RalloMan.htm with your side constraints. Alternatively, plug in the parts costs and system failure costs and see what solution cost-based allocation leads to.