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Forum: Reliability & Maintainability Questions and Answers

Topic: 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: IC
Date posted: Mon Mar 5 16:07:21 US/Eastern 2007
Subject: Reliability Apportionment
Message:
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.

Previous reply

Reply:

Subject: Reliability apportionment with side constraints
Reply Posted by: Larry George
Date Posted: Tue Mar 6 6:28:47 US/Eastern 2007
Message:
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.

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