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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

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Original Message:

Posted by: Chris Armetta (chris.armetta@andrew.com )
Date posted: Tue Jun 18 11:57:24 US/Eastern 2002
Subject: Markov Modeling and European Reliability
Message:
We are working with several customers from Europe that are starting to ask for some analysis that is unique. Such things as Markov Modeling, FMECA with that modeling and Accelerated life testing for determining in use MTBF. This is usually above what US companies are asking. My question is this. Is the European standards (what are they) different that US standards (what are they) for commercial industry? I am begining to suspect that Europe and the US are diverging with regards to how we evaluate a product and required or commonly asked for reliability results.


Reply:

Subject: European Reliability
Reply Posted by: Ken Burgess (burgessfk@ISL-3Com.com )
Organization: L-3 Communications Integrated Systems
Date Posted: Tue Jun 18 17:10:00 US/Eastern 2002
Message:
The documents used in Europe are Allied Reliability and Maintainability Program (ARMP) 1 thru 8. Each dash number is a separate volume. However, each country may have modifying or incorporating documents depending on their acquisition strategies. For instance, the UK uses the Defence Standard (Def Stan) 00-40 Part series to implement the ARMP. Def Stan 00-40 Part 1 implements ARMP-1, Def Stan 00-40 Part 2 implements ARMP-2 and so on thru 8. Def Stan 00-41 thru 00-49 defines the UKs R&M program. Def Stans can be downloaded from www.dstan.mod.uk. Some ARMPs were available on http://assist.daps.mil. You are correct in that they do require documentation not necessarily requested in the US today. Hope this helps.


Reply:

Subject: Markov, FMECA, etc.
Reply Posted by: Joe Dzekevich
Date Posted: Wed Jun 19 12:09:24 US/Eastern 2002
Message:
It also depends on what business/market they are in. It is not uncommon for commercial telecom and networking companies to use Markov models to solve for availability and MTBCF. Likewise, for power supply companies to use FMECA and fault-tree analysis. The real add in a design for reliability program is using these tools to improve the design as the product is being developed.


Reply:

Subject: Markov, ...
Reply Posted by: Jean-Marie CLOAREC (Jean-Marie.Cloarec@ligeron.com )
Organization: LIGERON SA
Date Posted: Wed Jun 26 2:55:37 US/Eastern 2002
Message:
In France we use currently these standards, especially for military systems. The objective is to build reliability, maintainability, safety, ... during the phase of design. So we need "sophisticated" method. The early use of these method shown that it is costless than update or retrofit system. But these methods are not so difficult to use.


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