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Old September 15th, 2014, 01:35 AM
Markus Markus is offline
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Join Date: Sep 2014
Posts: 2
Default B10 cascade to sub-systems

Dear friends of reliability,
Could you please help me with an issue, I have?
Would be great help for me.
When I have a B10 lifetime taget of lets say 200,000 miles for an entire vehicle - how do I cascade this down to sub-systems like engine, transmission, axles, ... ?
Is there a calculation methodology to use?
Each sub-system should have >200,000 miles, right?
Is it in the end a question on how many sub-systems I define?
Thank you very much and best regards, Markus
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Old September 25th, 2014, 10:06 AM
David David is offline
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Join Date: Apr 2003
Location: Tucson, Arizona
Posts: 651
Default Re: B10 cascade to sub-systems

Hi Markus,

From a reliaiblity perspective that does not take into account maintenance, reliability allocation can be used. Information on reliability allocation can be found at the following links:

http://www.weibull.com/hotwire/issue99/relbasics99.htm (Reliability Allocation and Optimization Using BlockSim).
http://www.reliasoft.tv/blocksim/app..._app_ex_2.html (Optimized Reliability Allocation)

If you want the reliability requirements for the components to be in terms of B10 values, you can use a Beta estimate to convert the reliabiltiy to a B10 life.

I hope this helps.
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