Forum: Reliability & Maintainability Questions and Answers

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Posted by: Mohammad Eyadat (meyadat@soma.csudh.edu )
Organization:CSUDH
Date posted: Mon Nov 13 20:31:07 US/Eastern 2000
Subject: Failure data needed
Message:
I am currently working on a research project to enhance the software reliability models. Test data are urgently needed. The data should meet the following criteria.
1. They are collected from testing computer software programs. 2. Data are recorded as the (execution) times between two consecutive failures over a specified period of time. Anyone has information leading me to the data sets?

Replies:
Software Failure Data
Bruce Dudley Thu Nov 16 13:04:19 US/Eastern 2000

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Posted by: Klaus Denkmayr (k.denkmayr@sat.steyr.com )
Organization:ZF STEYR
Date posted: Thu Nov 9 5:59:26 US/Eastern 2000
Subject: pressure - lifetime relationship
Message:
A variable displacement pump is one of the key subsystems of our new automatic transmission. We have to define an accelerated test procedure to estimate the lifetime of the pump.
Where can I find a relation between pressure and lifetime for a pump? Thanks in advance, Klaus

Replies:
Pump Lifetime
Bruce Dudley Wed Nov 15 9:13:51 US/Eastern 2000

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Posted by: Juan C. Rodenas (info@einsa.es )
Organization:EINSA
Date posted: Tue Oct 31 4:00:34 US/Eastern 2000
Subject: Relex vs PRISM
Message:
I am trying to adquire a reliability software for my company. I have notice of two different programs for this Prism and Relex(reliability package).
The differences in prices are significant but I do not find big differences. Does somebody on the forum have experience in both of them of have identified any important differences? Thank you in advance.

Replies:
PRISM
Mary Priore Tue Oct 31 11:05:32 US/Eastern 2000

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Posted by: Paul Cottrell (paul.cottrell@bae.co.uk )
Date posted: Mon Oct 30 5:53:24 US/Eastern 2000
Subject: Reliability Data for Motorola MVEME2400 Power PC boards
Message:
Has anybody any "field data" for the Motorola MVME2400 Power Pc Boards.

Replies:
MVME Power PC Board Failure Data
Bruce Dudley Tue Oct 31 12:36:52 US/Eastern 2000

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Posted by: Keith Chinchar (chinc_k@tdipower.com )
Date posted: Wed Oct 25 14:09:32 US/Eastern 2000
Subject: Endurance versus HALT
Message:
I'm performing HALT tests to demonstrate MTBF for electronic assemblies (power supplies in particular). I understand the application of the various acceleration models (Arrhenius, Peck, Kemeny, Lawson, etc.) for adding the stresses of temperature, humidity and voltage (et. all)to obtain an acceleration factor. However, I've run into a situation that adds the stress of cycling a unit on and off (demonstrating a duty cycle) during the duration of the test. I realize that this will cause a thermal cycling effect on the multitude of failure mechanisms within my device. I'm planning to run my test at an elevated temperature and apply the Arrhenius model to obtain an acceleration factor. How do I estimate an acceleration factor that takes into account the duty cycle (it would need to consider the duty cycle and the total number of cycles over the life expectancy of the product)? Will the Coffin-Manson relationship / inverse power law apply here? Any help is appreciated. Thanks in advance

Replies:
Endurance versus HALT
Ken Tonnesen Wed Nov 1 13:13:57 US/Eastern 2000

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