Forum: Reliability & Maintainability Questions and Answers

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Posted by: Beth Chappel (elizabeth.chappel@goodrich.com )
Organization:Goodrich
Date posted: Tue Aug 7 18:46:41 US/Eastern 2001
Subject: Weight Averaging
Message:
Question- can you weight average reliability over time? For instance, if you have a system that operates at one reliability value R for a third of the time, and another reliability R2 for two-thirds of the time, would the reliability for one hour be = 1/3 R + 2/3 R2?

Replies:
Weight Averaging
Gary Sunada Thu Sep 13 9:54:19 US/Eastern 2001

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Posted by: Diane Gordon (info@reliability.com )
Organization:Reliability Center, Inc.
Date posted: Fri Aug 3 9:48:39 US/Eastern 2001
Subject: Cost of Downtime
Message:
I'm trying to find general values for the cost of downtime (cost of lost production or the cost of shutdown and restart) for large continuous processes like refineries, paper mills, steel mills, or petrochemical plants?
Does anyone have this type of information or know some resources I can tap into?

Replies: (list all replies)
Cost of Downtime
Gary Sunada Mon Aug 13 10:22:36 US/Eastern 2001
Cost of Downtime
Bruce Dudley Mon Aug 20 10:31:43 US/Eastern 2001

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Posted by: Lemort Alexandre (lemort_alex@yahoo.fr )
Organization:CENA (Centre d'Etudes de la Navigation Aérienne) (France)
Date posted: Wed Aug 1 9:18:35 US/Eastern 2001
Subject: Neural network and software reliability
Message:
Hello,
I'm looking for any information concerning neural network and software reliability (how to use neural network to estimate software reliability, etc..) If anyone is aware of current or on-going work in this area (public or private), I would appreciate it if you could pass along a source and/or point of contact. I'm, also, looking for any informations concerning "a posteriori" techniques to estimate software reliability. Thank you!

Replies:
Software rel using neural nets
Sekhar Vaidyanath Thu Aug 9 8:28:13 US/Eastern 2001

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Posted by: Ian
Date posted: Tue Jul 31 11:00:14 US/Eastern 2001
Subject: MTBF's
Message:
I have the MTBF of a single component. How would I calculate the total MTBF for 2 of these components if it is a 1 out of 2 standby redundancy.
Thanks in advance

Replies: (list all replies)
Redundancy
Patrick Hetherington Fri Aug 3 7:19:52 US/Eastern 2001
Redundancy
Sekhar Vaidyanath Thu Aug 9 8:42:12 US/Eastern 2001

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Posted by: Ruby
Date posted: Mon Jul 30 13:08:41 US/Eastern 2001
Subject: Space Between Two Lines
Message:
Are there any guidelines or standards about the pad space between two high voltage lines? The voltage is around 180V. Thanks in advance.
Ruby

Replies:
Circuit Design Rules
B.W.Dudley Tue Aug 7 10:16:26 US/Eastern 2001

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