Forum: Reliability & Maintainability Questions and Answers

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Posted by: Ricardo DiScioscia (ricardo.discioscia@honeywell.com )
Organization:Honeywell
Date posted: Fri Mar 15 14:35:48 US/Eastern 2002
Subject: CL vs ML Environments
Message:
I need the specifics to the Cannon Launch & Missile Launch environments listed in PRISM and or 217F. Specifically, I need the shock and random vibration profiles. I would appreciate the help. Thanks.

Replies:
ML and CL Environmental Profiles
B.W.Dudley Mon Mar 18 13:29:46 US/Eastern 2002

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Posted by: andrew Comons
Date posted: Thu Mar 14 20:25:29 US/Eastern 2002
Subject: Reliability With degraded Mode of Operation
Message:
How does the industry handle a MTBF calculation whereby, a mission (single system)may permit operation in a degraded mode? Assuming that a failure did not prevent the degraded mode operation, how would the MTBF calculation be made? For the designer's specification, do I have to specify two different MTBF's - one MTBF for the entire system and another MTBF for degraded system? Or do I specify my maximum mission reliability as the minimum for all hardware relevant to the degraded state? I cannot find much written on this degraded scenario.

Replies:
Degraded mode of operation
Dave Reinert Thu Mar 28 11:01:04 US/Eastern 2002

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Posted by: J Turnbull (john.turnbull@trw.com )
Date posted: Thu Mar 14 10:53:39 US/Eastern 2002
Subject: Electric Permanent Magnet Motor
Message:
Does anyone have any experience with reliability predictions for Permanent Magnet Electric Motors?
I am looking for an Overall target for the motor Reliability/failure rate.

Replies: (list all replies)
Permanent Magnet Electric Motor
B.W.Dudley Thu Mar 14 15:29:07 US/Eastern 2002
Re
J Turnbull Fri Mar 15 5:46:13 US/Eastern 2002

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Posted by: Johnson Wood (wuxiangping@huawei.com )
Date posted: Tue Mar 12 1:54:45 US/Eastern 2002
Subject: Confidence Level of Reliability Calculation
Message:
For example, there are tow components in a certain circuit. The failure rate for each of the components are given with a confidence level. One is 40 FITs, the confidence level is 80%, and another one is 15 FITs, the confidence lever is 60%. When I sum the failure rates of these tow components up to calculate the reliability of the circuit, what is the confidence level for the result?

Replies:
Confidence level
Jean-Marie CLOAREC Thu Mar 14 4:24:27 US/Eastern 2002

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Posted by: ANIL KUMAR (anilkumar_sng@yahoo.com )
Organization:CENTRE FOR RELIABILITY
Date posted: Thu Mar 7 6:49:23 US/Eastern 2002
Subject: MECHANICAL RELIABILITY
Message:
What is the life characteristic curve and failure distribution for mechanical parts. Electronic parts follow bath-tub characteristic and exponential distribution.What about mechanical components?

Replies: (list all replies)
MECHANICAL RELIABILITY
Johnny Campbell Wed Mar 13 12:35:26 US/Eastern 2002
Mechanical Failure Patterns
Patrick Hetherington Wed Mar 13 13:42:28 US/Eastern 2002

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