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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: Ela
Date posted: Sat Jun 28 9:17:29 US/Eastern 2003
Subject: Reliability Evaluation
Message:
We are searching for a new methods of reliability evaluation based on field data instead of regular MTBF calculation.We found that this attitute is simple but not compatible with reality evidences.May be something like first/next failire or weakest link? Do you have any expearence in this field? Thank you,


Reply:

Subject: Reliability Evaluation
Reply Posted by: bwd (bdudley@alionscience.com )
Organization: RAC
Date Posted: Wed Jul 9 14:20:35 US/Eastern 2003
Message:
The use of actual operating data is always the best way to determine the reliability of the product. Predictions are just predictions. Prediction accuracy depends on the parts selected, the application designed and environment operated. Trend analysis can be performed with actual data and weak links or failure prone items can be identified for possible correction. Prediction data is limited in performing trend analysis to worst case stress, failure mode and comparison of competing design approaches.


Reply:

Subject: Field Reliability
Reply Posted by: Larry George (pstlarry@comcast.net )
Organization: Problem Solving Tools
Date Posted: Sat Jul 26 13:09:09 US/Eastern 2003
Message:
Dubley is right. Reliability is the probability of successful function [according to customers] to specified ages [DoA, warranty, useful life, PM, and so on] under specified conditions [in the field in the hands of customers]. This definition is useful, because it provides just cause for actions such as: warranty reserves, spares, service planning, diagnostics, and retirment. Reliability, in the form of P[Life > t] for all t within the useful life of products and their service parts, is available. Generally accepted accounting principles require statistically sufficient data, even if you don't track products by serial number to record their ages at failures. Please refer to http://www.fieldreliability.com for more information and free samples.


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