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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: Johnson Wood (wuxiangping@huawei.com )
Date posted: Fri May 24 4:23:19 US/Eastern 2002
Subject: The value of reliability prediction
Message:
Reliability prediction is an important technique in reliability engineerig. But now, many people have doubts on its value. Because the prediction results are often quite different from the actual performance. Is reliability prediction useless?


Reply:

Subject: Relibaility prediction
Reply Posted by: Jean-Marie CLOAREC (Jean-Marie.Cloarec@ligeron.com )
Organization: LIGERON SA
Date Posted: Thu May 30 5:16:21 US/Eastern 2002
Message:
I think that reliability prediction have their utility. But you have not to hope to calculate the EXACT value. It give only indication about the figure to compare to target achievment. In fact reliability prediction are very useful if you can compare them to operational figures. If you want to estimate spares or preventive maintenance planning, you must take operational figures. I know some guys which correct reliability handbook data with factors issued from their operational experience, it takes times but the result have a good confidence level.


Reply:

Subject: The true value of a reliability prediction
Reply Posted by: Mark Bell (bellmw@nswc.navy.mil )Naval Surface Warfare Center
Date Posted: Wed Jun 12 12:46:52 US/Eastern 2002
Message:
The creation of a reliability prediction serves many purposes. It is used to ensure that electronic and mechanical stress analyses are performed to eliminate overstressed or marginal design performance. The prediction can also be used to estimate product reliability performance and should be used to support trade studies on different design approaches. Additionally, the prediction can be used to ensure all life items meet expected life. Another benefit of a prediction is that it allows reliability to be allocated to lower level specifications and establishes a requirements baseline for all component procurement, e.g. lot acceptance tests.


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