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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: Gupta (tg.gupta@tbg.tvse.co.in )
Organization:TVS -Electroncis
Date posted: Wed May 28 1:05:53 US/Eastern 2003
Subject: Usage of Reliability
Message:
While Reliability predication, how do i know that the component is following 1. Exponential Reliability or 2. Weibull reliability or 3. Log Normal Reliability. Is it avl. in PRISM package. If Suppose I am taking the field failure data, than how come I decide it.


Reply:

Subject: Prediction Vs. Distribution
Reply Posted by: BWD (bdudley@alionscience.com )
Organization: RAC
Date Posted: Tue Jun 3 10:15:49 US/Eastern 2003
Message:
The best way to determine the failure distribution is to test the items to failure in the expected environment. One can then analyze the failure distribution using Weibull characteristics to find the wearout points. The PRISM program is a prediction model based on past historical chance failure information. The PRISM results are exponentially distributed in that each failure is random in nature. Wearout characteristics are not included in PRISM. If you have test data that details the item life times to failure, then you can categorize the information using a Weibull plot to determine the distribution.


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