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: Ananda Perera (Ananda.Perera@alliedsignal.com )
Organization:AlliedSignal Aerospace Canada
Date posted: Mon Jul 26 17:08:38 US/Eastern 1999
Subject: ESS Vibration Exposure
Message:
Environmental Stress Screening Guidelines for Assemblies 1990 published by the Institute of Environmental Sciences indicate that; (1)After subsequent repairs and/or modifications, repeat screen at -3dB level (70% RMS g) for 50% duration; (2) Total number of vibration exposures should not exceed five. ##### It is not clear whether these values were based on the Random Vibration Spectrum shown in Page 15 which gives a 6 gRMS Vibration Level. QUESTION: The above parameters, can it be used for any Vibration Level ? Is there any other method to determine the maximum vibration exposure that will not use excessive amount of useful life ?

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