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Analysis methods for fault trees that contain secondary failures

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journal contribution
posted on 30.10.2008 by Sarah Dunnett, J.D. Andrews
The fault tree methodology is appropriate when the component level failures (basic events) occur independently. One situation where the conditions of independence are not met occurs when secondary failure events appear in the fault tree structure. Guidelines for fault tree construction that have been utilized for many years encourage the inclusion of secondary failures along with primary failures and command faults in the representation of the failure logic. The resulting fault tree is an accurate representation of the logic but may produce inaccurate quantitative results for the probability and frequency of system failure if methodologies are used that rely on independence. This paper illustrates how inaccurate these quantitative results can be. Alternative approaches are developed by which fault trees of this type of structure can be analysed.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Citation

DUNNETT, S. and ANDREWS, J.D., 2004. Analysis methods for fault trees that contain secondary failures. Proceedings of the Institution of Mechanical Engineers, Part E : Journal of Process Mechanical Engineering, 218 (2), pp. 93-102 [DOI:10.1243/095440804774134271]

Publisher

© IMechE / Professional Engineering Publishing

Publication date

2004

Notes

This article was published in the journal, Proceedings of the Institution of Mechanical Engineers, Part E : Journal of Process Mechanical Engineering [© IMechE] and is also available at: http://journals.pepublishing.com/content/119780

ISSN

0954-4089

Language

en

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