Fault Tree Analysis
"Fault Tree
Analysis (FTA) is one of the most important logic and probabilistic
techniques used in Probability Risk Assessment (PRA) and system
reliability assessment today. PRA and its underlying techniques,
including FTA, has become a useful and respected methodology for safety
assessment. Because of its logical, systematic and comprehensive
approach, PRA and FTA have been repeatedly proven capable of uncovering
design and operational weaknesses that escaped even some of the best deterministic
safety and engineering experts. Complex Electronics (CE) can use these
same techniques to determine failure scenarios. Critical outputs is a good place
to start. Remember, since CE is a hardware/software mix, to include the
software as you build the Fault Tree.
The figure below shows ways to include all components of a CE device in your fault tree.
The following links provide more
information and examples of a Fault Tree.
Examples:
http://pbma.nasa.gov/framework_content_cid_356
http://atc.nasa.gov/hostedEvents/rmc5/presentations/vesely1.ppt
http://www.hq.nasa.gov/office/codeq/doctree/fthb.pdf
http://www.nrc.gov/reading-rm/doc-collections/nuregs/staff/sr0492/
http://www.sverdrup.com/safety/fta.pdf
http://www.nepss.org/presentations/dfr10.pdf
http://www.weibull.com/basics/fault-tree/
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