Safety Analysis from Bottom to Top and Top to Bottom
Authors: Kerim Çakmak
Abstract: When it comes to functional safety, there are several ways to handle. Failure Mode Effects Analysis (FMEA) is an analysis method, generally for testing reliability which is considered as a bottom to up approach. The idea is to identify all the possible faults of the system and analyse their effects. The safety point of view is added to this method when "criticality" is introduced. This is called Failure Mode Effects and Criticality Analysis. The idea is to identify the probability of failure modes against the severity of their consequences in addition to FMEA studies. On the other hand, Fault Tree Analysis (FTA) is a top down approach to identify safety related risks of the system. In this paper, we would like to present how it would be possible to use both methods to verify each other in terms of completeness and validity. We will use a conceptual approach and try to implement these concepts in analysis tools for automation and reporting.
Keywords: Safety Assessment, FMECA, Hazard, FTA, Safety Goals, Requirements, Traceability
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