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The FMECA method in LEVEL-UP project

General

Failure Mode Effects and Criticality Analysis (FMECA) is an extension of the Failure Mode and Effects Analysis, performed in a bottom-up way either on the whole system or on part levels. A crucial part of the FMECA is the Criticality Analysis, which correlates the probability of the Failure Mode with the severity of their consequences and the detection and occurrence of the Failure Modes. The produced results are presented according to the highest probability and indicates mitigation actions to address the possible issues in the system.


A typical FMECA analysis has nine logical steps: 1) System definition, 2) Identification of the failure modes, 3) Failure effects and causes analysis, 4) Failure effects classification based on the severity, 5) Criticality calculation, 6) Rank failure mode’s criticality, 7) Definition of the occurrence and detection levels of a failure mode, 8) Computation of the RPN to measure the risks of each of the failure modes and 9) Presentation of the analysis’ results in heat matrixes for the user convenience. The FMECA analysis (quantitative and/or qualitative) is usually performed in a part or a system level while a combination of these two is possible by creating the analysis tree. Within, the root is defined as the whole system while the branches are the sub-system and the leaves on the tree, where the first failure modes are defined, are the parts.

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