Methods for Analyzing Severity-Mitigation in FMEA

Paper #:
  • 2017-01-0325

Published:
  • 2017-03-28
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Abstract:
Severity-mitigating mechanisms (typically software-based) detect failures in a system and perform functions in order to reduce the severities of failures. Various approaches to FMEA analysis of severity-mitigating mechanisms exist within the industry. Three are compared and contrasted. Each method is compared against its ability to capture the three fundamental failures of a system that has severity-mitigating mechanisms: 1. a failure occurs and mitigating action is taken, 2. a failure occurs and mitigating action is not taken, 3. no failure occurs but mitigating action is taken. One method is advocated over the others because it: uses existing FMEA formatting; addresses all three cases; supports consistent linkage between FMEAs in a hierarchy of systems with any number of layers.
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