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FMEDA - Accurate Product Failure Metrics

The letters FMEDA form an acronym for “Failure Modes Effects and Diagnostic Analysis.” The name was given by one of the authors in 1994 to describe a systematic analysis technique that had been in development since 1988 to obtain subsystem / product level failure rates, failure modes and diagnostic capability (Figure 1).


Figure 1: FMEDA Inputs and Outputs.

The FMEDA technique considers:

  • All components of a design,
  • The functionality of each component,
  • The failure modes of each component,
  • The impact of each component failure mode on the product functionality,
  • The ability of any automatic diagnostics to detect the failure,
  • The design strength (de-rating, safety factors) and
  • The operational profile (environmental stress factors).

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