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).