diff --git a/submission_thesis/CH2_FMEA/copy.tex b/submission_thesis/CH2_FMEA/copy.tex index 457ff4b..dc7bcc8 100644 --- a/submission_thesis/CH2_FMEA/copy.tex +++ b/submission_thesis/CH2_FMEA/copy.tex @@ -3,7 +3,7 @@ \label{sec:chap2} The generic and statistical European Safety Standard, EN61508:6\cite{en61508}[B.6.6] -describes FMEA as: +describes Failure Mode Effect Analysis (FMEA) as: \begin{quotation} ``To analyse a system design, by examining all possible sources of failure of a system's components and determining the effects of these failures @@ -262,8 +262,9 @@ is significantly reduced, enough for some standards to exclude it~\cite{en298}~\ \paragraph{Resistor failure modes according to EN298.} -EN298, the European gas burner safety standard, tends to -provide failure modes more directly usable for performing FMEA than FMD-91. +EN298, the European gas burner safety standard, +tends to be give failure modes more directly +usable for performing FMEA than FMD-91. % EN298 requires that a full FMEA be undertaken, examining all failure modes of all electronic components~\cite{en298}[11.2 5] as part of the certification process. @@ -441,7 +442,7 @@ that we got from FMD-91, listed in equation~\ref{eqn:opampfms}. FS8: PIN 8 OPEN & & (Vcc) disconnected & & $NOOP_A$ and $NOOP_B$ \\ \hline & & & & \\ & & & & \\ - +submission_thesis/CH2_FMEA/copy.tex submission_thesis/CH2_FMEA/copy.tex.03APR2012 & & & & \\ \hline FS9: PIN 1 $\stackrel{short}{\longrightarrow}$ PIN 2 & & A -ve 100\% Feed back, low gain & & $LOW_A$ \\ \hline diff --git a/submission_thesis/CH8_Conclusion/copy.tex b/submission_thesis/CH8_Conclusion/copy.tex index 744a6d0..b601d63 100644 --- a/submission_thesis/CH8_Conclusion/copy.tex +++ b/submission_thesis/CH8_Conclusion/copy.tex @@ -347,3 +347,13 @@ we thus reveal design deficiencies. %in the hardware/software interface. In Safety Integrity Level (SIL)~\cite{en61508} terms, by identifying undetectable faults and fixing them, we raise the safe failure fraction (SFF). + + + +\section{Conclusion} + +It is the authors belfief that the practise of FMEA would be imporoved by taking a modular approach +and that it is necessary that software and hardware should be included n the same failure mode models. +% +The proposed methodology, FMMD, provides the means to do this, and it is the authors hope that this +or a variant thereof is taken up and used to improve system safety. \ No newline at end of file