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doh CH4

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Robin Clark 2013-09-08 12:59:28 +01:00
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submission_thesis/CH2_FMEA/copy.tex
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@ -1476,6 +1476,8 @@ potential strategies are listed below:
\item Look at components forward of the {\fm} in the signal path, \item Look at components forward of the {\fm} in the signal path,
\item Look at all components in the signal path, \item Look at all components in the signal path,
\item Look at all components in the signal path including those one connection removed, \item Look at all components in the signal path including those one connection removed,
% dependency tree is a logical construct.
\item Look at all components within pre-determined dependency models~\cite{cbds}[Ch.5],
\item Look at all components in the system (i.e. XFMEA). \item Look at all components in the system (i.e. XFMEA).
\end{itemize} \end{itemize}
No current variant of FMEA gives any guidelines for which, or how many components to check for a given {\fm}. No current variant of FMEA gives any guidelines for which, or how many components to check for a given {\fm}.

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submission_thesis/CH4_FMMD/copy.tex
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@ -1460,6 +1460,16 @@ in the base components. Coupled with MTTF statistics for the base components
this allows prediction of statistical failure rates for system level failures (this is this allows prediction of statistical failure rates for system level failures (this is
described in greater detail in section~\ref{sec:determine_fms}). described in greater detail in section~\ref{sec:determine_fms}).
% %
The connections from a given system~failure can be used to determine the
components that are necessary to function correctly to avoid its occurrence.
%
%
% NO dependency trees are logical contructs, I dont think FMMD helps here
% Thus dependency trees~\cite{cbds}[Ch.5] can be derived from
% FMMD models by collecting system failure modes in terms of their
% system level application (i.e. if system level failures $\alpha,beta$ or $\gamma$ occur function $\omega$
% of the system will be impaired, and )
% %
We can also use the FMMD model to derive information We can also use the FMMD model to derive information
to assist in creating related models such as FTA~\cite{nucfta,nasafta}, to assist in creating related models such as FTA~\cite{nucfta,nasafta},
traditional FMEA, FMECA~\cite{safeware}[p.344], FMEDA~\cite{scsh}, diagnostics schemas~\cite{dbamafta} traditional FMEA, FMECA~\cite{safeware}[p.344], FMEDA~\cite{scsh}, diagnostics schemas~\cite{dbamafta}