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Robin Clark 2010-07-28 13:35:24 +01:00
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symptom_ex_process/topbot.tex
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@ -35,6 +35,24 @@ and checks will be made, and finally a component or a low level sub-system
will be found to be faulty. will be found to be faulty.
A natural fault finding process is thus top~down. A natural fault finding process is thus top~down.
Top down fault isolation/finding techniques are described in \ref{NETWORKDECOMPOSITION}. Top down fault isolation/finding techniques are described in \ref{NETWORKDECOMPOSITION}.
%% insert diagram here
\begin{figure}[h]
\centering
\includegraphics[width=300pt,bb=0 0 587 445,keepaspectratio=true]{./top_down_de_comp.jpg}
% top_down_de_comp.jpg: 587x445 pixel, 72dpi, 20.71x15.70 cm, bb=0 0 587 445
\caption{Top Down Failure De-Composition Diagram}
\label{fig:tdh}
\end{figure}
\subsection{Top-Down System De-Composition}
A top down fault analysis system will take a system and divide it into
several sub-systems, and determine the safety dependencies
of the System on those sub-systems. In the case of large complicated
Systems, the sub-systems themselves may be broken down into simpler sub-systems.
A top down hierarchy is shown in figure \ref{fig:tdh}.
\subsection{FMMD - Bottom~up Analysis} \subsection{FMMD - Bottom~up Analysis}
The FMMD technique does not follow the `natural fault finding' or top down approach, The FMMD technique does not follow the `natural fault finding' or top down approach,
it instead works from the bottom up. it instead works from the bottom up.