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Robin Clark 2012-09-13 11:10:58 +01:00
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submission_thesis/CH4_FMMD/copy.tex
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@ -158,7 +158,7 @@ In this way we can incrementally apply FMEA to an entire system. %, with documen
% %
This has advantages of concentrating This has advantages of concentrating
effort in where modules interact (interfaces), of effort in where modules interact (interfaces), of
being able to re-use work and a savings in the complexity of performing being able to re-use work and savings in the complexity of performing
FMEA (because the analysis is typically performed in several small stages). FMEA (because the analysis is typically performed in several small stages).
%A notation is then described to index and classify objects created in FMMD hierarchical models. %A notation is then described to index and classify objects created in FMMD hierarchical models.
@ -618,7 +618,7 @@ the number of failure modes to consider.
%to failure modes of the {\fg}. %to failure modes of the {\fg}.
% %
%This means that %This means that
We thus simplify the FMEA analysis task for further stages. We thus simplify the FMMD analysis task for further stages.
% %
By drawing vertices for failure modes, % symptoms, By drawing vertices for failure modes, % symptoms,
and edges for the relationships between them and edges for the relationships between them
@ -1133,12 +1133,12 @@ as a separate building block for a circuit. For FMMD each of these four op-amps
in the chip would be considered to be a separate {\bc}. in the chip would be considered to be a separate {\bc}.
% CAN WE FIND SUPPORT FOR THIS IN LITERATURE??? % CAN WE FIND SUPPORT FOR THIS IN LITERATURE???
% %
We, need to go further than the above definition of a part, and define % defining We need to go further than the above definition of a part, and define % defining
an atomic entity. % used as a building block. an atomic entity. % used as a building block.
%The term component, in American English, can mean a building block or a part. %The term component, in American English, can mean a building block or a part.
%In British-English a component generally is given to mean the definition for part above. %In British-English a component generally is given to mean the definition for part above.
We define {\bc} to be the lowest level---an entity with which we begin our analysis---a component We define {\bc} to be the lowest level---an entity with which we begin our analysis---a component
that we use as a building block. that we use as a starting bottom-up building block.
%This is a choice made by the analyst, often guided by the standards to which the analysis is being performed. % to. %This is a choice made by the analyst, often guided by the standards to which the analysis is being performed. % to.
% %
Both op-amps and transistors have published statistical failure rates and yet an op-amp is constructed from transistors. Both op-amps and transistors have published statistical failure rates and yet an op-amp is constructed from transistors.
@ -1299,15 +1299,22 @@ Thus we can associate a set of failure modes to types of component,
for example $ResistorFaultModes=\{OPEN, SHORT\}$\footnote{The failure modes of the resistor for example $ResistorFaultModes=\{OPEN, SHORT\}$\footnote{The failure modes of the resistor
are discussed in section~\ref{sec:resistorfm}.}. are discussed in section~\ref{sec:resistorfm}.}.
\begin{figure}[h]
\begin{figure}[h]+
\centering \centering
\includegraphics[width=300pt,bb=0 0 437 141,keepaspectratio=true]{CH4_FMMD/component.png} \includegraphics[width=200pt]{/CH4_FMMD/component.png}
% component.png: 437x141 pixel, 72dpi, 15.42x4.97 cm, bb=0 0 437 141 % component.png: 436x136 pixel, 72dpi, 15.38x4.80 cm, bb=0 0 436 136
\caption{A Component and its Failure Modes} \caption{UML diagram of a component and its associated failure modes.}
\label{fig:component} \label{fig:component}
\end{figure} \end{figure}
% \begin{figure}[h]+
% \centering
% \includegraphics[width=300pt,bb=0 0 437 141,keepaspectratio=true]{CH4_FMMD/component.png}
% % component.png: 437x141 pixel, 72dpi, 15.42x4.97 cm, bb=0 0 437 141
% \caption{A Component and its Failure Modes}
% \label{fig:component}
% \end{figure}
The UML class diagram in figure The UML class diagram in figure
\ref{fig:component} shows a component as a data \ref{fig:component} shows a component as a data
structure with its associated failure modes. structure with its associated failure modes.