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Robin P. Clark 2012-09-12 16:54:25 +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
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).
%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}.
%
%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,
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}.
% 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.
%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.
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.
%
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
are discussed in section~\ref{sec:resistorfm}.}.
\begin{figure}[h]+
\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}
\includegraphics[width=200pt]{/CH4_FMMD/component.png}
% component.png: 436x136 pixel, 72dpi, 15.38x4.80 cm, bb=0 0 436 136
\caption{UML diagram of a component and its associated failure modes.}
\label{fig:component}
\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
\ref{fig:component} shows a component as a data
structure with its associated failure modes.