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JMC proof read

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Robin Clark 2012-06-21 20:48:27 +01:00
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commit e797ce5082
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11
submission_thesis/CH4_FMMD/copy.tex
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@ -481,6 +481,7 @@ defined by $ G_v = 1 + \frac{R2}{R1} $ at the output.
As the resistors work to provide a specific function, that of a potential divider, As the resistors work to provide a specific function, that of a potential divider,
we can treat them as a collection of components with a specific functionality---which can be termed a `{\fg}'. we can treat them as a collection of components with a specific functionality---which can be termed a `{\fg}'.
This {\fg} has two members, $R1$ and $R2$. This {\fg} has two members, $R1$ and $R2$.
%
Using the EN298 specification for resistor failure~\cite{en298}[App.A], Using the EN298 specification for resistor failure~\cite{en298}[App.A],
we can assign failure modes of $OPEN$ and $SHORT$ to the resistors individually (assignment of failure modes we can assign failure modes of $OPEN$ and $SHORT$ to the resistors individually (assignment of failure modes
is discussed in more detail in section~\ref{sec:resistorfm}). is discussed in more detail in section~\ref{sec:resistorfm}).
@ -502,7 +503,7 @@ We represent a resistor and its failure modes as a directed acyclic graph (DAG)
\path (R) edge (RSHORT); \path (R) edge (RSHORT);
\path (R) edge (ROPEN); \path (R) edge (ROPEN);
\end{tikzpicture} \end{tikzpicture}
\caption{DAG representing a resistor and its failure modes} \caption{DAG representing a resistor and its failure modes.}
\label{fig:rdag} \label{fig:rdag}
\end{figure} \end{figure}
@ -998,7 +999,7 @@ Failure Scenario & A single failure mode (or a combination), used to
\subsection{Parts, Components and Base Components.} \subsection{Parts, Components and Base Components.}
A component is anything we use to build %a product or A component is anything we use to build a %a product or
system. system.
It could be something %quite complicated It could be something %quite complicated
like an %integrated like an %integrated
@ -1023,7 +1024,7 @@ and say that we want to define 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---or entities we begin with in our analysis---of component that we use as a building block. We define {\bc} to be the lowest level---or entities we begin with in our analysis---of component that we use as a 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.
% %
@ -1041,7 +1042,7 @@ to which we are approving/analysing a system.
%% FUCKING STEREO SUB_SYSTEM EXAMPLE, THE FUCKING CHILDRENS SECTION %% FUCKING STEREO SUB_SYSTEM EXAMPLE, THE FUCKING CHILDRENS SECTION
\subsection{definition of terms: sound system example.} \subsection{Definition of terms: sound system example.}
%000000elpful here to define the terms, `system', `functional~group', `component', `base~component', `symptom' and `derived~component/sub-system'. %000000elpful here to define the terms, `system', `functional~group', `component', `base~component', `symptom' and `derived~component/sub-system'.
%These are listed in table~\ref{tab:symexdef}. %These are listed in table~\ref{tab:symexdef}.
@ -1125,7 +1126,7 @@ the symptoms of failure of the {\fg} are the failure modes of this new `{\dc}'.
Electrical components have data-sheets associated with them. The data sheets Electrical components have data-sheets associated with them. The data sheets
supply detailed information on the component as supplied by the manufacturer. supply detailed information on the component as supplied by the manufacturer.
% %
Because they are design related they rarely rarely show %clearly detail the Because they are design related they rarely show %clearly detail the
failure modes of the component, with environmental factors and MTTF~\cite{sccs}[p.165] statistics. failure modes of the component, with environmental factors and MTTF~\cite{sccs}[p.165] statistics.
Given the growing usage of FMEA/FMEDA in industry this may change. Given the growing usage of FMEA/FMEDA in industry this may change.
Currently, failure mode information is generally only available for generic component types~\cite{mil1991, fmd91}. Currently, failure mode information is generally only available for generic component types~\cite{mil1991, fmd91}.