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Seem to have lost work on component failure modes

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-- the derivation of -- bolocks.
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Robin Clark 2012-03-09 08:55:20 +00:00
parent 8d009de6bd
commit 27f68c8f5b
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TO_DO_LIST.txt
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@ -2,6 +2,6 @@ Write up detailed failure modes essay for R and OPAMP with ref to EN298, FMD-91,
Get thesis template, have emailed Aidian on this. Get thesis template, have emailed Aidian on this.
Start writing up approvals backgrouns to static FMEA. Start writing up approvals backgrounds to static FMEA.

9
old_thesis/component_failure_modes_definition/component_failure_modes_definition.tex
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@ -74,7 +74,7 @@ Let us first define a component.
%This is anything with which we use to build a product or system. %This is anything with which we use to build a product or system.
This is anything we use to build a product or system. This is anything we use to build a product or system.
It could be something quite complicated It could be something quite complicated
like an integrated microcontroller, or quite simple like the humble resistor. like an integrated micro controller, or quite simple like the humble resistor.
We can define a We can define a
component by its name, a manufacturers' part number and perhaps component by its name, a manufacturers' part number and perhaps
@ -160,7 +160,7 @@ Parameter change not considered for EN298 because the resistors are down-rated f
maximum possible voltage exposure -- find refs. maximum possible voltage exposure -- find refs.
FMD-91 gives the following percentatges for failure rates in FMD-91 gives the following percentages for failure rates in
\label{downrate} \label{downrate}
The parameter change, is usually a failure mode associated with over stressing the component. The parameter change, is usually a failure mode associated with over stressing the component.
In a system designed to typical safety critical constraints (as in EN298) In a system designed to typical safety critical constraints (as in EN298)
@ -171,7 +171,7 @@ these environmentally induced failure modes need not be considered.
Literature suggests, latch up, latch down and oscillation. Literature suggests, latch up, latch down and oscillation.
FMD-91 states, V+ disconnected, V- V+ shorted, NOOP and Low slew. FMD-91 states, V+ disconnected, V- V+ shorted, NOOP and Low slew.
EN298 does not specifgically include OP_AMPS and these would fall under EN298 does not specifically define OP\_AMPS failure modes; these would fall under the procedure outlined in
table \cite{en298}[A.1 note e]. table \cite{en298}[A.1 note e].
This demands that all open connections, and shorts between adjacent pins be considered. This demands that all open connections, and shorts between adjacent pins be considered.
We can examine these failure modes by taking our 358 op-amp and examining We can examine these failure modes by taking our 358 op-amp and examining
@ -935,13 +935,14 @@ are added to UML diagram in figure \ref{fig:cfg} and represented in figure \ref
\begin{figure}[h] \begin{figure}[h]
\centering \centering
\includegraphics[width=400pt,keepaspectratio=true]{../master_uml.jpg} \includegraphics[width=400pt,keepaspectratio=true]{master_uml.jpg}
% cfg2.jpg: 702x464 pixel, 72dpi, 24.76x16.37 cm, bb=0 0 702 464 % cfg2.jpg: 702x464 pixel, 72dpi, 24.76x16.37 cm, bb=0 0 702 464
\caption{Complete UML diagram} \caption{Complete UML diagram}
\label{fig:cfg2} \label{fig:cfg2}
\end{figure} \end{figure}
\subsection{Ontological work on FMEA} \subsection{Ontological work on FMEA}