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Robin Clark 2013-09-25 19:27:55 +01:00
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18
submission_thesis/CH2_FMEA/copy.tex
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@ -193,7 +193,7 @@ typically of the form of examining scenarios such as
%are examined.
%
%
FMD-91 is a reference document released into the public domain by the United States DOD
FMD-91~\cite{fmd91} is a reference document released into the public domain by the United States DOD
and describes `failures' of common electronic components, with percentage statistics for each failure.
%
FMD-91 entries include general descriptions of internal failures alongside {\fms} of use to an FMEA investigation.
@ -418,7 +418,7 @@ For Op-Amp failures modes, FMD-91\cite{fmd91}{3-116] states,
These are mostly internal causes of failure, more of interest to the component manufacturer
than a test engineer % designer
looking for the symptoms of failure.
looking for symptoms of failure.
%
These failure causes within the Op-Amp need to be translated to symptomatic {\fms}.
%
@ -570,13 +570,13 @@ $$ fm(OPAMP) = \{ LOW, HIGH, NOOP, LOW\_SLEW \} . $$
The EN298 pinouts failure mode technique cannot reveal failure modes due to internal failures,
and that is why it misses the $LOW\_SLEW$.
and that is why it misses $LOW\_SLEW$.
%
The FMD-91 entries for op-amps are not directly usable as
component {\fms} in FMEA and require interpretation.
%
However, once a failure mode analysis has been carried out, the model can
be used throughout the FMEA process.
However, once a failure mode determination has been carried out, the model can
be re-used throughout the FMEA process.
%%%% Talk about R differences ?? XXXXX
@ -734,7 +734,7 @@ the circuit behaviour is measured in finer granularity,
%
With this style of fault finding, because it is based on experiment,
hopping from module to module eliminating working ones, until
failure is found~\cite{maikowski}, it is efficient in terms of
failure is found~\cite{maikowski}, is efficient in terms of
concentrating effort.
%
The rationale and work-culture of those tasked to
@ -985,7 +985,7 @@ deduced).
\fmmdglossRD
Reasoning distance, is the number of stages of logic and reasoning used
in {\fm} analysis to map a failure cause to its potential outcomes; counted
by th number of {\fm} to component checks made.
by the number of {\fm} to component checks made.
%
The basic FMEA example in section~\ref{basicfmea}
considered one {\fm} against some of the components in the milli-volt reader.
@ -1153,7 +1153,7 @@ cost, problems to be addressed in product production.
It generally focuses on known problems and using their
statistical frequency %they occur
and their cost to fix multiplied gives a Risk Priority Number (RPN)
number for the germane component {\fm}.
for the germane component {\fm}.
%
Fixing problems with the highest RPN number
will return most cost benefit~\cite{bfmea}.
@ -1274,7 +1274,7 @@ The highest $C_m$ values would represent the most dangerous or serious
system level failures.
The highest $C_m$ values would be at the top of a `to~fix' list
for a project manager, and some levels of risk may be considered unacceptable
and require re-design of some systems.
and require re-design. % of some systems.
\fmmdglossFMECA
\section{FMEDA - Failure Modes Effects and Diagnostic Analysis}