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glossary definition of observability

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Robin P. Clark 2013-01-02 14:40:55 +00:00
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submission_thesis/CH2_FMEA/copy.tex
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@ -52,6 +52,7 @@ the effectiveness of FMEA.
% \subsection{FMEA}
% This talk introduces Failure Mode Effects Analysis, and the different ways it is applied.
% These techniques are discussed, and then
% a refinement is proposed, which is essentially a modularisation of the FMEA process.
@ -174,6 +175,7 @@ Often the effects of a failure mode may be easy to detect, and our equipment ca
Some failure modes may cause undetectable failure, for instance a component that causes
a measured reading to change could have dire consequences yet not be obvious.
In fault diagnosis failures are said to be observable and unobservable~\cite{721666, ACS:ACS1297}.
\glossary{name={observability}, description={The property of a system failure in relation to a particular component failure mode, where it can bedetermined whether the readings/actions associated     with it are valid, or the by-product of a failure. If we cannot determine that there is a fault present, the system level failure is said to be unobservable.}}
\paragraph{Impracticality of Field Data for modern systems}