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Corrected FMMD - vs FMEA rigourous

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comparison figures
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Robin Clark 2011-10-04 21:10:09 +01:00
parent ab6db72de9
commit 38c62a90dc
1 changed files with 4 additions and 4 deletions
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presentations/fmea/fmea_pres.tex
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@ -823,10 +823,10 @@ analysis scenarios to consider is show in equation~\ref{eqn:anscen}.
To see the effects of reducing `state~explosion' we can use an example.
% with fixed numbers
%for components in a functional group, and failure modes per component.
Let us take a system with 3 levels,
Let us take a system with 4 levels (with a top/system 0 level),
with three components per functional group and three failure modes per component,
and apply these formulae.
Having three levels (in addition to the top zero'th level)
Having 4 levels (in addition to the top zero'th level)
will require 81 base level components.
$$
@ -840,7 +840,7 @@ $$
$$
%\begin{equation}
% \label{eqn:anscen}
\sum_{n=0}^{3} {3}^{n}.3.3.(2) = 720
\sum_{n=0}^{4} {3}^{n}.3.3.(2) = 2178
%\end{equation}
$$
\end{frame}
@ -848,7 +848,7 @@ $$
\begin{frame}
\frametitle{FMMD - Failure Mode Modular De-Composition}
Thus for FMMD we needed to examine 720 failure mode scenarios, and for traditional FMEA
Thus for FMMD we needed to examine 2178 failure mode scenarios, and for traditional FMEA
type analysis methods 19440.
% In practical example followed through, no more than 9 components have ever been required for a functional
% group and the largest known number of failure modes has been 6.