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Robin Clark 2010-11-08 19:23:14 +00:00
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fmmd_concept/fmmd_concept.tex
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@ -616,7 +616,7 @@ create higher level {\fg}s in later stages.
%%- %%-
\begin{figure}[h] \begin{figure}[h]
\centering \centering
\includegraphics[width=200pt,bb=0 0 331 249,keepaspectratio=true]{./fmmd_hierarchy.jpg} \includegraphics[width=200pt,bb=0 0 331 249,keepaspectratio=true]{./fmmd_concept/fmmd_hierarchy.jpg}
% fmmd_hierarchy.jpg: 331x249 pixel, 72dpi, 11.68x8.78 cm, bb=0 0 331 249 % fmmd_hierarchy.jpg: 331x249 pixel, 72dpi, 11.68x8.78 cm, bb=0 0 331 249
\caption{Example derived component created from the functional group comprised of components a,b,c} \caption{Example derived component created from the functional group comprised of components a,b,c}
\label{fig:fmmd_hierarchy} \label{fig:fmmd_hierarchy}
@ -636,7 +636,7 @@ create higher level {\fg}s in later stages.
% \vspace{20pt} % \vspace{20pt}
\subsection{Environmental and Operational States and FMMD} \subsection{Environmental Conditoions, Operational States and FMMD}
Any real world sub-system will exist in a variable environment and may have several modes of operation. Any real world sub-system will exist in a variable environment and may have several modes of operation.
In order to find all possible failures, the sub-system must be analysed for each operational state In order to find all possible failures, the sub-system must be analysed for each operational state
@ -694,7 +694,7 @@ with the ENV and OP\_STAT classes associated with them
\begin{figure}[h] \begin{figure}[h]
\centering \centering
\includegraphics[width=400pt,bb=0 0 818 249,keepaspectratio=true]{./fmmd_env_op_uml.jpg} \includegraphics[width=400pt,bb=0 0 818 249,keepaspectratio=true]{./fmmd_concept/fmmd_env_op_uml.jpg}
% fmmd_env_op_uml.jpg: 818x249 pixel, 72dpi, 28.86x8.78 cm, bb=0 0 818 249 % fmmd_env_op_uml.jpg: 818x249 pixel, 72dpi, 28.86x8.78 cm, bb=0 0 818 249
\caption{UML model of Environmental and Operational states w.r.t FMMD} \caption{UML model of Environmental and Operational states w.r.t FMMD}
\label{fig:env_op_uml} \label{fig:env_op_uml}
@ -769,7 +769,9 @@ for its results (MTTF and the cause trees for SYSTEM level faults).
\item Overall reliability and danger evaluation statistics can be computed. \item Overall reliability and danger evaluation statistics can be computed.
By knowing all causation trees, By knowing all causation trees,
the statistical probabilities (from base component data) for all causes can be simply added. the statistical probabilities (from base component data) for all causes can be simply added.
\item A graphical representation based on Euler diagrams is used. \item A graphical representation based on Euler diagrams is used. Providing an interface that does not involve
formal mathematical notation. This is intended to be user friendly and to guide the user through the FMMD process
while applying automatic checks for unhandled conditions.
\item From the top down the failure mode model will follow a logical de-composition of the functionality; by \item From the top down the failure mode model will follow a logical de-composition of the functionality; by
chosing {\fg}s and working bottom-up this hierarchical trait will occur as a natural consequence. chosing {\fg}s and working bottom-up this hierarchical trait will occur as a natural consequence.
\item Undetectable or unhandled failure modes will be specifically flagged. \item Undetectable or unhandled failure modes will be specifically flagged.
@ -781,5 +783,6 @@ chosing {\fg}s and working bottom-up this hierarchical trait will occur as a nat
This paper provides the background for the need for a new methodology for This paper provides the background for the need for a new methodology for
static analysis that can span the mechanical electrical and software domains static analysis that can span the mechanical electrical and software domains
using a common notation. using a common notation.
The author believes it addresses mant short comings in current static failure mode analysis methodologies.
\vspace{60pt} \vspace{60pt}
\today \today