Morning edit

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Robin Clark 2010-10-21 09:28:51 +01:00
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@ -6,7 +6,8 @@ paper: paper.tex fmmd_concept_paper.tex
#latex paper.tex #latex paper.tex
#dvipdf paper pdflatex cannot use eps ffs #dvipdf paper pdflatex cannot use eps ffs
pdflatex paper.tex pdflatex paper.tex
okular paper.pdf cp paper.pdf fmmd_concept_paper.pdf
okular fmmd_concept_paper.pdf
# Remove the need for referncing graphics in subdirectories # Remove the need for referncing graphics in subdirectories

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@ -4,24 +4,66 @@
\ifthenelse {\boolean{paper}} \ifthenelse {\boolean{paper}}
{ {
\abstract{ This paper proposes a methodology for \abstract{
This paper proposes a methodology for
creating failure mode models of safety critical systems, which creating failure mode models of safety critical systems, which
has a common and integrateable notation has a common and integrateable notation
for mechanical, electronic and software domains. for mechanical, electronic and software domains.
%% What I have done %% What I have done
%% %%
The Four main static failure mode analysis methodologies were examined and
in in the context of newer European safety standards assessed.
Some of the defeciencies in these methodologies lead to
a wish list for a more ideal methodology.
%% What I have found %% What I have found
%% %%
In addition, the methodology address the traditional weaknesses of From the wishlist and considering some constraints determined from
the evaluation of the four established methodologies, a new
methodology is developed. The has been named Failure Mode Modular De-Composition (FMMD).
%% Sell it
%%
In addition, FMMD to addressing the traditional weaknesses of
Fault Tree Analysis (FTA), Fault Mode Effects Analysis (FMEA), Faliue Mode Effects Criticallity Analysis (FMECA) Fault Tree Analysis (FTA), Fault Mode Effects Analysis (FMEA), Faliue Mode Effects Criticallity Analysis (FMECA)
and Failure Mode Effects and Diagnostic Analysis (FMEDA). and Failure Mode Effects and Diagnostic Analysis (FMEDA), FMMD provides the means to model multiple failure mode scenarios
as specified in newer European Safety Standards \cite{en298}.
The proposed methodology is bottom-up and The proposed methodology is bottom-up and
modular.} modular, meaning that the results of analysed components amy be re-used in other projects.}
}
{
This chapter proposes a methodology for
creating failure mode models of safety critical systems, which
has a common and integrateable notation
for mechanical, electronic and software domains.
%% What I have done
%%
The Four main static failure mode analysis methodologies were examined and
in in the context of newer European safety standards assessed.
Some of the defeciencies in these methodologies lead to
a wish list for a more ideal methodology.
%% What I have found
%%
From the wishlist and considering some constraints determined from
the evaluation of the four established methodologies, a new
methodology is developed. The has been named Failure Mode Modular De-Composition (FMMD).
%% Sell it
%%
In addition, FMMD to addressing the traditional weaknesses of
Fault Tree Analysis (FTA), Fault Mode Effects Analysis (FMEA), Faliue Mode Effects Criticallity Analysis (FMECA)
and Failure Mode Effects and Diagnostic Analysis (FMEDA), FMMD provides the means to model multiple failure mode scenarios
as specified in newer European Safety Standards \cite{en298}.
The proposed methodology is bottom-up and
modular, meaning that the results of analysed components amy be re-used in other projects.
} }
{}
\section{Introduction}
\section{Current Static Failure mode Methodologies}
There are four methodologies in common use for failure mode modelling. There are four methodologies in common use for failure mode modelling.
These are FTA, FMEA, FMECA These are FTA, FMEA, FMECA
@ -321,7 +363,7 @@ that converges to a finite set of SYSTEM level failure modes.
What would be better would be to analyse the failure mode behaviour in each What would be better would be to analyse the failure mode behaviour in each
functional group, and determine the ways in which it, rather than its functional group, and determine the ways in which it, rather than its
components can fail. components can fail.
\paragraph{Compinent failures and {\fg} failure symptoms} \paragraph{Component failures and {\fg} failure symptoms}
In other words we want to find out what the symptoms of the failures in the {\fg}s In other words we want to find out what the symptoms of the failures in the {\fg}s
are. are.
The number of symptoms of failure should be equal to or The number of symptoms of failure should be equal to or
@ -374,7 +416,7 @@ there are generally only a handful of SYSTEM level failure modes.
% %
\subsection{Outline of the FMMD process} \subsection{Outline of the FMMD process}
\label{fmmdproc}
FMMD builds {\fg}s of components from the bottom-up. FMMD builds {\fg}s of components from the bottom-up.
Thus the {\fg}s are minimal collections of components Thus the {\fg}s are minimal collections of components
that work together to perform a simple function. that work together to perform a simple function.
@ -391,8 +433,18 @@ modes, the collected symptoms of the {\fg}.
Because we can now have a {\dcs} we can use these to form Because we can now have a {\dcs} we can use these to form
new {\fg}s and we can build a hierarchical model of the system failure modes. new {\fg}s and we can build a hierarchical model of the system failure modes.
%%- Need diagram of hierarchy
%%-
%%-
\vspace{20pt}
NEED DIAGRAM OF HIERACY
\vspace{20pt}
\subsection{Justification of wishlist} \subsection{Justification of wishlist}
By applying the methodology in section \ref{fmmdproc}, the wishlist can
now be evaluated for the proposed FMMD methodology.
\subsubsection{All component failure modes must be considered in the model.} \subsubsection{All component failure modes must be considered in the model.}
The proposed methodology will be bottom-up. The proposed methodology will be bottom-up.
This ensures that all component failure modes are handled. This ensures that all component failure modes are handled.

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@ -20,7 +20,7 @@
% numbers at outer edges % numbers at outer edges
\pagenumbering{arabic} % Arabic page numbers hereafter \pagenumbering{arabic} % Arabic page numbers hereafter
\author{R.P.Clark} \author{R.P.Clark}
\title{FMMD: Developing A rigorous bottom-up modular failure mode modelling methodology} \title{Developing A rigorous bottom-up modular static failure mode modelling methodology}
\maketitle \maketitle
\input{fmmd_concept_paper} \input{fmmd_concept_paper}