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@ -6,7 +6,8 @@ paper: paper.tex fmmd_concept_paper.tex
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#latex paper.tex
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#latex paper.tex
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#dvipdf paper pdflatex cannot use eps ffs
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#dvipdf paper pdflatex cannot use eps ffs
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pdflatex paper.tex
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pdflatex paper.tex
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okular paper.pdf
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cp paper.pdf fmmd_concept_paper.pdf
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okular fmmd_concept_paper.pdf
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# Remove the need for referncing graphics in subdirectories
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# Remove the need for referncing graphics in subdirectories
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@ -4,24 +4,66 @@
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\ifthenelse {\boolean{paper}}
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\ifthenelse {\boolean{paper}}
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{
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{
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\abstract{ This paper proposes a methodology for
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\abstract{
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This paper proposes a methodology for
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creating failure mode models of safety critical systems, which
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creating failure mode models of safety critical systems, which
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has a common and integrateable notation
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has a common and integrateable notation
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for mechanical, electronic and software domains.
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for mechanical, electronic and software domains.
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%% What I have done
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%% What I have done
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%%
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%%
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The Four main static failure mode analysis methodologies were examined and
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in in the context of newer European safety standards assessed.
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Some of the defeciencies in these methodologies lead to
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a wish list for a more ideal methodology.
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%% What I have found
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%% What I have found
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%%
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%%
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In addition, the methodology address the traditional weaknesses of
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From the wishlist and considering some constraints determined from
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the evaluation of the four established methodologies, a new
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methodology is developed. The has been named Failure Mode Modular De-Composition (FMMD).
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%% Sell it
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%%
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In addition, FMMD to addressing the traditional weaknesses of
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Fault Tree Analysis (FTA), Fault Mode Effects Analysis (FMEA), Faliue Mode Effects Criticallity Analysis (FMECA)
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Fault Tree Analysis (FTA), Fault Mode Effects Analysis (FMEA), Faliue Mode Effects Criticallity Analysis (FMECA)
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and Failure Mode Effects and Diagnostic Analysis (FMEDA).
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and Failure Mode Effects and Diagnostic Analysis (FMEDA), FMMD provides the means to model multiple failure mode scenarios
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as specified in newer European Safety Standards \cite{en298}.
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The proposed methodology is bottom-up and
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The proposed methodology is bottom-up and
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modular.}
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modular, meaning that the results of analysed components amy be re-used in other projects.}
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}
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{
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This chapter proposes a methodology for
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creating failure mode models of safety critical systems, which
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has a common and integrateable notation
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for mechanical, electronic and software domains.
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%% What I have done
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%%
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The Four main static failure mode analysis methodologies were examined and
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in in the context of newer European safety standards assessed.
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Some of the defeciencies in these methodologies lead to
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a wish list for a more ideal methodology.
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%% What I have found
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%%
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From the wishlist and considering some constraints determined from
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the evaluation of the four established methodologies, a new
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methodology is developed. The has been named Failure Mode Modular De-Composition (FMMD).
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%% Sell it
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%%
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In addition, FMMD to addressing the traditional weaknesses of
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Fault Tree Analysis (FTA), Fault Mode Effects Analysis (FMEA), Faliue Mode Effects Criticallity Analysis (FMECA)
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and Failure Mode Effects and Diagnostic Analysis (FMEDA), FMMD provides the means to model multiple failure mode scenarios
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as specified in newer European Safety Standards \cite{en298}.
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The proposed methodology is bottom-up and
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modular, meaning that the results of analysed components amy be re-used in other projects.
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}
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}
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{}
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\section{Introduction}
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\section{Current Static Failure mode Methodologies}
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There are four methodologies in common use for failure mode modelling.
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There are four methodologies in common use for failure mode modelling.
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These are FTA, FMEA, FMECA
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These are FTA, FMEA, FMECA
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@ -321,7 +363,7 @@ that converges to a finite set of SYSTEM level failure modes.
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What would be better would be to analyse the failure mode behaviour in each
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What would be better would be to analyse the failure mode behaviour in each
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functional group, and determine the ways in which it, rather than its
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functional group, and determine the ways in which it, rather than its
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components can fail.
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components can fail.
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\paragraph{Compinent failures and {\fg} failure symptoms}
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\paragraph{Component failures and {\fg} failure symptoms}
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In other words we want to find out what the symptoms of the failures in the {\fg}s
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In other words we want to find out what the symptoms of the failures in the {\fg}s
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are.
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are.
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The number of symptoms of failure should be equal to or
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The number of symptoms of failure should be equal to or
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@ -374,7 +416,7 @@ there are generally only a handful of SYSTEM level failure modes.
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%
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%
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\subsection{Outline of the FMMD process}
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\subsection{Outline of the FMMD process}
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\label{fmmdproc}
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FMMD builds {\fg}s of components from the bottom-up.
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FMMD builds {\fg}s of components from the bottom-up.
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Thus the {\fg}s are minimal collections of components
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Thus the {\fg}s are minimal collections of components
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that work together to perform a simple function.
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that work together to perform a simple function.
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@ -391,8 +433,18 @@ modes, the collected symptoms of the {\fg}.
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Because we can now have a {\dcs} we can use these to form
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Because we can now have a {\dcs} we can use these to form
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new {\fg}s and we can build a hierarchical model of the system failure modes.
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new {\fg}s and we can build a hierarchical model of the system failure modes.
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%%- Need diagram of hierarchy
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%%-
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%%-
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\vspace{20pt}
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NEED DIAGRAM OF HIERACY
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\vspace{20pt}
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\subsection{Justification of wishlist}
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\subsection{Justification of wishlist}
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By applying the methodology in section \ref{fmmdproc}, the wishlist can
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now be evaluated for the proposed FMMD methodology.
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\subsubsection{All component failure modes must be considered in the model.}
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\subsubsection{All component failure modes must be considered in the model.}
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The proposed methodology will be bottom-up.
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The proposed methodology will be bottom-up.
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This ensures that all component failure modes are handled.
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This ensures that all component failure modes are handled.
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@ -20,7 +20,7 @@
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% numbers at outer edges
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% numbers at outer edges
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\pagenumbering{arabic} % Arabic page numbers hereafter
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\pagenumbering{arabic} % Arabic page numbers hereafter
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\author{R.P.Clark}
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\author{R.P.Clark}
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\title{FMMD: Developing A rigorous bottom-up modular failure mode modelling methodology}
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\title{Developing A rigorous bottom-up modular static failure mode modelling methodology}
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\maketitle
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\maketitle
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\input{fmmd_concept_paper}
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\input{fmmd_concept_paper}
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