From c5d4e340e85d70b69c6dea12fa769e1d019f983d Mon Sep 17 00:00:00 2001 From: Robin Clark Date: Thu, 21 Oct 2010 09:28:51 +0100 Subject: [PATCH] Morning edit --- fmmd_concept/Makefile | 3 +- fmmd_concept/fmmd_concept.tex | 68 ++++++++++++++++++++++++++++++----- fmmd_concept/paper.tex | 2 +- 3 files changed, 63 insertions(+), 10 deletions(-) diff --git a/fmmd_concept/Makefile b/fmmd_concept/Makefile index 054af3e..e2c48e4 100644 --- a/fmmd_concept/Makefile +++ b/fmmd_concept/Makefile @@ -6,7 +6,8 @@ paper: paper.tex fmmd_concept_paper.tex #latex paper.tex #dvipdf paper pdflatex cannot use eps ffs 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 diff --git a/fmmd_concept/fmmd_concept.tex b/fmmd_concept/fmmd_concept.tex index f5f0afe..39327ec 100644 --- a/fmmd_concept/fmmd_concept.tex +++ b/fmmd_concept/fmmd_concept.tex @@ -4,24 +4,66 @@ \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 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 %% -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) -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 -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. 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 functional group, and determine the ways in which it, rather than its 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 are. 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} - +\label{fmmdproc} FMMD builds {\fg}s of components from the bottom-up. Thus the {\fg}s are minimal collections of components 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 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} +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.} The proposed methodology will be bottom-up. This ensures that all component failure modes are handled. diff --git a/fmmd_concept/paper.tex b/fmmd_concept/paper.tex index 53480fc..c06a78c 100644 --- a/fmmd_concept/paper.tex +++ b/fmmd_concept/paper.tex @@ -20,7 +20,7 @@ % numbers at outer edges \pagenumbering{arabic} % Arabic page numbers hereafter \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 \input{fmmd_concept_paper}