From 1b784c60902099b9124b64ccdc1c7980f8a8e148 Mon Sep 17 00:00:00 2001 From: Robin Clark Date: Sun, 21 Nov 2010 20:16:04 +0000 Subject: [PATCH] Notes from J Howse 19NOV2010 Meeting --- symptom_ex_process/introduction.tex | 6 ++---- symptom_ex_process/paper.tex | 10 ++++++++++ symptom_ex_process/top_down_de_comp.dia | Bin 1624 -> 1757 bytes symptom_ex_process/top_down_de_comp.jpg | Bin 19494 -> 23821 bytes symptom_ex_process/topbot.tex | 12 ++++++++---- 5 files changed, 20 insertions(+), 8 deletions(-) diff --git a/symptom_ex_process/introduction.tex b/symptom_ex_process/introduction.tex index 5a8e86c..34775a4 100644 --- a/symptom_ex_process/introduction.tex +++ b/symptom_ex_process/introduction.tex @@ -12,9 +12,7 @@ In the field of safety engineering this derived component corresponds to a low~ %The technique uses a graphical notation, based on Euler\cite{eulerviz} and Constraint diagrams\cite{constraint} to model failure modes and failure mode common symptom collection. The technique is designed for making building blocks for a hierarchical fault model. % Once the failure modes have been determined for a sub-system/{\dc}, -this {\dc} can be combined with others to form {\fgs} groups -to model -higher level sub-systems/{\dcs}. +this {\dc} can be combined with others to form {\fgs} to model higher level sub-systems/{\dcs}. % In this way a hierarchy to represent the fault behaviour of a system can be built from the bottom~up. This process can continue @@ -30,7 +28,7 @@ Once a hierarchy is in place, it can be converted into a fault data model. From the fault data model, automatic generation of FTA \cite{nasafta} (Fault Tree Analysis) and mimimal cuts sets \cite{nucfta} are possible. Also statistical reliability/probability of failure~on~demand \cite{en61508} and MTTF (Mean Time to Failure) calculations can be produced -automatically \footnote{Where component failure mode statistics are available \cite{mil1991}}. +automatically\footnote{Where component failure mode statistics are available \cite{mil1991}}. % This chapter focuses on the process of converting {\fgs} to {\dcs}, or building the `blocks' of the FMMD hierarchy. We can term this stage in FMMD analysis as the `symptom extraction' process. diff --git a/symptom_ex_process/paper.tex b/symptom_ex_process/paper.tex index 5fc4df1..9a2edf2 100644 --- a/symptom_ex_process/paper.tex +++ b/symptom_ex_process/paper.tex @@ -6,6 +6,7 @@ \usepackage{amsfonts,amsmath,amsthm} \usepackage{algorithm} \usepackage{algorithmic} +\usepackage{lastpage} \usepackage{ifthen} \newboolean{paper} \setboolean{paper}{true} % boolvar=true or false @@ -16,6 +17,15 @@ \begin{document} \pagestyle{fancy} +\fancyhf{} +%\renewcommand{\chaptermark}[1]{\markboth{ \emph{#1}}{}} +\fancyhead[LO]{} +\fancyhead[RE]{\leftmark} +%\fancyfoot[LE,RO]{\thepage} +\cfoot{Page \thepage\ of \pageref{LastPage}} +\rfoot{\today} +\lhead{The Symptom Extraction process of FMMD} + %\outerhead{{\small\bf Symptom Extraction Process}} %\innerfoot{{\small\bf R.P. 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b/symptom_ex_process/topbot.tex index 2928c2a..f5426ea 100644 --- a/symptom_ex_process/topbot.tex +++ b/symptom_ex_process/topbot.tex @@ -1,5 +1,5 @@ -\section{Fault Finding \\ and Failure Mode Analysis} +\section{Fault Finding and Failure Mode Analysis} \subsection{Static Analysis} @@ -23,7 +23,7 @@ can be derived. FMMD can model electrical, mechanical and software using a common notation, and can thus model an entire electro-mechanical software controlled system. -\subsection{Top Down or \\ natural trouble shooting} +\subsection{Top Down or natural trouble shooting} It is interesting here to look at the `natural' trouble shooting process. Fault finding is instinctively performed from the top-down. A faulty piece of equipment is examined and will have a @@ -49,6 +49,7 @@ Top down formal fault isolation/finding techniques for electronics are described %% %% insert diagram here + \begin{figure}[h] \centering \includegraphics[width=300pt,bb=0 0 587 445,keepaspectratio=true]{symptom_ex_process/top_down_de_comp.jpg} @@ -85,7 +86,10 @@ The effects on the functional group can then be collected as common symptoms, and now we may treat the functional group as a component, as it has a known set of failure modes. % By reusing the `components' derived from functional~groups an entire -hierarichal failure mode of the system can be built. +hierarichal failure mode model of the system can be built. +That is to say, using derived components in higher level functional groups +a hierarchy is naturally formed. +% By working from the bottom up, we can trace all possible sources that could cause a particular mode of equipment failure. This means that at the design stage of a product all component failure @@ -114,7 +118,7 @@ These are listed in table~\ref{tab:symexdef}. A system, is any coherent entity that would be sold as a product. % safety critical product. A sub-system is a system that is part of some larger system. -For instance a stereo amplifier separate is a sub-system. The +For instance a stereo amplifier separate/slave is a sub-system. The whole sound system, consists perhaps of the following `sub-systems': CD-player, tuner, amplifier~separate, loudspeakers and ipod~interface.