diff --git a/fmmd_concept/System_safety_2011/submission.tex b/fmmd_concept/System_safety_2011/submission.tex index add52b9..19d04be 100644 --- a/fmmd_concept/System_safety_2011/submission.tex +++ b/fmmd_concept/System_safety_2011/submission.tex @@ -54,8 +54,8 @@ failure mode of the component or sub-system}}} %\innerfoot{{\small\bf R.P. Clark } } % numbers at outer edges \pagenumbering{arabic} % Arabic page numbers hereafter -\author{R.P.Clark$^1$ , Andrew~Fish$^2$ , John~Howse$^2$ , Chris Garret$^2$ \\ - $^1${\em Energy Technology Control, Lewes,UK} \and $^2${\em University of Brighton, UK} +\author{R.P.Clark$^\star$ , Andrew~Fish$^\dagger$ , John~Howse$^\dagger$ , Chris Garret$^\dagger$ \\ + $^\star${\em Energy Technology Control, Lewes,UK} \and $^\dagger${\em University of Brighton, UK} } \title{Developing a rigorous bottom-up modular static failure mode modelling methodology} @@ -172,8 +172,8 @@ is $N \times K$. To examine the effect that one failure mode has on all the other components\footnote{A base component failure will typically affect the sub-system it is part of, and create a failure effect at the SYSTEM level.} will be $(N-1) \times N \times K$, in effect a very large set cross product. -If $E$ is the number of applied states or environmental conditions to consider -in a system, and $A$ the number of applied states, +If $E$ is the number of environmental conditions to consider +in a system, and $A$ the number of applied states (or modes of the SYSTEM), the job of the bottom-up analyst is presented with two additional %cross product factors, @@ -194,12 +194,12 @@ The `reasoning~distance' $R_D$ can be calculated by summing the number of compon involved, multiplied by the number of failure modes in each component, that must interact to reach the top level event. Where $C$ represents the set of components in a failure mode causation chain, -$c$ represents a component and -the function $fn$ returns the number of failure modes for a given component, equation +$c_i$ represents a component in $C$ and +the function $fm$ returns the failure modes for a given component, equation \ref{eqn:complexity}, returns a value representing the complexity from the base component failure to the SYSTEM level event. \begin{equation} -R_D = \sum_{i=1}^{|C|} {fn(c)} %\; where \; c \in C +R_D = \sum_{i=1}^{|C|} |{fm(c_i)}| %\; where \; c \in C \label{eqn:complexity} \end{equation} @@ -237,7 +237,9 @@ base our reasoning on, at each stage. -Development of the new methodology +%Development of the new methodology + +\section{An ontology of failure modes} An ontology is developed of failure modes and their relationship to environmental factors, @@ -291,9 +293,10 @@ mechanical and software elements in one integrated model. % - +{ \tiny \bibliographystyle{plain} -\bibliography{../vmgbibliography,../mybib} +\bibliography{vmgbibliography,mybib} +} \today \end{document}