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Robin Clark 2010-12-07 09:15:14 +00:00
parent 7a018d5fdf
commit ec2f9470ec
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component_failure_modes_definition/component_failure_modes_definition.tex
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@ -754,11 +754,18 @@ Consider for instance an electrical circuit that has a TEST line.
When the TEST line is activated, it supplies a test signal When the TEST line is activated, it supplies a test signal
which will validate the circuit. This circuit will have two operational states, which will validate the circuit. This circuit will have two operational states,
NORMAL and TEST mode. NORMAL and TEST mode.
It is natural to apply the operational states to functional groups. It is natural to apply the operational states to functional groups.
Functional groups by definition implement functionality, or purpose Functional groups by definition implement functionality, or purpose
of particular sub-systems, and therefore are the best objects to model of particular sub-systems, and therefore are the best objects to model
operational states. operational states.
\paragraph{Inhibit Conditions}
Some failure modes may only be active given specific environmental conditions
or when other failures are already active.
To model this, an `inhibit' class has been added.
This is an optional atribute of
a failure mode. This inhibit class can be triggered
on a combination of environmental or failure modes.
\paragraph{UML Diagram Additional Objects.} \paragraph{UML Diagram Additional Objects.}
The additional objects System, Environment and Operational States The additional objects System, Environment and Operational States
@ -768,7 +775,7 @@ are added to UML diagram in figure \ref{fig:cfg} and represented in figure \ref
\begin{figure}[h] \begin{figure}[h]
\centering \centering
\includegraphics[width=400pt,keepaspectratio=true]{./component_failure_modes_definition/cfg2.jpg} \includegraphics[width=400pt,keepaspectratio=true]{./master_uml.jpg}
% cfg2.jpg: 702x464 pixel, 72dpi, 24.76x16.37 cm, bb=0 0 702 464 % cfg2.jpg: 702x464 pixel, 72dpi, 24.76x16.37 cm, bb=0 0 702 464
\caption{Complete UML diagram} \caption{Complete UML diagram}
\label{fig:cfg2} \label{fig:cfg2}