



\ifthenelse {\boolean{paper}}
{
\abstract{ 
This paper describes how the FMMD methodology 
can be applied throughout the lifecycle of a product,
with minimal impact to the cost of re-analysis.
% what I did
Looking at SYSTEMS ENGINEERING concepts.
FMMD static design analysis tool, but can be applied to product life cycle
Becomes a living analysis tool
% what I found
 Alterations required in a failure mode model arise from
new failure modes discovered in base components, new failure mode behaviour observed
in {\dc}s, and environmantal effects found that interact with the failure mode model.
% conclusion
FMMD analysis can be updated with these three effects
and we can apply procedures that will automaically force
the uncoverig of new possible SYSTEM failure modes.
}
}
{
This chapter describes how the FMMD methodology 
can be applied throughout the lifecycle of a product,
with minimal impact to the cost of re-analysis.
% what I did
Looking at SYSTEMS ENGINEERING concepts.
FMMD static design analysis tool, but can be applied to product life cycle
Becomes a living analysis tool
% what I found
 Alterations required in a failure mode model arise from
new failure modes discovered in base components, new failure mode behaviour observed
in {\dc}s, and environmantal effects found that interact with the failure mode model.
% conclusion
FMMD analysis can be updated with these three effects
and we can apply procedures that will automaically force
the uncoverig of new possible SYSTEM failure modes.
}

 
\section{Introduction}

\ifthenelse {\boolean{paper}}
{
paper

THIS IS THE PAPER VERSION OF THE CHAPTER

QUICK DESCRIPTION OF FMMD

}
{
chapter
THIS IS THE CHAPTER IN THESIS VERSION OF THE CHAPTER
}

\section{Three sources of Alteration/addition to the FMMD Model}


\subsection{discovering a `new' failure mode in a component}

Give general idea of how a new failure mode can be integrated into the model.

How it may cause a new symptom but may not.

How it will generally be limited to small sections of th FMMD tree.


Give specific example, pretend a new failure mode is discovered in a SCHOTTKY diode.

Often an electronic component will have a new failure mode `discovered'
I am using as an example a diode which has an exponential relationship
with temperature and reverse leakage current. This is
a failure mode that would not be initially considered in a design.
But when combined with high value resistors could give incorrect voltage readings in some circuits.
I how the FMMD model can have this new failure mode added and what
impact it has on the FMMD data model.

\subsection{Discovering New Failure Mode behaviour in a {\dc}}

Ref Nacy Leveson, system eng.

A sub-system or system has its own behaviour etc

These may be traced to combinations of afailure modes
but may be undiscovered in initial analysis.


\subsection{New or additional evironmental Conditions}



An environmental effect may be found to affect a sub-system.
Show how this vcan be retro fitted into a working/live FMMD model.

\section{Conclusion}

Product Life cycle phases for FMMD




