106 lines
3.0 KiB
TeX
106 lines
3.0 KiB
TeX
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\ifthenelse {\boolean{paper}}
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{
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\abstract{
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This paper describes how the FMMD methodology
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can be applied throughout the lifecycle of a product,
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with minimal impact to the cost of re-analysis.
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% what I did
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Looking at SYSTEMS ENGINEERING concepts.
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FMMD static design analysis tool, but can be applied to product life cycle
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Becomes a living analysis tool
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% what I found
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Alterations required in a failure mode model arise from
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new failure modes discovered in base components, new failure mode behaviour observed
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in {\dc}s, and environmantal effects found that interact with the failure mode model.
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% conclusion
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FMMD analysis can be updated with these three effects
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and we can apply procedures that will automaically force
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the uncoverig of new possible SYSTEM failure modes.
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}
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}
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{
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This chapter describes how the FMMD methodology
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can be applied throughout the lifecycle of a product,
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with minimal impact to the cost of re-analysis.
|
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% what I did
|
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Looking at SYSTEMS ENGINEERING concepts.
|
|
FMMD static design analysis tool, but can be applied to product life cycle
|
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Becomes a living analysis tool
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% what I found
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Alterations required in a failure mode model arise from
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new failure modes discovered in base components, new failure mode behaviour observed
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in {\dc}s, and environmantal effects found that interact with the failure mode model.
|
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% conclusion
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FMMD analysis can be updated with these three effects
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and we can apply procedures that will automaically force
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the uncoverig of new possible SYSTEM failure modes.
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}
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\section{Introduction}
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\ifthenelse {\boolean{paper}}
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{
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paper
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THIS IS THE PAPER VERSION OF THE CHAPTER
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QUICK DESCRIPTION OF FMMD
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}
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{
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chapter
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THIS IS THE CHAPTER IN THESIS VERSION OF THE CHAPTER
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}
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\section{Three sources of Alteration/addition to the FMMD Model}
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\subsection{discovering a `new' failure mode in a component}
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Give general idea of how a new failure mode can be integrated into the model.
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How it may cause a new symptom but may not.
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How it will generally be limited to small sections of th FMMD tree.
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Give specific example, pretend a new failure mode is discovered in a SCHOTTKY diode.
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Often an electronic component will have a new failure mode `discovered'
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I am using as an example a diode which has an exponential relationship
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with temperature and reverse leakage current. This is
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a failure mode that would not be initially considered in a design.
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But when combined with high value resistors could give incorrect voltage readings in some circuits.
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I how the FMMD model can have this new failure mode added and what
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impact it has on the FMMD data model.
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\subsection{Discovering New Failure Mode behaviour in a {\dc}}
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Ref Nacy Leveson, system eng.
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A sub-system or system has its own behaviour etc
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These may be traced to combinations of afailure modes
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but may be undiscovered in initial analysis.
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\subsection{New or additional evironmental Conditions}
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An environmental effect may be found to affect a sub-system.
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Show how this vcan be retro fitted into a working/live FMMD model.
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\section{Conclusion}
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Product Life cycle phases for FMMD
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