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found nice definition for `part' in spacecraft systems engineering.

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Robin Clark 2012-01-11 20:07:20 +00:00
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18
component_failure_modes_definition/component_failure_modes_definition.tex
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@ -75,11 +75,21 @@ Let us first define a component.
This is anything we use to build a product or system. This is anything we use to build a product or system.
It could be something quite complicated It could be something quite complicated
like an integrated microcontroller, or quite simple like the humble resistor. like an integrated microcontroller, or quite simple like the humble resistor.
We can define a We can define a
component by its name, a manufacturers' part number and perhaps component by its name, a manufacturers' part number and perhaps
a vendors' reference number. a vendors' reference number.
What these components all have in common is that they can fail, and fail in
a number of well defined ways. For common components Geffory Hall, writing in Spacecraft systems engineering\cite{scse}[p.619]
defines a `part' thus
``{\em {Part(definition)}---The lowest level of assembly, beyond which further diss-assembly irrevocably destroys the item''
The term component, in American English, can mean a building block or a part.
In British-English a component generally is given to mean the definition for part above.
For this study, we will use base-component to mean a `part', and component
to mean a part or sub-assembly.
What components all have in common is that they can fail, and fail in
a number of well defined ways. For common base-components
there is established literature for the failure modes for the system designer to consider (often with accompanying statistical there is established literature for the failure modes for the system designer to consider (often with accompanying statistical
failure rates)~\cite{mil1991}. For instance, a simple resistor is generally considered failure rates)~\cite{mil1991}. For instance, a simple resistor is generally considered
to fail in two ways, it can go open circuit or it can short. to fail in two ways, it can go open circuit or it can short.
@ -101,8 +111,8 @@ each failure mode is referenced back to only one component.
%%-%% The lower resistance part will draw more current and therefore have a statistically higher chance of failure.}. %%-%% The lower resistance part will draw more current and therefore have a statistically higher chance of failure.}.
A product naturally consists of many components and these are traditionally A products are built using of many base-components and these are traditionally
kept in a `parts list'. For a safety critical product this is usually a formal document kept in a `parts~list'. For a safety critical product this is usually a formal document
and is used by quality inspectors to ensure the correct parts are being fitted. and is used by quality inspectors to ensure the correct parts are being fitted.
The parts list is shown for The parts list is shown for
completeness here, as people involved with Printed Circuit Board (PCB) and electronics production, verification completeness here, as people involved with Printed Circuit Board (PCB) and electronics production, verification

7
mybib.bib
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@ -135,6 +135,13 @@
YEAR = "2005" YEAR = "2005"
} }
@BOOK{scse,
AUTHOR = "Fortescue, Swinerd, Stark",
TITLE = "Spacecraft Systems Engineering ISBN:978-0-470-75012-4",
PUBLISHER = "Wiley",
YEAR = "2011"
}
@BOOK{bfmea, @BOOK{bfmea,
AUTHOR = "Robin E McDermot et all", AUTHOR = "Robin E McDermot et all",
TITLE = "The Basics of FMEA ISBN: 0-527-76320-9", TITLE = "The Basics of FMEA ISBN: 0-527-76320-9",

6
thesis.tex
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@ -205,9 +205,9 @@ for incorrect temperature.
reference the MSC document and describe the Java extension classes. reference the MSC document and describe the Java extension classes.
Software documentation for fmmd tool. Software documentation for fmmd tool.
\typeout{ ---------------- Euler Diagrams represented as graphs} %\typeout{ ---------------- Euler Diagrams represented as graphs}
\chapter {Euler Diagrams \\ Represented as graphs} %\chapter {Euler Diagrams \\ Represented as graphs}
\input{eulerg/eulerg} %\input{eulerg/eulerg}
\chapter{Fast Zone Discrimination Algorithm} \chapter{Fast Zone Discrimination Algorithm}
\input{fzd/fzd} \input{fzd/fzd}