Sunday afternoon

After meeting (Dave?} at methodist church talking about
resistor failure modes with him.

mybib.bib

@@ -274,7 +274,7 @@
 
 @MISC{en161,
   author =       "E N Standard",
-  title =        "EN161:2007 Automatic shutoff valves for gas burners and gas appliances"
+  title =        "EN161:2007 Automatic shutoff valves for gas burners and gas appliances",
  howpublished = "British standards Institution http://www.bsigroup.com/",
   year =         "2003"
 }

nr/.gitignore

@@ -0,0 +1,15 @@
+#
+#
+#
+# git ignore for latex
+#
+
+*.aux
+*.log
+*.dvi
+*.pdf
+*.lof
+*.lot
+*.toc
+*.*~
+

nr/Makefile

@@ -0,0 +1,22 @@
+
+#
+# Make the propositional logic diagram a paper
+#
+
+
+paper:	paper.tex nr_paper.tex
+	#latex paper.tex
+	#dvipdf paper     pdflatex cannot use eps ffs
+	pdflatex paper.tex
+	mv paper.pdf nr_paper.pdf
+	okular nr_paper.pdf
+
+
+# Remove the need for referncing graphics in subdirectories
+#
+nr_paper.tex: nr.tex
+	cat nr.tex | sed 's/nr\///' > nr_paper.tex
+
+
+bib:
+	bibtex paper

nr/nr.tex

@@ -0,0 +1,72 @@
+%
+% Make the revision and doc number macro's then they are defined in one place
+\ifthenelse {\boolean{paper}}
+{
+\begin{abstract}
+
+\end{abstract}
+}
+{
+\section{Overview}
+Component failure modes are documented for most generic
+components~\cite{mil1992}~\cite{rac}. There are some differences in 
+the failure modes that we are required to consider for various 
+safety standards.
+For an example of this we can look in detail at one particular 
+type
+ of component, and examine potential causes of failure modes and 
+and how various standards demands  in terms of  possible failure modes.
+For this study the common resistor ahs been chosen.
+}
+
+
+
+\section{Resistor Failure Modes}
+
+
+Most common failure OPEN
+
+ENXXX ays only consider OPEN
+
+EN298 considers OPEN and SHORT
+
+
+\subsection{Physical causes for a resristor short}
+
+* over heating causing a solder bridge
+
+* over heating causing the component to melt and short (wirewound)
+\subsection{Physical causes for a resristor open}
+* Over current causing the component to burn out (acting like a fuse).
+
+* vacuum conditions can cause solder joints to sublime (space ref jbis)
+
+\subsection{Physical causes for a resristor parameter change}
+*the resistor can react to over heating by becoming
+damaged so that the resistance track is internally shorted, making the 
+part read a lower resistance
+
+*the resistor can over heat and the resistance track and be made thinner leading to a higher resistance
+
+*chemical attack could alter the properties of the resistance track.
+
+*RAC give parameter change as well
+this means that the resistor may change its resistance value
+as a failure mode.
+
+
+\section{Properties of a resistor network}
+
+RAC gives a resistor network 
+ as having only failure modes of 
+OPEN and SHORT.
+
+Let us consider a simple resistoir network.
+
+Examine all causes.
+Assume resistors not from same batch.
+
+Show how parameter change is cancelled out, use sum of squares statistics
+to show by how much.
+
+

nr/paper.tex

@@ -0,0 +1,34 @@
+
+\documentclass[a4paper,10pt]{article}
+\usepackage{graphicx}
+\usepackage{fancyhdr}
+\usepackage{tikz}
+\usepackage{amsfonts,amsmath,amsthm}
+
+\usepackage{ifthen}
+\newboolean{paper}
+\setboolean{paper}{true} % boolvar=true or false
+
+
+
+\input{../style}
+
+%\newtheorem{definition}{Definition:}
+
+\begin{document}
+\pagestyle{fancy}
+
+%\outerhead{{\small\bf PT100 FMMD analysis}}         
+%\innerfoot{{\small\bf R.P. Clark } }   
+                                              % numbers at outer edges
+\pagenumbering{arabic}                        % Arabic page numbers hereafter
+\author{R.P.Clark}
+\title{Resistir Failure Modes in detail, leading to a networked resistor derived component}
+\maketitle 
+\input{nr_paper}
+
+\bibliographystyle{plain}
+\bibliography{../vmgbibliography,../mybib}
+
+\today
+\end{document}

thesis.tex

@@ -130,6 +130,10 @@
 \chapter {Symptom Extraction using PLD Diagrams }
 \input{symptom_abstraction/symptom_abstraction}
 
+\typeout{ ---------------- Networked resistor }
+\chapter {Example component with its failure modes in detail}
+\input{nr/nr}
+
 
 \chapter{FMMD functional~group to \\derived component example : PT100 4 wire Temperature Sensor}
 \typeout{ ---------------- pt100}