From 1af79848e9cc137c2a339f21dede680c4e3a7078 Mon Sep 17 00:00:00 2001 From: Robin Clark Date: Fri, 6 Sep 2013 18:48:10 +0100 Subject: [PATCH] OK CH2 needs all the 'we' and 'our' sentences re-written. Ballcocks. AND CH4, caryy on with AF comments. --- submission_thesis/CH3_FMEA_criticism/copy.tex | 27 +++++++++--------- .../CH4_FMMD/instance_diagram_NONINVAMP.dia | Bin 4673 -> 4672 bytes 2 files changed, 14 insertions(+), 13 deletions(-) diff --git a/submission_thesis/CH3_FMEA_criticism/copy.tex b/submission_thesis/CH3_FMEA_criticism/copy.tex index c3b4158..5954a05 100644 --- a/submission_thesis/CH3_FMEA_criticism/copy.tex +++ b/submission_thesis/CH3_FMEA_criticism/copy.tex @@ -21,12 +21,12 @@ our lives safer. This chapter aims to look for the deficiencies in current FMEA and look for ways in which it could be performed better and more efficiently. A major problem is with the scope of -examination---i.e. which/how~many components should we check against a particular failure mode---to +examination---i.e. which/how~many components should be checked against a particular failure mode---to apply for FMEA analysis. % -Checking all combinations quickly leads to a state explosion problem: -defining limits for the number of components to check for against a given {\bc} -{\fm} could address this. +Checking all possible combinations of {\fms} against all components quickly leads to a state explosion problem. %: +%defining limits for the number of components to check for against given {\bc} +%{\fms} could address this. % The difficulties of integrating software and hardware in FMEA failure models mean that FMEA is showing its age: designed @@ -63,7 +63,7 @@ traceable reasoning) FMEA models are presented. Finally we conclude with a list of deficiencies in current FMEA methodologies and present a wish list for an improved methodology. -\section{Historical Origins of FMEA: {\bc} {\fm} to system level failure/symptom paradigm} +\section{Historical Origins of FMEA and the {\bc} {\fm} to system level failure/symptom paradigm} \subsection{FMEA: {\bc} {\fm} to system level failure modelling} FMEA traces it roots to the 1940s when it was used to identify the most costly @@ -145,12 +145,12 @@ This can be seen as an indicator of the lack of cause to effect precision possible when analysing large systems using FMEA. % -Ideally this relationship would be one to one. +Ideally this relationship would be many ({\bc} {\fms}) to one (system level symptoms). % This would be beneficial in terms of validating precision of analysis, and for by-products of -the process such as developing diagnostic fault trees from -FMEA analyses. +the process such as developing diagnostic fault trees~\cite{cbds}[Ch 6.2] from +FMEA results. \section{Comparison Complexity} %\section{Reasoning Distance used to measure Comparison Complexity} @@ -177,16 +177,17 @@ other system level symptoms. % Were we to compare the reasoning distance with the theoretical maximum, the sum of all failure % modes in a system, multiplied by the number of components in it, we could arrive at a maximum % reasoning distance, which we can use as a comparison complexity figure. -If the reasoning distance is compared with the theoretical maximum, i.e. -as defined in equation~\ref{eqn:fmea_single}, this can be used as a comparison complexity figure. +If a reasoning distance used is compared with the theoretical maximum, i.e. +as defined in equation~\ref{eqn:fmea_single}, + comparison complexity figures can be produced. % % This figure would mean we could compare the maximum number of checks (i.e. exhaustive %rigorous % analysis) with the number actually performed. -This figure would mean this maximum number of checks (i.e. exhaustive %rigorous +Comlexity comparision means this maximum number of checks (i.e. exhaustive %rigorous analysis) could be compared to the number actually performed. % -In effect a yard~stick for the efficiency, in terms of work, -for a particular analysis technique. +In effect a yard~stick for the amount of work performed +for a particular FMEA analysis technique/strategy. \paragraph{The ideal of exhaustive FMEA (XFMEA).} % diff --git a/submission_thesis/CH4_FMMD/instance_diagram_NONINVAMP.dia b/submission_thesis/CH4_FMMD/instance_diagram_NONINVAMP.dia index d358fd3c06cc5f425ac27687b5a6e6a92350592d..519f56ee68cebb41d42c1c0c4054f56117997542 100644 GIT binary patch literal 4672 zcmV-G62I*qiwFP!000021MOYgavL`iefL+elvf7A{SwAbImsqYl@q(-WcSfElEyMO z6saO9%X-;wUo=2l7tUA|0g#5Oor;T;N7Dnc&*=-g8{hx%@oX~q(9Rd*+4SiFBlKX< zPLF3NQNm*?Ld9$sEvlF8Mg zS-_V9nrWYQe^iw+N-JsAvc-r%HJHt@66Pn+d(K0dlwwu5PN);>KrYL5Ro zozE_&CkOGW)pf_S$!tFO&`h2leDf~+IXGP1=J3{izHsmJ=CnPUx6MEOx2FD&bKBhd zyq({@?b-QkG4_`%ug=#l>A4U5edC(dRSSR7^z_*`&*eAqkybyrzE{_S_6k{^HS^Q) zbX|`BY$ox8;KXvy{fD8Pb<{}1K7A$+7k9Kb**(wyu9+-0SwQ^pXS6*Oxu^5-$(Mn9>x!Pc zT#iqc@85nb^l`b^9N$&GcaP1+N%q z&>SzvA3nXi@tMqy{@WfeSBrhKY^Ep8{ABR$;K$j=gKHnedm!VJrw6a-?GNkj^8C#_ z53YS$=d){-62z$?W5lStAHq6?^ock+x+`Js*U(H)C+)SAAY{ZWyplw3C#{{dXK#;Z z^Xa;ekaJN%OrVqXg?*wDNgTcPM<&R6-;Ph;FZ+dYV%*I?)@>*3Xf{7-=WlQ0w*$ef zf&aFXv3NhbeB0rm-fw-ond0yo7F*+l<-my>8e(W^oJcQ4D;1C;hl~=XRB5mztqj5P z$iTvLfJF|uSKYE$u?~dDfE9Qxh$s$~lyxCe9vM7+Z7SS&}dlv8%G2! zj+V5wAzrG*%U|usjQouGsZ)@PjTDXm6DucaU(ffNZ+ zJRu1NuYC+h%O+iuSB5#)$Ch(-$!M`erR_v-2A3el5vNC=B^p{oJb`w*wB7DjLA2dF zwcVdTsOi)r*K^Eb4PT%BW$@m!(n>#>Pid*%@~OPO9iQKQ zn64Vvhun1HzyG|pJ%^f$wGXr7ciHN9*`6T6azI2<0|l4VI$jth!i7>&%AE@+p_GAN zt&L(kKuPC1JAq;yR9W~3W6B~>Hn#`&1BLDhD9LqkTzQg*niwCSaa!7(7#TA1LWq$U z?4%BIjW(rW(znWPdm<w?P3=`3Dn@8bnG~r0~K>>1j%k8Gzyf%hR%%8PLTWJTPl;O47p6 zZo)sdO?WOcBz&10dL5Rf6TV&ycLeI`9g*Iu3n+1~V?@F8-(RC4-$BZ^Lle=CS7^tR zi|M2yF|SjSle`carHqs$45H(rqp(vKwTbzL-n^R@l`=HnU$OaC8GvHq{IRk?F`&54 zd%KDgCP1R0HO%t(xt)(cv?qg~;Qmw3)M&>`+wm@yL@QolH3`=lx)C)@5hy&_17wI8 zi3?^zc^j*OosgAw7hSBYB9c;#q+~LXQrzD%g=r~DVUd_%8Y8@QNK8mf_o^dOQ;pP= zV-}hakR>f#efvoaV?a$*dTQdeRNo>s?UI^0)DgMqYv!iDS}B(y(*$k!a9|+i+olya zOE(FkopF#ua14q-6j7A%AlWcoxK^rnogJ47Vx$YB-W^V0S}&F2DRTgr-A}2MNUkcB zh6r%>w?0{OGn9Om0+RrwB|KE#O7BP35MjLj8SQuROl+4TqWP{cv=Hfsrb?m|jI3cr zXI(`pVR#`NZl}T&cu_^p<6SeJT+G|S+3ci6ZYn} zE}pungqNok@)GjWy}F33R3j^i46MX$m>Nq96H^pJ84#1;u|&)uGa)l=ppQsSHIkFe zKu*HIk$+5=vtr zNOE|?6S|l-9N3b)HtfNxwurw6Fv(T2Qo=TSIKH>!eo=HEz4_K7>EN}83oqO7lDaSi z%VXo8}&=zN@&6qxB3 zsy<9mKZ(?Y)U=5{A~)5@P3a>c9bsXdt|%LmM=_q2Boiaad~9wFh*eU$ub-b@cpPJ0 z+76tiPHjYLs*su_%}`ga;{k=b><9yp0^>2XXC_0eh|DCUtALqa&MuLdb~3tPT^Es; 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