tunbridge wells juggling club
This commit is contained in:
parent
03b5905ff1
commit
4bc631a54b
@ -56,12 +56,14 @@ The more dangerous the consequences of failure
|
||||
the higher SIL rating we can demand for it.
|
||||
%
|
||||
A band-saw with one operative may require a SIL rating of 1,
|
||||
a nuclear power-station, with far greater consequences on dangerous failure
|
||||
but something with higher potential for harm to a larger number of people,
|
||||
such as a nuclear power-station or air-liner,
|
||||
with far greater consequences on dangerous failure
|
||||
may require a SIL rating of 4.
|
||||
%
|
||||
What we are saying is that while we may tolerate a low incidence of failure on a band-saw,
|
||||
we will only tolerate extremely low incidences of failure in nuclear plant.
|
||||
SIL ratings give us another objective yardstick for the measurement of system safety.
|
||||
SIL ratings provide another objective yardstick for the measurement of system safety.
|
||||
%governing failure conditions and determining risk levels associated with systems.
|
||||
|
||||
All of these risk assessment techniques are based on variations of %on the theme of
|
||||
@ -80,11 +82,11 @@ which make them unsuitable for the higher safety requirements of the 21st centur
|
||||
Problems with state explosion in failure mode reasoning and the current difficulties %impossibility
|
||||
of integrating software and hardware failure mode models~\cite{1372150} are the most obvious of these. %flaws.
|
||||
%
|
||||
The four current methodologies are described in chapter~\ref{sec:chap2} and %the advantages and drawbacks
|
||||
These four current methodologies are described in chapter~\ref{sec:chap2} and %the advantages and drawbacks
|
||||
%of each FMEA variant are examined
|
||||
critically assessed in chapter~\ref{sec:chap3}.
|
||||
In chapter~\ref{sec:chap4}, a new methodology is proposed which addresses the state explosion problem
|
||||
and, using contract programmed software, allows the modelling of integrated
|
||||
and using contract programmed software, allows the modelling of integrated
|
||||
software/electrical systems.
|
||||
%
|
||||
This is followed by two chapters showing examples of the new modular FMEA analysis technique (Failure Mode Modular De-Composition FMMD)
|
||||
@ -169,9 +171,10 @@ Using the symptoms of failure, we could now treat these modules as components in
|
||||
{\fgs}. Higher and higher levels of {\fgs} could be built until we had a hierarchy
|
||||
representing a failure mode model for the system.
|
||||
%
|
||||
Because this is modular, we can apply double simultaneous failure mode checking; and as %because
|
||||
Because this is modular, %we can apply double simultaneous failure mode checking; and as %because
|
||||
double simultaneous failure mode checking can be applied as
|
||||
the number of components
|
||||
in each {\fg} is typically small---we avoid state explosion problems. % for the general case. % AF says `in the general case' here 12JAN2013
|
||||
in each {\fg} is typically small; we therefore avoid state explosion problems. % for the general case. % AF says `in the general case' here 12JAN2013
|
||||
%
|
||||
%
|
||||
If we apply
|
||||
@ -179,7 +182,7 @@ double checking all the way up the hierarchy we can guarantee to have considered
|
||||
every double simultaneous failure of all components in a system.
|
||||
%
|
||||
This means, as a fortunate by-product, that many multiple as well as double
|
||||
failures would be analysed, but because failure modes are traceable from the base components to the top level---or system---failure modes
|
||||
failures would be analysed, but because failure modes are traceable from the base components to the top level---or system---failure modes,
|
||||
these relationships can be held in a traversable data structure.
|
||||
%
|
||||
If held in a traversable data structure we can apply automated methods to search for all the combinations of multiple failure modes
|
||||
@ -200,7 +203,7 @@ be more user friendly than using formal logic.
|
||||
For an FMEA Spider diagram, contours represent failure modes, and the Spider diagram
|
||||
`existential~points' represent instances of failure modes.
|
||||
%
|
||||
Overlapping contours could represent multiple failure modes.
|
||||
Overlapping contours represent multiple failure modes.
|
||||
%
|
||||
By drawing a spider collecting existential points, a common failure symptom could
|
||||
be determined and from this a new diagram generated automatically to represent the {\dc}.
|
||||
|
@ -1,4 +1,4 @@
|
||||
\renewcommand{\baselinestretch}{1.1}
|
||||
\renewcommand{\baselinestretch}{1.15}
|
||||
\chapter*{Colophon}
|
||||
|
||||
In short ``Thanks every body''!
|
||||
@ -18,21 +18,23 @@ and its members will always remain dear to me.
|
||||
My first debt of gratitude must go to my supervisors,
|
||||
Dr. C Garret, %% TOP BLOKE
|
||||
Professor J. Howse and %% JAVALA LAT HUND
|
||||
Dr. A. Fish %% JAVALA LAT HUND
|
||||
.
|
||||
Dr. A. Fish. %% JAVALA LAT HUND
|
||||
%
|
||||
They patiently provided the guidance,
|
||||
encouragement and advice necessary for me to proceed through the
|
||||
research, consolidation and write-up phases of the PhD program,
|
||||
to prepare and submit three papers to conferences~\cite{syssafe2011,syssafe2012,Clark_fastzone}
|
||||
to prepare and present three papers to conferences~\cite{syssafe2011,syssafe2012,Clark_fastzone}
|
||||
and to complete and submit this thesis.
|
||||
|
||||
%
|
||||
I owe a debt of thanks to Dr J. flower, my MSc project supervisor,
|
||||
who explained that the chapter in my project documentation postulating a modular form of
|
||||
FMEA---which had obvious potential for making FMEA
|
||||
FMEA---which had %obvious
|
||||
potential for making the process %FMEA
|
||||
more efficient---was a concept worthy of being developed for a PhD and assisting me
|
||||
to submit this as a conference paper~\cite{Clark200519}.
|
||||
to present the chapter as %submit this as
|
||||
a conference paper~\cite{Clark200519}.
|
||||
%
|
||||
Further I thank her for encouraging me to apply for the PhD. %% PITY SHE DID NOT STAY ON AS MY PHD SUPERVISOR
|
||||
%
|
||||
|
||||
@ -57,7 +59,7 @@ applications and benefits.
|
||||
|
||||
% Grandma Serife Gur and grandaunt Fadime Altinteril, who left us too soon.
|
||||
|
||||
I wish to thank my parents, Jeniffer and Richard Clark.
|
||||
I wish to thank my parents, Jennifer and Richard Clark.
|
||||
% MY MUM for proof reading alot!
|
||||
I hope that this work makes you proud.
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user