last few first person refs found by grep
This commit is contained in:
parent
5cfc3d70ec
commit
6f9ff6ab59
@ -921,7 +921,7 @@ failure modes as an intrinsic part of its process, which can be considered a wea
|
||||
\label{sec:detectable}
|
||||
\fmmdglossOBS
|
||||
Often the effects of a failure mode may be easy to detect,
|
||||
and our equipment can react by raising an alarm or compensating for the resulting fault.
|
||||
and equipment can react by raising an alarm or compensating for the resulting fault.
|
||||
%
|
||||
Some failure modes may cause undetectable failures, for instance a component that causes
|
||||
a measured reading to change could have adverse consequences yet not be flagged as a failure.
|
||||
|
@ -696,7 +696,7 @@ The above definition of a part, needs further refinement, i.e. to be defined as
|
||||
an atomic entity. % used as a building block.
|
||||
%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.
|
||||
{\Bc} is defined as the lowest level entity ---an entity with which we begin our analysis---a component
|
||||
{\Bc} is defined as the lowest level entity --- an entity with which to begin analysis --- a component
|
||||
used as a starting bottom-up building block.
|
||||
%This is a choice made by the analyst, often guided by the standards to which the analysis is being performed. % to.
|
||||
%
|
||||
@ -953,7 +953,7 @@ to see how they could be caused.
|
||||
\fmeagloss
|
||||
%
|
||||
The aim of FMMD analysis is to produce complete\footnote{Completeness dependent upon the completeness/correctness of the {\fms} supplied by the germane standard
|
||||
for our {\bcs}.} failure
|
||||
for the {\bcs}.} failure
|
||||
models of safety critical systems from the bottom-up,
|
||||
starting where possible with known base~component failure~modes.
|
||||
%
|
||||
@ -1157,7 +1157,7 @@ component used to build the functional group it was derived from plus 1.
|
||||
So a derived component built from base level components
|
||||
would have an $\abslev$ value of 1.
|
||||
%
|
||||
In our example the resistors and op-amp are level zero ({\bcs}, $\abslev=0$), the {\em PD} a level 1 {\dc} ($\abslev=1$) and the {\em INVAMP}
|
||||
In this example the resistors and op-amp are level zero ({\bcs}, $\abslev=0$), the {\em PD} a level 1 {\dc} ($\abslev=1$) and the {\em INVAMP}
|
||||
a level 2 {\dc} ($\abslev=2$).
|
||||
%\clearpage
|
||||
Because {\fgs} may include components at varying levels
|
||||
@ -1172,7 +1172,7 @@ The abstraction level concept is formally defined in appendix~\ref{sec:abstracti
|
||||
%Tie into wish list at end of chapter 3. Solves state explosion, completeness, traceability, models for related such as FMECA
|
||||
\paragraph{Failure model Completeness.}
|
||||
It is undesirable to miss any component {\fm} in the analysis process; were this to
|
||||
happen our failure model would be incomplete.
|
||||
happen the failure model would be incomplete.
|
||||
%
|
||||
Given the starting conditions of base component {\fms} from the literature,
|
||||
it can be ensured that all these {\fms} are traceable to subsequent {\dc} {\fms}
|
||||
|
@ -572,7 +572,7 @@ by stating:
|
||||
%
|
||||
$$ fm(\cf{Read\_ADC}) = \{ CHAN\_NO, VREF, VV\_ERR \} $$
|
||||
%
|
||||
With the failure mode model for our function, it is used in conjunction
|
||||
With the failure mode model for this function, it is used in conjunction
|
||||
with the ADC hardware {\dc} CMATV, to form a {\fg} $G_2$, where $G_2 =\{ CMATV, \cf{Read\_ADC} \}$.
|
||||
%
|
||||
This {\fg} is analysed in table~\ref{tbl:radc}. %{ hardware/software combined {\fg}.
|
||||
@ -697,7 +697,7 @@ can fail. An $OUT\_OF\_RANGE$ condition will be flagged by the error flag variab
|
||||
The $VAL\_ERR$ will simply mean that the value read is incorrect: an undetectable {\fm}
|
||||
and therefore undesirable condition.
|
||||
%
|
||||
Finally a {\dc} is created to represent a failure mode model for our
|
||||
Finally a {\dc} is created to represent a failure mode model for the
|
||||
combined hardware and software {\ft} input. % failure mode model.
|
||||
%
|
||||
This can be named $ R420I $, for {\em read {\ft} input}.
|
||||
|
Loading…
Reference in New Issue
Block a user