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Robin Clark 2010-10-26 23:07:48 +01:00
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fmmd_concept/fmmd_concept.tex
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@ -180,6 +180,9 @@ failure mode behaviour for say, differnet ambient pressures or temperatures.
If $E$ is the number of applied states or environmental conditions to consider If $E$ is the number of applied states or environmental conditions to consider
in a system, the job of the bottom-up analyst is complicated by a cross product factor again in a system, the job of the bottom-up analyst is complicated by a cross product factor again
$(N-1) \times N \times K \times E$. $(N-1) \times N \times K \times E$.
If we put some typical very small embedded system numbers into this, say $N=100$, $K=2.5$ and $E=10$
we have $99 \times 100 \times 2.5 \times 10 = 247500 $.
To look in detail at a quarter of a million test cases is obviously impractical.
If we were to consider multiple simultaneous failure modes If we were to consider multiple simultaneous failure modes
we have yet another complication cross product. we have yet another complication cross product.