[from Gary Cziko 921294.2100 GMT]
Rick Marken (921204.1030) said:
if you add a disturbance to the error
signal it will not be resisted: it acts like an offset to the reference for
the controlled perception (I think I posted the algebra for this some
time ago)
I don't remember seeing the algebra, and this does not make sense to me.
If error = reference signal - perception, a good control system will keep
error near zero. If I add in a disturbance to the error so that, e.g.,
error = reference signal - perception + 5, then error will still be kept
near zero. The system will do what it has to do to get rid of the effect
of the +5. How is this not controlling error?--Gary
ยทยทยท
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