[From Rick Marken (950914.0745)]
Jeff Vancouver (950913.0950) --
I will reply to your post as soon as possible, Jeff. You asked some excellent
questions. It will take some time to answer them properly.
Me:
Now how about getting to it, Hans. x(t) = u(t) + d(t). You write a
model-based control system that generates u(t) and keeps x(t) =r(t).
Hans Blom (950914) --
If I do, and if it works, will that convince you? Of what?
If your model-based control scheme controls as well as the simple, integral
controller, then I will be convinced that a model-based control system can
control as well as a "normal" control system (I currently believe that a
model-based control system cannot control at all -- in the sense of
systematically compensating for arbitrary (and undetectable) disturbances
to the variable perceived by the system). If your model based scheme controls
better than the simple, integral controller, then I will be convinced that
the model- based control architecture represents an important advance over
the basic control architecture; and I will suggest renaming our theory
MPCT -- model-based perceptual control theory.
All I ask is that you do what Bill Powers (950914.0540 MDT) suggests:
just plug your control-system model (with a function call) into the line in
my code labelled "model"
In response to Bill's request, you [Hans Blom (950914c)] said:
Will do. Give me some time. They do the same thing: control.
We shall see. I'm waiting...
Best
Rick
Hans Blom (950914) --
>If I do, and if it works, will that convince you? Of what?
If your model-based control scheme controls as well as the simple, integral
controller, then I will be convinced that a model-based control system can
control as well as a "normal" control system (I currently believe that a
model-based control system cannot control at all -- in the sense of
systematically compensating for arbitrary (and undetectable) disturbances
to the variable perceived by the system). If your model based scheme controls
better than the simple, integral controller, then I will be convinced that
the model- based control architecture represents an important advance over
the basic control architecture; and I will suggest renaming our theory
MPCT -- model-based perceptual control theory.
I've found "control" (and "purpose") to be misleading if used outside of
the "mechanistic" models of control theory.
I've found "perceptual" to be misleading if used outside of "organic"
perceptual pattern theories. Organic including all those processes which
arise out of the functioning of organic processes, which when removed one
or two levels of ontological recursion includes everything.
Indeed, the whole notion of purposive-behavior while somewhat useful,
seems to me more and more a human derivation without ultimate foundation.
I defer to Humberto Maturana, Heinz Von Foerster, Gregory Bateson, and
Wittgenstein.
I would be interested in knowing if anyone is trying to integrate control
theory and chaos theory into their models and experimentation. That, it
seems to me, would be truer to life (and to "reality").
james