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- Date: Wed, 22 Jul 1992 17:16:41 -0600
- Sender: "Control Systems Group Network (CSGnet)" <CSG-L@UIUCVMD.BITNET>
- From: "William T. Powers" <POWERS_W%FLC@VAXF.COLORADO.EDU>
- Subject: S
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-
- Hello, Martin --
-
- I have an ulterior motive in throwing that problem back into your lap.
- Right now the CSG has only three people actively developing simulations and
- doing HPCT experiments: Rick Marken, Tom Bourbon, and me. That isn't
- enough. Rick and Tom both began, when they started working with me, with
- only a rudimentary understanding of BASIC and no real-time simulation
- experience at all. Both of them have since become quite expert in this
- field and no longer need me to show the way.
-
- You are probably farther ahead than either of them were, by a long
- distance, in all regards. But I'm going to be frank with you: you have a
- tendency to sit on your butt and try to figure things out in general and in
- the abstract without carrying the ideas to the stage of actual testing. I
- would love to get you out from behind that desk and into some programming
- of real experiments and simulations. You would obviously be extremely good
- at it. You are already very proficient at analysis; there would be less cut
- and try for you than there is for me. I expect that you already do, or at
- least supervise, a lot of this kind of experimentation and stimulation --
- but not in HPCT.
-
- I understand what you mean about simulations vs. analysis. But an analysis
- contains far more in it than you will ever notice (even when it's done
- right). The analysis stage is extremely useful for looking at
- sensitivities, singularities, extremums, and so on. I use it a lot that
- way, within my capacities. But a simulation of something you think you
- already understand through analysis, I guarantee you, will produce both
- surprises and shocks -- and sometimes delight. Analysis can't give you a
- grasp of control theory anything like what you can get out of writing and
- running even a SIMPLE simulation of a SIMPLE control process. There is
- nothing in analytical forms to suggest solving for different variables, re-
- expressing the forms in ways that reveal new relationships, and so on. No
- matter how much you know already, a simulation will teach you more.
-
- I hope you'll brush up your programming techniques by trying some simple
- control system simulations before you get into the complexities; do some
- five-finger exercises first. I'm here to help.
-
- I've had more than one excited phone call from Rick and Tom over the years,
- saying "You won't believe this, but this stuff ACTUALLY WORKS!" Join the
- party.
-
- Best,
-
- Bill
-
- PS: I wish you were coming to Durango, too.
-