Re: PD2 Feedforward Control for Process Transfer Function with Damping = 0

On Thu, 14 Jun 2007 19:57:42 +0200, Zdenek Hurak wrote:

JCH wrote:
[...]
-- snip --

For instance, if I just have a look at the web page
http://home.arcor.de/janch/janch/_control/20070613-pd2(pid)z1z2/ , I can
see some block diagram. OK. But what is the goal of the control design
here? Fastest response? Is the reference signal only considered to be a
unit step? Is overshoot allowed? What are the assumptions about the
disturbances? What are the limitations on control variable? What can I
assume about the uncertainty in modelling? For instance, will not be the
assumption of at least 10% relative error in gain at low frequencies be
safer then just assuming totally accurate model?

-- snip --

Without further tuning for the purpose of simulations? Well..:-) Thousands
of papers have been written that feature the same exellency...:-) What you
can perhaps try is to analyze robustness of your controller by perturbing
the nominal model a bit (10% at low frequency, some phase shift, ...)

Z.

I'm just finishing up teaching a class in basic control theory for software
engineers. Whenever we manage to get beyond the mechanics of squeezing
polynomials until they drip out some useful information about system
behavior, I'm trying to instill the notions that systems change, systems
aren't linear, their models don't match your reality, and 'good'
performance depends heavily on what you're designing for.

--
Tim Wescott
Control systems and communications consulting
http://www.wescottdesign.com

Need to learn how to apply control theory in your embedded system?
"Applied Control Theory for Embedded Systems" by Tim Wescott
Elsevier/Newnes, http://www.wescottdesign.com/actfes/actfes.html
.

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