Re: Servo Control System without Integral Action

"tontoko hirorin" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> Is it true that the offset can not be compensated on the servo control
> system without integral action?
> I tried to simulate servo control system with a new action instead of
> integral action in the following webpage:
>
> http://139.134.5.123/tiddler2/digital3/digital3.htm
>
I agree with Tom's conclusion above.   I looks to me you are computing an
error and calculating a offset to fit the error.

I suggested in a earlier thread that the simulator parameter be in the
continous time domain so that we can enter parameters in as gains and
exponential frequency.   The link below provides a couple of ways of
converting the continous time to discete time.
http://www.deltacompsys.com/out/sec4.11.htm
This started as an example from 'Digital Control System Analysis and Design'
by Phillips and Nagle.

I prefer the 'brute force' exp(Ac*T)  or approach as it works well with a
C++ matrix class.  I am sure that there is Java matrix class that allows
these calculations to be done easily.  The exp(Ac*T) function shown can be
optimized.

BTW,  how did you expect us to choose a reasonable parameters in discrete
time when you haven't provided the update interval T?
Is the system a second order velocity system or a first order position
system.   You don't make that clear.

Peter Nachtwey