Forwarded: Re: multivariable servomechanism (p

Dear Sigurd

Below is my brief reply to Bernado.

Cheers

Ian
******************************

From: Self <IXP>
To: bernardo@tamarugo.cec.uchile.cl
Subject: Re: multivariable servomechanism (postlethwaite)
Date: Mon, 7 Apr 1997 10:42:53

Dear Bernado

Rolling mills are required to follow ramps at start-up ie the speed is ramped up from
zero to some steady state value. Gain scheduling is often then used because the models
are different at different speeds.

Perhaps you could find such a model in the literature. You really need a nonlinear
model. We have one but it was provided by a company who will not let us give it to a
third
party.

Regards

Ian Postlethwaite
*************************

>Date: Mon, 31 Mar 1997 15:44:31
>From: bernardo@tamarugo.cec.uchile.cl (Bernardo A. Leon de la Barra S.)
>To: ixp@leicester.ac.uk
>Subject: multivariable servomechanism (postlethwaite)
>
>dear prof. postlethwaite,
>
>i am using your book "multivariable
>feedback control" as the textbook
>for a course i am teaching this semester
>
>i wonder if you have come across
>linear multivariable servomechanisms
>(with at least two outputs and two inputs)
>which can follow ramp signals without
>steady state error
>
>i would appreciate any help in locating
>models of real systems which satisfy the
>above description
>
>by the way, the ramp tracking requirement
>can apply to one of the outputs or to both
>of them
>
>i look forward to your reply
>
>sincerely,
>
>
>---------------------------------------------------------------------------------------
>------
>Bernardo A. [Le\'on de la Barra], Ph.D. (surname is within brackets)
>Automatic Control Group
>Department of Electrical Engineering
>University of Chile
>PO Box 412-3 Street Address: Avenida Tupper 2007 (Room 310)
>Santiago
>Chile
>phone: + 56 2 6784215 (office) and 6784207-6727832 (secretary)
>fax: + 56 2 6727832 (office) and 6953881 (departmental)
>email: bernardo@tamarugo.cec.uchile.cl
>www home page: http://gavilan.die.uchile.cl/~bernardo/
>www home page: http://146.83.6.65/~bernardo/
>---------------------------------------------------------------------------------------
>------
>
>
>
>
Received on Mon Apr 7 12:46:44 1997