Re: Matlab example

Dear Sigurd Skogestad,

Thank you for you help. It seems the problem was caused by the version
of the mu toolbox I was using which was older than the one you wrote the
examples for. I have sorted that out and your examples run fine now. I
have to say that I find your book very useful, in that it is written in a
very practical manner. I am looking into applying H infinity control to
power transmission systems and the practical engineering approach which
you have taken in your book is very much facilitaty my work. Thanks
again,

Gayle Collins

gfc@ohm.york.ac.uk
12 Newland Park Drive
York England YO1 3HN
441 904 424 766

From mtcameron@t-online.de Tue, 4 Mar 97 23:11 +0100
Date: Tue, 4 Mar 97 23:11 +0100
From: mtcameron@t-online.de (M.T. Cameron)
Subject: Book & RGA
To: ixp@leicester.ac.uk
Status: O

Dear Prof. Postlethwaite

I'm a very proud of my new book "Multivariable Feedback Control". As a
practitioner I began reading with the chapter 10, exactly 10.8 ... the part
related with decentralized control.

A year ago I was working with RGA in a problem related with the pairing problem

in a multivariable system (... a two stand cold rolling mill) but the results
wasn't very good. After that I readed the paper of Huang, Ohshima & Hashimoto
"Dynamic interaction and multiloop control system design" J. Proc. Cont. 1994
Vol. 4 Number 1. pp 15-27 ... and there I hear what I probably wanted to hear
... RGA is not the best tool to solve the pairing problem. With three examples
they show that RGA doesn't give the best pairing. The problem now is that after
reading the part 10.8 of your book I'm very confused because you are using RGA
to solve the pairing problem.

If you know the mentioned paper it would be very very kind of you I you can give
me some coments about it. Do you think that the steps 1,2 and 3 of 10.8.5 solve
the problems found by Huang et al?

Thank you in advance for your kind consideration

Sincerely

M.T.Cameron

PS. I work for ABB Industrial Systems in Germany, there I'm responsible for the
technological development related with the automation and control of hot rolling
mills ... since monday

PO Box 100117
68001 Mannheim
Germany

Phone/Fax +49 (621) 406077
Received on Mon Mar 3 11:56:54 1997