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- From: scallan@sweetpea.jsc.nasa.gov (-BJS-)
- Subject: Robust Controller Synthesis w/ MATLAB
- Message-ID: <1993Jan28.144346.1783@aio.jsc.nasa.gov>
- Followup-To: sci.engr.control
- Keywords: robust control matlab
- Sender: scallan@waco (-BJS-)
- Organization: MDSSC
- Date: Thu, 28 Jan 1993 14:43:46 GMT
- Lines: 46
-
-
- I have a question for those of you readers who have performed
- optimal controller synthesis using the robust control and mutools
- toolboxes available in matlab. I am attempting to design a controller
- for an "improper" system, i.e., the frequency response does not
- roll-off at high frequencies. Is there any such requirement on the
- plant in order to use the 'hinfsyn', 'h2syn', musynfit, etc.
- functions.
-
- The problem I am encountering does not seem to be related to this; I
- have problems with the row rank test on the matrix, [a b1; c2, d21].
- This matrix ends up being (7x5) and thus cannot have full row rank.
- Obviously, I have formulated the problem incorrectly, but I am not sure
- where I've gone astray. There are three measurements available to the
- controller and the "Z" vector (the measurements to be kept small) has
- one measurement. The performance specification (Wp) is second order,
- is this okay?? Can anyone give me possible avenues to explore which I
- might have missed?? The requirement indicates that the number (n+p)
- must be equal to or less than (n+m1+m2), where;
-
- n = number of states,
- p = number of outputs,
- m1 = number of exogenous inputs,
- m2 = number of controls
-
-
- Any ideas would be greatly appreciated either by e-mail or via
- posting. Thanks in advance.
-
- Befuddled but not Defeated,
-
- -BJS-
-
-
- --
-
- =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
- Brian J. Scallan, scallan@sweetpea.jsc.nasa.gov
-
- When angry, count four; when very angry, swear.
- Pudd'nhead Wilson - M. Twain
-
- The opinions expressed
- should not be interpreted as those
- of my employer or any other (semi-)rational entity. {-BJS-}
- =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
-