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Topic: Model uncertainity measurement
Replies: 1   Last Post: Jun 21, 2011 8:56 PM

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mehmet tk

Posts: 23
Registered: 8/8/07
Re: Model uncertainity measurement
Posted: Jun 21, 2011 8:56 PM
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any help?

"Shelia kk" wrote in message <itq8vc$16c$>...
> Hi All,
> I have two n-dimensional LTI models such as
> X1dot = A1*X1 + B1*U ;
> y1 = C1*X1 ;
> and
> X2dot = A2*X2 + B2*U ;
> y2 = C2*X2 ;
> X2 is an approximation of X1 and therefore there is an uncertainty between the responses of the two models. such that
> X1dot = (A2+ Auncertainty)*X1 + (B2+Buncertainty)*U
> I want to measure the bounds of these uncertainities (Auncertainty) and (Buncertainty). How can I do that? Which function in Robust Control Toolbox help me to measure the uncertainties? norm(A1-A2) is not the solution. I think I should use frequency response methods to obtain Hinf norms but not quite sure. Thanks

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