System Identification
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Hey!
I am designing a control system for a bearing system.
Here I have 3 inputs and one output. Can anybody tell me about the system identification of such system.
Regards, mac.
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Rajiv Singh
2012년 6월 27일
Try estimation functions such as OE, ARX, N4SID and PEM in releases R2011b and older. In R2012a you can also try TFEST, SSEST, PROCEST and POLYEST.
http://www.mathworks.in/help/toolbox/ident/ref/tfest.html http://www.mathworks.in/help/toolbox/ident/ref/oe.html
etc...
You will have to indicate what you tried if you want more concrete help.
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Markus
2012년 6월 28일
Hi Rajv! Im using version R2010b. i don't understand the parameters of nb nf and nk! Now i have 9 Inputs and 1 Output. Can u give me an example how to estimate this case with 9 Inputs? Have you get my PM with the problem?
Rajiv Singh
2012년 7월 9일
y(t) = B/F u(t-nk)
Number of coefficients of B is nb and number of coefficients of F minus 1 is nf. If you have 9 inputs nb, nf and nk are row vectors of length 9, one entry for each transfer function.
Example:
nf = 2*ones(1,9); nb = nf; nk = ones(1,9);
data = iddata(output, input_matrix_with_9_columns, Ts); % Ts = sample time
model = oe(data, [nb nf nk])
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