online system identification NI-6008

[saifizi]

Dear All,

I have problem when handling my system identification toolkit. When I running my system in real time, i get this error;

"The model orders are inconsistent with the dimensions of the model coefficients."

How can i settle this problem. I don't know what is happening actually. I hope some can give some suggestion, why this situation occur. The problem happen when the ouput of ARMAX or ARX system model out connected to SI Conversion. I make the connection cause of to draw the tranfer function.

Thanks All.

[EUgo]

Hi saifizi,

the ARX or ARMAX model needs X values to calculate the model. The number of the samples [X] correlates with the model orders.

You have to handle the error for the first X sampels.

For your ARX example (A order = 1, B order = 2) the model needs 3 sampels to calculate the model.

[bofy]

hello .. i also use ni usb 6008 for online system identification motor dc , but i confused and i'am newbie using labview
can you help me ? 😞

[feesho]

I would suggest going through the getting started guide to LabVIEW materials. There should be sufficient material there to get you started on both software and hardware.
http://www.ni.com/getting-started/labview-basics/

For the System Identification Toolkit, I suggest looking though the help file to learn more about how to use the functions.

http://zone.ni.com/reference/en-XX/help/372458D-01/