New to system identification in Labview

[E-warrior]

Hello everyone..

I'd like to inquire if there is any hand on tutorial or instructions on how to program a system identification for a second order without a DAQ, what i have is a CRIO, which i generate a square signal, i retrieve the response, but i have a hard time getting the transfer function. Maybe if somebody has a link or a support for this, i'd really appreciate it.

Thank you very much

[NIF_Vincent.O]

Hi E-Warrior,

I hope this tutorial will help you (2nd part of the turorial).

There is an example with a cDAQ but maybe you could change it to use it with your cRIO (or by a software solution).

Best Regards,

[E-warrior]

Hello Vincent

Thank you man for ur response,

i am determined on fixing the issue i have, i am sure u probably have seen my other similar earlier thread, the problem i have Vincent is that i generate the signals inside the loop but i can't retrieve the signals "stimulus and response" outside the loop, in order to do SI TF block for identifying the model. 

I am kinda  sure it has something to do with the timming in the loop in the RT "CPU of the CRio" versus the sampling in the FPGA

So if you don't mind, can u spot the problem, the program isn't not big or anything, it is just one main VI that is a nightmare; 

thank you sir

[E-warrior]

i tired to compress the whole project, but .rar isn't accepted, hope u'll be able to open the target RT file...that's where i attempt to do identification

[NIF_Vincent.O]

Hello E-Warrior,

I'm not sure but if you try to display your signal outside the loop, you'll probably be able to display only the last value of this signal (and you won't see that single point on your graph.

Regards,

[E-warrior]

Hey Vincent

But i thought and intuitively looks like the SI TF "this is the function that receives the stiumulus and the response" for identifying the model should be outside the loop.

Were you able to open the target VI...

thanks man. The help is appreciated

[NIF_Vincent.O]

E-Warrior,

I juste picked up a cRIO and i need some files to help you, could you send me this one please ?

variables - network - RT (separate).lvlib

support - acquire data.vi

thank you,

[E-warrior]

Hey Vincent...i appreciate it man

here i attach the file you asked for...

[NIF_Vincent.O]

E-Warrior,

Thank you for that file,

Could you also send me that one please ?

support - acquire data.vi

I'll do my best to help you,

Regard,

[E-warrior]

Definetely...

i'm determined to get this stuff work,  because of ur help man. here is attached

Thanks