How to implement transfer functions for decoupling purpose in labview??

[Waleed1984]

Hello;

I am doing my senior project in controlling extruder machine using LabView. I did my design and simulation using SIMULINK but I need to implement some transfer functions in labview for decoupling the process.

For example:

My input signal should pass through some transfer function and I wanna convert the output into control signal in voltage. How can I do this in LabView.

Regards

Waleed Abdul Ati

[Brian_K.]

Hi Waleed1984,

Let me first ask what you mean by decouple.  And for your output voltage, are you using a DAQ card (and at what speed).

There are a few ways to implement a signal passing through a transfer function and then outputing to a DAQ card.  My favorite at this moment is using MathScript.  I have attached a quick example program of how I would do it.

[Waleed1984]

Hi Mr.Brian K.,

Thank you for your help but can you please send me the file agian using LabView 8 because I don't have version 8.2.

Regarding decoupling, actually I have 2 inter-acting processes and I used multivariable control techniques. So, I used decoupling in which I separate each process from the other and by this way I will be able to design 2 different controllers easily.

In the following article you will find information about decoupling and multivariable control.

http://lorien.ncl.ac.uk/ming/mloop/mloop.pdf

Regarding DAQ cards, I am using NI USB-6009.

Thank you

Waleed

Message Edited by Waleed1984 on 02-26-2007 02:43 AM

[Waleed1984]

Please take in consideration that my transfer functions contains time delay equals 90 seconds.

[Brian_K.]

Hi Waleed,

Here is my example in LabVIEW 8.0.   Hope this clears up a way that you can solve this problem.