Fractional PID Controller Design

[Shefali]

Thank you very much.I got it correct now.

But facing error for:

Undefined function or method ‘optapp’ for input arguments of type ‘tf’.

Error in ==> FOoustal at 12
G2=optapp(G,0,1,1);

function optapp is the correct name or not?Please suggest.

Thanks
Shefali

[Shefali]

Hello Sir,
Please answer my question as I am getting stucked and cannot proceed further…

1.
Error in ==> FOoustal at 12
G2=optapp(G,0,1,1);

function optapp is the correct name or not?Please suggest.
2.
While approximating an IO controller from a FO controller, i am getting below error:

Array dimensions must match for binary array op.

Error in ==> FOapprx at 15
h=1.8393.*h1.^0.9600.*h2.^1.7600.*h3;

Please answer…its a request.

Thanks
Shefali

[Aleksei]

There is no optapp function in FOMCON.

[Shefali]

Thank You sir…

I got the answer for the first error…but what about the 2nd error?

Thanks
Shefali

[Pritesh Shah]

Dear Aleksei,
————————————
Regaring Fractional PID Design Tool
————————————

Taking any fotf transfer function say 1/(s+1)^3.

If you select different time step in GUI, we are getting differnt plots.
(with the same FPID parameters)

(Time–> Simulation)

[Aleksei]

Please provide a particular example and/or screenshot. Which GUI are you referring to?

[Pritesh Shah]

Dear Aleksei,

I am refering Fractional PID Design Tool.

(Fomcon–> Tools–> Frational PID Design)

fpid is GUI name in toolbox.

=========================================

Taking any fotf transfer function say 1/(s+1)^3.

If you select different time step in GUI, we are getting differnt plots.
(with the same FPID parameters)

===========================================

[Naeem Haider]

Hi,

i am making a simulink model of a Ball and beam system with PID controller and i have used transfer function of ball and beam and servo motor to design a pid controller….

and now i want to use Fractional PID with the same model… and when i put fractional pid block in the simulation it gives an error of LTI ??? system.. so i used State space models instead of transfer function …. but its not working ….. please tell guide me what to do and how to model ball and beam system with FOPID in simulink …. ..

[Aleksei]

I assume that you are using FOMCON.
Check whether the FOD library is on MATLAB path.
Also, which version of MATLAB are you using?

[Naeem Haider]

Hi.

yes i am using Fomcon 0.41-beta, and i am using matlab 2010a ….i have set all the libraries in the pack with matlab path….

i think FOD library is not included in the pack……..

[Aleksei]

It is included, but not supported in MATLAB R2010a.
Please see this comment: https://fomcon.net/fomcon-toolbox/download/#comment-1919

[Naeem Haider]

hi.

thank you for the help .. i will try with 2013 version of matlab….

thank you…..

[Nitish Katal]

Sir,

I’m trying to use a fractional order PID controller K , which I’ll optimize using GA.

When in my matlab script, am trying to create closed loop using G*K/(1+G*K). Its returning errors.

Is it not possible to multiply a continuous time transfer function with a fractional order controller.

If it’s possible, please guide me through it. I’m using Matlab 2013a.

Thanks and Regards.

[Aleksei]

Please post the specific text of the error.

[Nitish Katal]

Sir here is the image of the error am getting.
[IMG]http://i61.tinypic.com/25z6xds.jpg[/IMG]

[Author]

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