# Fractional PID Controller Design

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Viewing 15 posts - 31 through 45 (of 52 total)
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• #999
Shefali
Guest

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

#1006
Shefali
Guest

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;

Thanks
Shefali

#1008
Aleksei
Keymaster

There is no optapp function in FOMCON.

#1009
Shefali
Guest

Thank You sir…

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

Thanks
Shefali

#1047
Pritesh Shah
Guest

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)

#1049
Aleksei
Keymaster

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

#1050
Pritesh Shah
Guest

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)

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

#1061
Naeem Haider
Guest

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 …. ..

#1064
Aleksei
Keymaster

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

#1065
Naeem Haider
Guest

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……..

#1067
Aleksei
Keymaster

It is included, but not supported in MATLAB R2010a.

#1068
Naeem Haider
Guest

hi.

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

thank you…..

#1071
Nitish Katal
Guest

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.

#1074
Aleksei
Keymaster

Please post the specific text of the error.

#1075
Nitish Katal
Guest

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

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