Home › Forums › FOMCON toolbox: Support forum › Fractional PID Controller Design
 This topic has 51 replies, 2 voices, and was last updated 5 years, 5 months ago by Aleksei.

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November 4, 2014 at 16:36 #999ShefaliGuest
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
ShefaliNovember 21, 2014 at 13:55 #1006ShefaliGuestHello 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
ShefaliNovember 21, 2014 at 14:00 #1008AlekseiKeymasterThere is no
optapp
function in FOMCON.November 23, 2014 at 13:10 #1009ShefaliGuestThank You sir…
I got the answer for the first error…but what about the 2nd error?
Thanks
ShefaliFebruary 10, 2015 at 14:53 #1047Pritesh ShahGuestDear 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)
February 10, 2015 at 15:27 #1049AlekseiKeymasterPlease provide a particular example and/or screenshot. Which GUI are you referring to?
February 11, 2015 at 15:14 #1050Pritesh ShahGuestDear 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)===========================================
April 22, 2015 at 15:35 #1061Naeem HaiderGuestHi,
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 …. ..
April 22, 2015 at 15:42 #1064AlekseiKeymasterI assume that you are using FOMCON.
Check whether the FOD library is on MATLAB path.
Also, which version of MATLAB are you using?April 23, 2015 at 12:46 #1065Naeem HaiderGuestHi.
yes i am using Fomcon 0.41beta, 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……..
April 23, 2015 at 12:54 #1067AlekseiKeymasterIt is included, but not supported in MATLAB R2010a.
Please see this comment: https://fomcon.net/fomcontoolbox/download/#comment1919April 25, 2015 at 18:26 #1068Naeem HaiderGuesthi.
thank you for the help .. i will try with 2013 version of matlab….
thank you…..
May 6, 2015 at 07:07 #1071Nitish KatalGuestSir,
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.
May 6, 2015 at 11:59 #1074AlekseiKeymasterPlease post the specific text of the error.
May 9, 2015 at 06:41 #1075Nitish KatalGuestSir here is the image of the error am getting.
[IMG]http://i61.tinypic.com/25z6xds.jpg[/IMG] 
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