Creating PTn transfer function by
5 visualizaciones (últimos 30 días)
Mostrar comentarios más antiguos
Ruben Dumas
el 26 de Mzo. de 2020
Comentada: Star Strider
el 27 de Mzo. de 2020
Hi
I have results ofthe response of a system on different inputs.
I want to create a couple transfer functions of the from TF = k/(Ts+1)^n, with n=1 or 2 or 3. So 'k' and 'T' need to be determined.
Is it possible in matlab to generate a response of this transfer function with unknown 'k' and 'T'. Because I would like to determine them by minimising the the mean square error of the response of the transfer function and the real response of the system.
0 comentarios
Respuesta aceptada
Star Strider
el 26 de Mzo. de 2020
To fit them in the time domain:
syms k s T
TF1 = k/(T*s+1);
TF2 = k/(T*s+1)^2;
TF3 = k/(T*s+1)^3;
TF1t = ilaplace(TF1);
TF1fcn = matlabFunction(TF1t);
TF2t = ilaplace(TF2);
TF2fcn = matlabFunction(TF2t);
TF3t = ilaplace(TF3);
TF3fcn = matlabFunction(TF3t);
B0 = [T0; k0];
B = lsqcurvefit(@(b,t),TF1fcn(b(1),b(2),t), B0, xdata, ydata);
and similarly for the others, where ‘xdata’ and ‘ydata’ are the time and amplitude data.
The System Identification Toolbox, for all its strengths, is not intended for this sort of parameter estimation.
2 comentarios
Más respuestas (0)
Ver también
Categorías
Más información sobre Dynamic System Models en Help Center y File Exchange.
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!