MATLAB: Open loop transfer function from bode plot response

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Hi, I have magnitude and phase response values . I want to know transfer function from these two. I request any Matlab code for this. Regards Srinivasu.

Best Answer

First use the iddata function, then the tfest function.

You will need the System Identification Toolbox to use these functions.

The Signal Processing Toolbox has limited system identification capabilities. See the documentation for invfreqz and related functions.

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MATLAB: Bode Plot Transfer Function

Here you are:

close all
clearvars
s=tf('s')
H=(s^4+s^2+1)/(s^4+2*s^3+3*s^2+4*s+1)
opts = bodeoptions('cstprefs');
opts.PhaseVisible = 'off';
bodeplot(H, opts );
grid on; zoom on;

MATLAB: How to use ‘idfrd’ system object as a channel model in simulink

You cannot do time domain simulation on a frequency response model. What you can do is fir a transfer function or state space model to match the measured frequency response. You can use commands tfest and ssest for that. Once you have a transfer function/state-space object, you'll be able to simulate in Simulink using LTI system block or just Transfer Function and State Space blocks.

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MATLAB: Bode Plot Transfer Function

MATLAB: How to use ‘idfrd’ system object as a channel model in simulink

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