MATLAB: Generating bode plot in simulink

bode plotSimulink Control Design

how do I get Bode plot in Simulink?

Best Answer

If you have the Simulink Control Design product you can use the "linearize" command to obtain a linear model. You can then use the bode command to plot it. These operations can also be performed via a GUI http://www.mathworks.com/help/slcontrol/ug/visualize-models.html#bs6uoqg

Related Solutions

MATLAB: Bode Diagram

You need to use bodeoptions command and set PhaseWrapping to on. Here is an example showing how to do it:

>>s=tf('s'); %define Laplace variable

>>freq=logspace(-1,2,1000); %define frequency vector

>>sys=1/(s^3+2*s^2+3*s+1); %some tf with phase <-180

>>bode(sys,freq) %phase is not within -180:180

>>p=bodeoptions

>>p.PhaseWrapping='on'

>>bode(sys,freq,p) %phase is wrapped inside -180:180

HTH, Arkadiy

MATLAB: Bode() magnitude

Magnitude and phase outputs of bode are 3-D arrays, for representing multi-input multi-output systems. The first two dimensions correspond to the number of inputs and outputs, the third dimension corresponds to the number of frequency points. In your case you have a single-input single-output system, so size(mag) is 1 1 n, where n is the number of frequency points.

To get a standard bode plot you can just do

bode(sys)

If you want access to mag and phase as regular vectors, just do

mag=squeeze(mag)

All of this is covered in the doc.

Arkadiy

Best Answer

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MATLAB: Bode Diagram

MATLAB: Bode() magnitude

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