MATLAB: How to make a bode plot from a transfer function

bode plotMATLAB

Hi how would I make a blode plot from this transfer function?

Gp(s) = (10e^-0.25S)/((1+1.2S)(1+3.5S))

is this the correct code in Matlab?

Best Answer

Yes.

The code you posted:

s = tf('s');
g = 10*exp(-0.25*s)/((1+1.2*s)*(1+3.5*s))
figure
bode(g)
grid

should work.

Are you having problems with it?

Related Solutions

MATLAB: Bode Plot – trasnfer function

Try this (your code slightly edited):

s = tf('s');
G = ((1+s*1E-3))/((s*1E-2)*(1+s*1E-1)*(1+s*1E-5));
bode(G)                                                 % Plot Only
[mag,phase,wout] = bode(G);                             % Information Only

See the documentation for the bode fucntion for details.

MATLAB: How to make sure that the Bode magnitude plot always always starts from 0 dB

The Bode magnitude plot starts from a non-zero offset because of the transfer function's DC gain. This can easily be obtained if s = 0 is substituted into your transfer function, which corresponds to a zero-frequency (hence static) input. The only way you can make the Bode magnitude plot start from 0 dB in this case is to factor out the DC gain from your transfer function.

The DC gain can easily be calculated using the "<https://www.mathworks.com/help/releases/R2016b/control/ref/dcgain.html dcgain>" function and then the transfer function can be divided by this constant number. Now the Bode magnitude plot will always start from 0 dB because the resulting transfer function has unity DC gain.

Best Answer

Related Solutions

MATLAB: Bode Plot – trasnfer function

MATLAB: How to make sure that the Bode magnitude plot always always starts from 0 dB

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