How to make a bode plot from a transfer function

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?

Answer 1

[Star Strider]

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?

[Uzair Akhtar]

Thank you. No problems just wasn't sure if it was right.

Do you by any chance know how I would determine the gain margin to find kcrit (10^(gain margin/20) and also wcrit in rads/s.

I need these values to determine the PID and PI controller settings.

Thanks.

[Star Strider]

My pleasure.

See the allmargin and margin functions.

You can calculate those yourself if necessary from the bode plot output:

[mag,phase,wout] = bode(sys)

[Uzair Akhtar]

Thank you really appreciate your help.

Im quite new to Matlab so I just wanted to confirm if I entered this transfer function correctly in the matlab code I sent in the previous message.

Thanks again.

[Star Strider]

As always, my pleasure!

It looks correct to me. Note that the exponential term is an output delay that primarily affects the phase of the Bode plot.