Amplitude and phase of transfer function

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Alexis Miranda
Alexis Miranda 2016-11-10
编辑： Zhuxuan 2025-2-27
How do I plot of the amplitude and phase of a transfer function (complex modulus) as a function of frequency (ω) up to 100,000 radians/s. Please use a logarithmic axis for ω when presenting your plot. Given the following equations for amplitude and phase: μ= 5 Pa•s, E= 1 kPa

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回答（2 个）

D S Acharya
D S Acharya 2023-10-14
%for magnitude
omega=0:100000; mu=5; E=1000;
numerator=omega*mu;
denominator=sqrt(1+((numerator/E).^2));
tf=numerator/denominator;
%for phase
phase=(pi/2)-atan(numerator/E);
semilogx(omega,tf);
figure;
semilogx(omega,phase);
Zhuxuan
Zhuxuan 2025-2-27
编辑：Zhuxuan 2025-2-27
I didn't look at the specific function you need to plot.
But for the bode plot of a transfer function, in general, you can use the function tr (transfer function) and bode (bode plot). The function bode can even generate the plot automatically:
sys = tf(numerator,denominator)
[mag,phase,wout] = bode(sys)
Hope it can help!

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