what is the MATLAB code for Sketch the polar plot of the frequency response for the following loop transfer functions: i. Gc(s)G(s

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Jerome 2024-1-16

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回答： Sam Chak 2024-1-16

Sketch the polar plot of the frequency response for the following loop transfer functions: using MATLAB

i. Gc(s)G(s) = 1 / ((1 + 0.25s)(1 + 3s))

ii. Gc(s)G(s) = 5(s2 + 1.4s + 1) / (s – 1)2

iii. Gc(s)G(s) = (s – 8) / (s2 + 6s + 8)

iv. Gc(s)G(s) = 20(s + 8) / (s(s +2)(s + 2))

Sketch the Bode diagram representation of the frequency response for the transfer functions give in problem (i).

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Dyuman Joshi 2024-1-16

@Jerome, Why have you posted your question as an answer, twice?

And as this is clearly a homework assignment, show what you have tried yet.

Jerome 2024-1-16

I'm trying to figure out the code for the polar and bode plot for this homework assignment, Can you help me out?

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Answer 1

Sam Chak 2024-1-16

在 MATLAB Online 中打开

Hi @Jerome

I believe that it is fair to ask for guidance on where you can find more information to solve problems by yourself. You asked for the command in MATLAB to sketch the polar plot of the frequency response. If I interpreted correctly, it should be the standard nyquist() command.

https://www.mathworks.com/help/ident/ref/dynamicsystem.nyquist.html

If you like more plot customization options, then use nyquistplot() command:

https://www.mathworks.com/help/ident/ref/dynamicsystem.nyquistplot.html

%% The System

G = tf(3, [1 2 3])

G = 3 ------------- s^2 + 2 s + 3 Continuous-time transfer function.

%% Nyquist Plot

nyquist(G), grid on