Finding the ramp response to a transfer function

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Aleem Andrew 2021-3-17

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/775897-finding-the-ramp-response-to-a-transfer-function

评论： Mathieu NOE 2021-3-18

采纳的回答： Mathieu NOE

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If T is the transfer function defined below, how do you find the ramp response?

G = tf(poly([-2 -3]),poly([0 -1])); T=feedback(G,1)

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Answer 1

Mathieu NOE 2021-3-17

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https://ww2.mathworks.cn/matlabcentral/answers/775897-finding-the-ramp-response-to-a-transfer-function#answer_650612

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You can use lsim function for any input

t=0:0.01:10
slope = 2;
ramp=slope*t;         % Your input signal
G = tf(poly([-2 -3]),poly([0 -1])); T=feedback(G,1);    % Your transfer function
[y,t]=lsim(G,ramp,t);
plot(t,y)

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Aleem Andrew 2021-3-17

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Thank you for your answer. Can you use lsim for a step input? I get an error message when I do so.

t=0:0.01:10;
slope = 2;
ramp=1;         % Your input signal
G = tf(poly([-2 -3]),poly([0 -1])); T=feedback(G,1);    % Your transfer function
[y,t]=lsim(G,ramp,t);
plot(t,y)

Mathieu NOE 2021-3-18

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hello

sure, but whatever the type of input signal, its dimensions must be the same as time vector (t)

I also changed the name of the input to avoid any confusion (it's not a ramp anymore)

so this is the correct code :

t=0:0.01:10;
mystep=1*ones(size(t));         % Your input signal
G = tf(poly([-2 -3]),poly([0 -1])); T=feedback(G,1);    % Your transfer function
[y,t]=lsim(G,mystep,t);
plot(t,y)

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