matlab question response question

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johnaly7 2014-3-13

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编辑： johnaly7 2014-7-21

I have a control system with a PID controller, and im trying to simulate a system response, i need to plot the values first in a graph and then add the transfer function?

this is what i have found and im doing:

dt = 0.1; t = 0:dt:50; u = zeros(1,numel(t)); u(t<=20) = 45; u(t> 20 & t<=40) = -45; u(t> 40) = 0;

obviously with the lsim command

Is there a better way ?

Thanks in advance

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Answer 1

Mischa Kim 2014-3-14

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编辑：Mischa Kim 2014-3-14

在 MATLAB Online 中打开

John, you just need to build the signal (no need for plotting), e.g.,

 dt = 0.1;                % adjust as necessary
 t  = 0:dt:50;
 u  = zeros(1,numel(t));
 u(t<=20)         =  45;  % you probably want to use rad instead of deg
 u(t> 20 & t<=40) = -45;
 u(t> 40)         =   0;

and feed it as an input to the system.