I need to add a disturbance factor 0.2 value after 500 sec ,when my system is stable in order to check the stability while using PID controller in MATLAB code . what to do ??

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sabavath jayaram 2023-2-28

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回答： Joel 2023-3-14

I have a closed loop transfer funtion with PID controller but i need to add a distrunabe value 0.2 after 500 sec in the output response to check disturbance rejection form the system. for that in MATLAB code what to do

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Answer 1

Joel 2023-3-14

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Hi,

I understand that you want to write MATLAB code to be able to add a disturbance at some given time while simulating your system and observe system dynamics. This can easily be done on Simulink using the step and transfer function blocks.

To achieve this in MATLAB, you should use the ‘lsim’ function. An example code is as follows:

TF = tf([1 3],[1 5 3]); % some transfer function
h = 0.001; % sample time
T = 1000; % simulation time
t = 0:h:T; % time samples
T_dist = 500; % time at which disturbance is introduced
t1 = 0:h:T_dist-h;
t2 = T_dist:h:T;
% divide the input signal into two parts. initial input of 1 is given at 0s and
% disturbance of 0.2 is given at 500s.
u = [ones(1,length(t1)),0.2*ones(1,length(t2))];
lsim(TF,u,t);