How to put a impulse disturbance in a control signal of a simulink model?

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Pramit Biswas 2013-8-28

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https://ww2.mathworks.cn/matlabcentral/answers/85777-how-to-put-a-impulse-disturbance-in-a-control-signal-of-a-simulink-model

评论： Shrinivas Iyengar 2021-6-10

I want to give disturbance(not random) automatically in to system.

Say, 5 unit impulse

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Answer 1

Azzi Abdelmalek 2013-8-28

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https://ww2.mathworks.cn/matlabcentral/answers/85777-how-to-put-a-impulse-disturbance-in-a-control-signal-of-a-simulink-model#answer_95296

Use a pulse generator block

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Toby Russell 2020-8-24

how do you do it in pure code in mat lab?

trying to add disturbance at 40 seconds in this code, but its not working properly...

it is supposed to be a step disturbance at 40 seconds then return to 1

theta = 0.27; % Defines the dead time in the process

kp = (0.14/K)+((0.28*tau)/(theta*K)) % Defines the Proportional element CORRECT

ki = ((0.33*theta) + ((6.8*theta*tau)/(10*theta+tau))) % Defines the Integral element CORRECT

G_disturbance = (exp(-40*s)*(1))

haggast1 = feedback ((kp + (ki/s)) * sysmod,1); % Applying the Hagglund-Astrom tuning

%haggast1 = feedback K*(1+(ki/kp)/s) * sysmod,1);

step (haggast1,'g')

hold on

step (sysmod,'k')

title ('Haggland-Astrom Tuning')

step (haggast1 + G_disturbance,'r',100) % Applying Disturbance

legend ('haggast1','sysmod','disturbance')

hold off

Applying the Cohen and coon PI Tuning

theta1 = 0.1;

kp1 = (1/K)*(tau/theta1)*(0.9+(theta1/(12*tau))) % Defines the Proportional element CORRECT

ki1 = (theta1*(30+(3*(theta1/tau))) / (9+(20*(theta1/tau)))) % Defines the Integral element CORRECT

CC = feedback ((kp1 + ki1/s) * sysmod,1); % Applying the Cohen Coon tuning

step (CC,'g')

hold on

step (sysmod,'k')

title ('Cohen Coon Tuning')

legend ('CC','sysmod')

hold off

Shrinivas Iyengar 2021-6-10

Did you end up finding how do you add distrubance to a system in MATLAB code? I have a tunable PID that I tuned with systune. I have connected all the system blocks with the connect function. I would like to add an input disturbance, and see its step response. I can do this easily in Simulink (and I can eve chose at what time period I want to add the disturbance). Is it possible to do this in MATLAB?

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