how to add disturbance factor ?

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HASSAN
HASSAN 2016-3-22
评论： Sachin Kumar 2023-3-29
I have to add a disturbance factor after 400 sec when my system is stable in order to check the stability while using PID controller. Disturbance factor is Aexp(-Bt). what i have to do ??

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回答（2 个）

Azzi Abdelmalek
Azzi Abdelmalek 2016-3-22
  • Use these a clock block to generate a time t,
  • multiply the time t by a constant -B,
  • pass the output -B*t through a Math function block (choose exp function),
  • multiply the output by A
  1 个评论
HASSAN
HASSAN 2016-3-25
Dear, I have done this thing already, as for as i have my understanding it will show the run time value but i want to add it after 400sec one thing. Another problem is that there is another time t parameter in my mathematical model both will be the same as you have mentioned idea to use for disturbance ??

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Toby Russell
Toby Russell 2020-8-23
How would one do this in code? ie not using simulink
if I wanted to add a disturbance at 40 seconds to a system model in order to test the controller?
live script code
s=tf('s')
K = 2;
tau = 3;
sysmod = exp(-s)*(K/(tau*s+1))
plot (time,response,'g');
hold on
step (sysmod,'k')
title ('System Model Step Response')
hold off
Applying the Hagglund-Astrom Tuning
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
haggast1 = feedback((kp + (ki/s))*sysmod,1); % Applying the Hagglund-Astrom tuning
step (haggast1,'g')
hold on
step (sysmod,'k')
%step (haggast1,40)
title ('Haggland-Astrom Tuning')
legend ('haggast1','sysmod')
hold off
  1 个评论
Sachin Kumar
Sachin Kumar 2023-3-29
Dear same problem i am facing if you have done this thing. Could you please help me to solve it out?

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