MATLAB: How to design an Uncertain State Space block (more) in Simulink with two values varying

Robust Control Toolboxsimulink

My transfer function is: g(s)=(5.6±7.1)/((9.3±0.5)*s+1), with the gain (k) and time constant (tau) varying in the expression.

I am struggling to have these varying numbers within my simulation. I have yet to perform any type of linearization or optimization yet in my process control course.

Thank you

Best Answer

tau=ureal('tau',9.3);
tau.PlusMinus=[-0.5 0.5];
k=ureal('k',5.6);
k.PlusMinus=[-7.1 7.1];
sys=k*tf(1/tau,[1 1/tau]);

HTH

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MATLAB: How to solve a linear system with component varying

Here is one way to do it;

index = 0;
S = -2:0.01:2;
for i = 1:length(S)
      index = index+1;
      s_val = S(i);
      R = 1.5*(1-s_val)/s_val;
      y = [380/sqrt(3); 0];
      A = [.45+.8i+25i -25i;-25i 1.5+1.5i+25i+R];
      x = A\y;
      I1(index) = x(1);
      I2(index) = x(2);
      P(index) = 3*1.5*((1-s_val)/s_val)*abs(I2(index));
end
plot(S,P)

MATLAB: Creating 4D vector inside parfor

The approach you use in your second code is correct.

Best Answer

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