How to find out z, p, and k of SISO transfer function of a plant
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Dear All, I need to apply zpk command upon my plant just like an attached photo. My plant is given as:
num=[4.16];
den=[1 0.82 0.69];
G=tf(num,den)
what are the z, p, and k for my plant just like in given mathworks example https://www.mathworks.com/help/control/examples/designing-pid-for-disturbance-rejection-with-pid-tuner.html
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Accepted Answer
Birdman
on 26 Oct 2017
In your example, the transfer function is defined from the zeros, poles and gain. In this case, zpk will return the same since the system is a second order system. Use the following lines instead:
z=roots(Gs.Numerator{1});
p=roots(Gs.Denominator{1});
k=Gs.Numerator{1};
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