Use logarithms to separate the frequency response into a sum of decibel terms, where w=0 to find the starting magnitude.

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Salik Mallick 2020-4-15

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回答： Rhea Chandy 2021-5-7

Is there a function to find the gain?

6

H(s)= ----------------------------------------

s^5 + 22 s^4 + 164 s^3 + 458 s^2 + 315 s

code:

h=tf(num,den4)

[gm pm wcp wcg]=margin(h)

km=10*(gm/20)

wm=wcp

kp=0.6*km

ki=(kp*wm)/pi

kd=(kp*ki)/(4*wm)

h1=tf([1,0],[1])

g=(kp+(kd*h1)+(ki/h1))*h

bode(g)

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Rhea Chandy 2021-5-7

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Hi, I understand you want to find the gain of your transfer function.

Consider using the Zero-pole-gain model , zpk, to convert your dynamic system models to zero-pole-gain form. You can access the gain data with zpkdata .

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