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Re: How can I fix the error that produces this peak in Bode plot?

From: Doug Stewart
Subject: Re: How can I fix the error that produces this peak in Bode plot?
Date: Wed, 14 Oct 2020 08:19:46 -0400

On Wed, Oct 14, 2020 at 8:11 AM Beginner1 via Help-octave <> wrote:

With regard to that zero at +13333.33, I am not familiar with rlocus, but I
have plotted it without finding this zero at +13333 in the plot that would
make the system unstable I guess, if located on the right side of the plane.
Attached I send the plot. Anyway, I also wrote the command [r,k] =
rlocus(sys_1_vd), to see the exact numerical value of the roots, but did not
find any +13333.33 location.

On the other hand,  by obtaining the eigenvalues of the system, they all
have negative real part, except for 2 with a very small positive real part,
which it may be due to inaccuracies of the calculation. But I think, this
has no relationship with the zero you have pointed out to be located at
 -757.69960 +    0.00000i
  -1487.09047 +    0.00000i
    -28.89898 +  318.89945i
    -28.89898 -  318.89945i
    -25.27902 +  323.48505i
    -25.27902 -  323.48505i
     -0.00207 +  314.16966i
     -0.00207 -  314.16966i
      0.01004 +  314.15586i
      0.01004 -  314.15586i
     -0.00797 +  314.15227i
     -0.00797 -  314.15227i

How can I see this zero at +13333.33?


This will convert your transfer function  to num/den form then looks at the roots of the numerator.  

DASCertificate for 206392

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