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

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

> <https://octave.1599824.n4.nabble.com/file/t372684/rlocus.jpg>
>
> 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
> +13333.33.
>  -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?
>
>
>
>
>
>

[num,den]=tfdata(sys_1_vd,'v')
roots(num)

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


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