Re: How can I fix the error that produces this peak in Bode plot?
Doug Stewart <[email protected]>
| Newsgroups | gmane.comp.gnu.octave.general |
|---|---|
| Message-ID | <CAAohRsbaRDCybT0aiibUHAy5aJDF=+Q=4FH5sP8+wt8NJJ9i4A@mail.gmail.com> |
On Wed, Oct 14, 2020 at 8:19 AM Doug Stewart <[email protected]> wrote: > > > 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. > > > Did you get it working? Doug -- DAS[image: Certificate for 206392] <https://linuxcounter.net/user/206392.html>