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Finding roots for a root locus

  1. Oct 5, 2014 #1
    Hi,

    In the attached image the roots are shown for the characteristic equation. I don't know how the roots were found. Anyone able to help?

    Thanks
    Splint

    Root locus.jpg
     
  2. jcsd
  3. Oct 10, 2014 #2
    When drawing the root locus you need the closed loop poles. So I'd suggest looking at the closed loop G(s).
     
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