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Homework Help: Control theory

  1. Oct 21, 2007 #1
    1. The problem statement, all variables and given/known data

    I have a transfer function [itex]G(s) = \frac{1}{s^2}[/itex] and a PI controller [itex]P(s) = 6 \left( 1 + \frac{1}{s} \right)[/itex].

    How do I check for stability? Just use 1 + P(s)G(s) = 0 and check the roots?
  2. jcsd
  3. Oct 23, 2007 #2


    User Avatar

    Yes, if all the roots have a negative real part the system is stable.
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