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Homework Help: Determine the range of K that keeps the system stable

  1. Dec 31, 2012 #1
    1. The problem statement, all variables and given/known data

    i meet problem below in control system :

    G(s)= K(s+4)/s(s+1)(s+2) its a unity feedback system.

    1. determine the range of K that keeps the system stable.
    2. determine the range of K that makes the system oscillate
    3. calculate the frequency of oscillation when the system oscillate

    2. Relevant equations

    characteristic equation for stability Routh Hurwitz Creation

    3. The attempt at a solution

    i have solved the first by determine the range of K by using Routh Hurwitz Table. But, i m very confused when it comes to find the range of K that makes system oscillate. even, i dont understand the term for oscillate. conclusion number 2 and 3 is very confusing.
  2. jcsd
  3. Dec 31, 2012 #2

    rude man

    User Avatar
    Homework Helper
    Gold Member

    Is G(s) the forward gain with unity feedback? Good idea is to draw us a block diagram.
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