Transfer function for feedback control

Discussion in 'Homework Help' started by Durzo972, Mar 7, 2013.

  1. Durzo972

    Thread Starter New Member

    Nov 16, 2012
    8
    0
    Hello,

    I have a transfer function Y(s)/X(s) = G/(1+GH) H = 0.5,G not given and a step input going into the system and want to see the steady state output when G goes to infinity. Is this the proper way of doing it?

    Y(s) = (1/s)*(infinity/(1+infinity*0.5))
    = (1/s)*(infinity/infinity)
    = 1/s

    Thanks.
     
  2. ramancini8

    Member

    Jul 18, 2012
    442
    118
    Y(s)=(1/s)(1/H)
     
  3. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    That's not the correct approach. First divide the generic TF [Y(s)/X(s) = G/(1+GH)] top & bottom (i.e. numerator & denominator) by G first, then allow G to tend to infinity.
     
    Last edited: Mar 10, 2013
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