curve fit on a bode plot

Discussion in 'Homework Help' started by suzuki, Dec 9, 2011.

  1. suzuki

    Thread Starter Member

    Aug 10, 2011
    119
    0
    Im aware you can estimate the transfer function of a bode plot by hand, but for many different FR's, i think an "automated" process would be more accurate and less time consuming.

    Does anyone have any "faster" ways to find the transfer functions of a given bode plot? Most preferably, is there a way in matlab to accept frequency response data and then have Matlab do a curve fitting?

    TIA
     
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    There are Matlab functions such as "fitfrd" which fit frequency response data to a state-space model. But you need the right toolbox.

    Alternatives to Matlab such as Scilab have just such a function "frfit" and/or "frep2tf" inbuilt - all for free.
     
    Last edited: Dec 9, 2011
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