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Math Forum » Discussions » Software » comp.soft-sys.matlab

Topic: transfer functions
Replies: 1   Last Post: Jul 16, 1997 11:22 PM

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Ole Morten Damlien

Posts: 4
Registered: 12/7/04
transfer functions
Posted: Jul 16, 1997 6:42 AM
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I've recently tried to find coefficients for a simple, linear model like

my''+ cy' + ky = ax, where

y is output, x is input and m, c, k and a are constants.


From Bendat & Piersol one learns that
a
H(f)= ----------------------------- ,
k - (2*pi*f)^2 + i*2*pi*f*c

for a unit impulse.

From experiments I have H(f), I want to find a,k and c.

In matlab there is a toolbox for control systems, and there is for
instance a function called tf.

Is there anyone who knows if it is possible to convert a transfer
function numerically, either as a complex vector or as a magnitude and
phase vector, to a denominator and numerator which describes i.e. the
state space model in the mentioned toolbox?
--
Ole M. Damlien
Parkveien 14
5007 Bergen

Tlf. 55 903442
Ole.Damlien@gfi.uib.no





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