I am using Matlab 7.0 plus most of the toolboxes. I have some
experiemtally obtained transfer funtions of a previous experiement.
This experiment imparts a random vibration on one location on a
structure and senses acceleration at another location. I would like
to extract the modal residues, damping ratios and natural frequencies
from these experimental transfer funtions. I have looked through the
System Identification toolbox but nothing seems to perform this
function. I would appreciate any help.
Patrick Roberts
Dept. of Aerospace Engineering
Georgia Tech
Determining residues, damping and natural frequency from experimental TF
Started by ●September 14, 2005
Reply by ●September 15, 20052005-09-15
Try using the residue function. If your transfer function is 2nd order
(s^2 is the highest power term in the denominator of the laplace domain
transfer function), its simple to determine the damping freq and damping factor.
The denominator in a standard 2nd order system is of the form
s^2+2*zeta*wn*s+wn^2, please check it in a standard control theory
book.
Premal
gt0398b <g...@cad.gatech.edu> wrote:
gt0398b <g...@cad.gatech.edu> wrote:
I am using Matlab 7.0 plus most of the toolboxes. I have some
experiemtally obtained transfer funtions of a previous experiement.
This experiment imparts a random vibration on one location on a
structure and senses acceleration at another location. I would like
to extract the modal residues, damping ratios and natural frequencies
from these experimental transfer funtions. I have looked through the
System Identification toolbox but nothing seems to perform this
function. I would appreciate any help.
Patrick Roberts
Dept. of Aerospace Engineering
Georgia Tech
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