Since I am using MATLAB for modal parameter extraction purpose. So I just to know the built-in function RFP in MATLAB.
Nikhil Donadkar
If you have FRF data , invfreqs command will extract a's & b's coeffiecients & finally residue command will extract poles & residues.
[A,B] = invfreqs(frf(1:N),wi,n,n,wt,iter,tol);
[Residues,Poles,K] = residue(A,B); % Residues & Poles, respectively
%--- Calculating the Natural Freq & Damping Ratio ---%
Damp_ratio = -real(Poles)./(abs(Poles));
% Here the natural frequency is multiplied by
% the maximum in because the frequencies were
% scaled from 0 to 1 to avoid problems in
% the invfreqs function
Nat_Frequency = abs(Poles)*max(w)/(2*pi);
This is the shortest possible code i can suggest.
Hope it helps even if it's late.
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