Synthesize FRFs using supplied natural frequency and damping. Modal mass and mode shapes unknown. Real mode shapes assumed.
fsyn,st=ind_frf_fit(f,sproto,flim,residuals);
IND_FRF_FIT solves for the residues for each individual FRF based on the frequency and damping modal parameters supplied in SPROTO. The output FSYN contains the synthesized FRFs corresponding to the input function F, and the optional output ST contains mode shapes.
F = imat_fn containing FRF
SPROTO = imat_shp containing natural frequency and damping values. No other part of the shape is used in the FRF synthesis
FLIM = 1 x 2 matrix containing
the frequency limits used in the synthesis.
RESIDUALS = 1 x 2 matrix defining
whether or not residuals are used.
1= used, 0 = not used
RESIDUALS(1) = Lower
Residual which is a mass line (proportional to 1)
RESIDUALS(2) = Upper
Residual which is a stiffness line (proportional to 1/s^2)
FSYN = Synthesized FRF
ST = Calculated real mode shapes. For multiple
references, calculated mode shape
for each set of modal parameters (frequency and damping) is taken from
the reference that produces the largest residue vector.
>> [fsyn,st]=ind_frf_fit(f,sproto,freqrange,residuals)