ind_frf_fit_c


Purpose

Synthesize FRFs using supplied natural frequency and damping. Modal mass and mode shapes unknown. Complex mode shapes assumed.

Syntax

[fsyn,st] = ind_frf_fit_c(f,sproto,flim,residuals);

Description

IND_FRF_FIT_C 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 complex modes.

INPUTS:

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)

OUTPUTS:

FSYN = Synthesized FRF
ST = Calculated complex 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.

Examples

>> [fsyn,st]=ind_frf_fit_c(f,sproto,freqrange,residuals)

See Also

frf_fit, ind_frf_fit, frfsyn