72 S. Richardson et al. Fig. 8.1 Jim beam structure Fig. 8.2 Imaginary part of 99 FRFs overlaid The FRFs were then curve fit using a least-squared-error curve fitting method to estimate the modal parameters for the ten modes. These parameters are listed in Fig. 8.3. An FEA model was also created from the Jim Beam photo model [1], and it was solved for its FEA mode shapes, or eigenvalues and eigenvectors. The FEA mode shapes are listed in Fig. 8.4. The Jim Beam FEA model was meshed to provide more DOFs before solving for its FEA modes. Hence, the FEA mode shapes had 630 DOFs in them, but only 99 matched with the DOFs of the EMA mode shapes. By comparing the shape component values in Figs. 8.3 and 8.4, it is clear that the EMA shapes have different values in them than the FEA shapes.
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