398 M.K. Vakilzadeh et al. Fig. 37.5 Comparison of the first eight fixed-free mode shapes of the calibrated beam model and the baseline model MACD ˆ T S:ˆB 2 ˆ T S:ˆS ˆ T B:ˆB (37.18) Where S and B are the mode shapes of the baseline shell and beam model respectively. The calculated MAC values corresponding to pre- and post-calibration steps are illustrated in Fig. 37.6, respectively. Generally, large MAC values represent which baseline mode shape is related to which mode shape of the beam model. An average value of 0.89 for the diagonal MAC values shows the ability of the calibrated beam model to predict the mode shapes of baseline model. The figure also indicates a decoupling between torsional, edgewise and flapwise bending modes of the beam model that was not present in the nominal beam model.
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