326 P. A. Kerrian Fig. 34.4 CMIF of all references and responses for the free-free impact test Table 34.1 Comparison of FEM and test free-free modal frequencies and predicted FB frequencies Mode Test freq. (Hz) Damping (% cr) Description FEM freq. (Hz) FEM FB freq. (Hz) 1 269.07 1.16 1st bending 295.32 55.74 2 271.75 1.04 1st bending 295.78 55.75 3 565.68 0.94 Torsion 883.22 857.04 4 605.73 2.32 2nd bending 696.96 520.55 5 619.82 2.09 2nd bending 697.94 521.3 6 863.76 1.45 Plunge 935.72 702.88 7 1261.64 1.14 Breathing mode 1380.13 1380.3 8 Not well measured Breathing mode 1380.32 1380.21 9 1306.52 2.96 3rd bending 1537.18 1442.5 10 1310.75 2.823 3rd bending 1537.42 1452.81 Fig. 34.5 Plots of the free-free target modes
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