-360 -180 0 Drive Point FRFs 301z Phase [deg] 102 103 10-1 100 101 102 103 104 105 FRF magnitude [in s-2 lb-1] Frequency (Hz) Analytical Exper-CMS Trunc. Exper-CMS All Figure 7: FRF of Cylinder-Plate system described in [2] including all modes of the Cylinder+Transmission simulator (“All”) and after eliminating modes 19-22 and 26 (“Trunc.”). -360 -180 0 Drive Point FRFs 301z 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 100 101 102 103 104 105 Analytical Exper-CMS Trunc. Exper-CMS All Figure 8: Zoom view of Fig. 7 showing the high frequency region where the substructuring predictions are seen to degrade when modes 19-22 and 26 are excluded from the cylinder model. 3.2.2. Ranking modes of A For this case the same subcomponents C and A will be used once again with 100 and 18 modes respectively, only now we shall see how the modes of A contribute to the negative eigenvalues. The eigenvalues of QAM W T W ˆm A are the same as those of CM Q . Following the 130
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