Modal Analysis Topics, Volume 3

0 50 100 150 200 250 0 2 4 6 8 10 12 Cluster Number Weighted Pole Cluster Size Principal Value Cluster Figure 25. Principal Values of Clusters of Pole Weighted Vectors 0 500 1000 1500 2000 2500 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Pole Surface Consistency Imaginary (Hz) Zeta (%) cluster pole & vector pole frequency conjugate non realistic 1/condition Figure 26. Pole Surface Consistency Clusters with Final Autonomous Estimates 421

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