square is the indvidual standard deviations for the frequency and the damping. The blue circle is the pole as estimated from the pole weighted (state extended) vector. 7.8 8 8.2 8.4 8.6 8.8 −0.7 −0.6 −0.5 −0.4 −0.3 −0.2 −0.1 0 0.1 0.2 Frequency [Hz] Damping [Hz] Pole Cluster (N = 19) 9 9.2 9.4 9.6 9.8 10 −1.4 −1.3 −1.2 −1.1 −1 −0.9 −0.8 −0.7 −0.6 −0.5 Frequency [Hz] Damping [Hz] Pole Cluster (N = 14) Figure 10. Bridge Example: 8.3 Hz and 9.5 Hz Pole Clusters - Statistics As in the circular plate example, again note that the scaling in Figures 10 and 11 is consistent so that larger diameter circles will represent more variability. 10.6 10.8 11 11.2 11.4 11.6 11.8 −1.1 −1 −0.9 −0.8 −0.7 −0.6 −0.5 −0.4 −0.3 −0.2 −0.1 Frequency [Hz] Damping [Hz] Pole Cluster (N = 19) 17.6 17.8 18 18.2 18.4 18.6 18.8 −1.1 −1 −0.9 −0.8 −0.7 −0.6 −0.5 −0.4 −0.3 −0.2 Frequency [Hz] Damping [Hz] Pole Cluster (N = 4) Figure 11. Bridge Example: 11.3 Hz and 18.2 Hz Pole Clusters - Statistics 396
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