Figure 14. Auto-MAC of Final Autonomous Estimates - Conjugate Poles Table 2 is a summary of the modal frequency estimates and statistics for this case. Once again, this is discussed and detailed fully in another paper [26] and includes a discussion of the statistics for modal frequencies, modal vectors and modal scaling. Index Sample Size (N) Frequency (Hz) Damping (Hz) Std. Dev. (Hz) 3 19 7.406 -0.2405 0.0169 2 19 8.263 -0.2023 0.0165 21 14 9.465 -0.9698 0.2536 8 19 11.252 -0.6154 0.1868 35 6 12.224 -0.6670 0.0182 32 8 12.756 -0.3508 0.0295 11 17 13.162 -0.6191 0.0555 41 6 15.729 -0.5559 0.0294 30 10 15.765 -0.5065 0.0373 6 19 16.748 -0.5607 0.0282 43 4 18.221 -0.6022 0.1169 16 13 20.099 -0.4817 0.0501 37 4 20.323 -0.3616 0.0476 14 16 20.507 -1.1594 0.1925 39 5 21.236 -1.0540 0.1930 31 5 21.623 -1.5995 0.2917 25 10 22.778 -0.7754 0.0856 28 10 24.247 -0.6433 0.0238 9 17 25.235 -0.8777 0.0452 18 14 27.824 -1.0211 0.0749 23 8 28.151 -0.7365 0.1076 22 9 29.492 -0.4654 0.1662 TABLE 2. Bridge Example: Modal Frequency Statistics Mode Frequency, Hz Mode Frequency, Hz Auto−MAC of Reference File 7.39 8.25 12.23 12.76 13.15 15.77 16.73 20.12 22.74 24.25 25.23 29.48 −29.48 −25.23 −24.25 −22.74 −20.12 −16.73 −15.77 −13.15 −12.76 −12.23 −8.25 −7.39 7.39 8.25 12.23 12.76 13.15 15.77 16.73 20.12 22.74 24.25 25.23 29.48 MAC Value 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 414
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