Research Article
Perspectives of Second-Order Blind Identification for Operational Modal Analysis of Civil Structures
Table 2
Test cases, modal identification results, and comparisons.
| | Case study | Characteristics | | ( Hz, ) | Mode number | Hz | Hz | % | % | MAC |
| | 6-DOF system | Simulated data | 6 | (10, 400) | I | 1.51 | 1.51 | 0.97 | 1.00 | 0.998 | | II | 2.82 | 2.82 | 0.73 | 0.80 | 0.999 | | III | 3.81 | 3.81 | 0.88 | 0.81 | 0.999 | | IV | 4.73 | 4.74 | 0.81 | 0.87 | 0.998 |
| | Tower of the Nations (Naples) | Well-separated modes | 8 | (5, 360) | I | 0.81 | 0.81 | 0.36 | 0.40 | ≈1 | | II | 1.38 | 1.38 | 0.97 | 1.17 | ≈1 | | III | 1.66 | 1.66 | 0.69 | 0.63 | ≈1 |
| | School of Engineering (Naples) | Closely spaced modes | 12 | (10, 400) | I | 0.92 | 0.92 | 1.23 | 1.32 | ≈1 | | II | 0.99 | 0.99 | 1.17 | 1.02 | 0.999 | | III | 1.30 | 1.30 | 0.58 | 0.64 | ≈1 |
| | S. Maria del Carmine Bell Tower (Naples) | Closely spaced modes, noisy data | 12 | (5, 300) | I | 0.70 | 0.70 | 0.96 | 0.92 | ≈1 | | II | 0.76 | 0.76 | 0.92 | 0.83 | ≈1 |
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