Research Article
Experimental Investigations of Damage Identification for Aluminum Foam Sandwich Beams Using Two-Step Method
Table 3
Numerical solution of the first 4 natural frequencies of each case.
| Case | Modal order | 1 | 2 | 3 |
| 1 | 97.636 | 447.85 | 973 | | 0.498% | 9.749% | 11.580% | 2 | 97.631 | 447.81 | 972.89 | | -0.005% | -0.009% | -0.011% | 3 | 97.621 | 447.73 | 972.63 | | -0.015% | -0.027% | -0.038% | 4 | 97.634 | 447.82 | 973 | | -0.002% | -0.007% | 0.000% | 5 | 97.629 | 447.77 | 972.99 | | -0.007% | -0.018% | -0.001% | 6 | 97.624 | 447.73 | 972.88 | | -0.012% | -0.027% | -0.012% |
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