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%