Experimental Investigations of Damage Identification for Aluminum Foam Sandwich Beams Using Two-Step Method

Table 6

Natural frequencies (Hz).

Case	Modal order
	1	2	3
Case 1	46.235	401.914	940.478
Case 2	55.038	393.532	944.937
Case 3	54.425	387.310	881.190
Case 4	54.920	394.745	937.192
Case 5	54.499	379.999	883.446
Case 6	54.378	377.751	870.759