Damage Identification of Structures Based on Smooth Orthogonal Decomposition and Improved Beetle Antennae Search Algorithm

Table 3

Comparison of structural frequencies of the simply supported beam.

Damage case	Noise level	Mode	Structural frequency
			Theory	FEM	SOD
Single damage	Without noise	1	24.18	24.14	24.14
		2	97.97	97.20	97.20
	0.2%	1	24.18	24.14	24.14
		2	97.97	97.20	97.29
	0.5%	1	24.18	24.14	24.12
		2	97.97	97.20	97.15
No damage	Without noise	1	24.54	—	—
		2	98.74	—	—