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

Table 5

Comparison of structural frequencies of the cantilever beam.

Damage case	Noise level	Mode	Structural frequency
			Theory	FEM	SOD
Double damage	Without noise	1	8.61	8.62	8.62
		2	54.06	53.99	53.98
	0.2%	1	8.61	8.62	8.61
		2	54.06	53.99	53.97
	0.5%	1	8.61	8.62	8.61
		2	54.06	53.99	53.94
No damage	Without noise	1	8.72	—	—
		2	54.75	—	—