Structural Damage Identification Based on Rough Sets and Artificial Neural Network

Table 4

Minimum property set 2 after reduction.

Damage case	Damage condition			Natural frequency			Second order strain mode
	Span	Position	Degree	1	2	3	1	⋯	12
1	2	1	5%	8.76	32.34	61.57	0.009	⋯	−0.006
2	2	1	10%	8.73	32.31	61.49	0.012	⋯	−0.006
⋯	⋯	⋯	⋯	⋯	⋯	⋯	⋯	⋯	⋯
684	13	3	95%	7.84	24.53	52.32	0.006	⋯	−0.036