Structural Health Monitoring Based on Combined Structural Global and Local Frequencies

Table 2

The errors of lower order natural frequencies of global structure.

Order	Experimental	Theoretical	Error
1	18.4	23.27	26.47%
2	27.6	34.41	24.67%
3	36.8	52.58	42.89%
4	53.3	76.97	44.41%