Structural Health Monitoring Based on Combined Structural Global and Local Frequencies

Table 5

The errors of lower order natural frequencies of global structure.

Order	Identified	Theoretical	Error
1	18.4	18.82	2.28%
2	27.6	27.25	−1.25%
3	36.8	38.63	4.97%
4	53.3	50.34	−5.55%