Modal Parameter Identification from Output Data Only: Equivalent Approaches

Table 1

Natural eigenfrequencies and damping factors of the experimental beam.

Modes	Theoretical eigenfrequencies   (Hz)	Identified eigenfrequencies   (Hz)	Relative error on eigenfrequencies (%)	Identified damping factor (%)
1	24.13	24.17	0.16	1.06
2	150.81	150.58	−0.15	0.13
3	422.29	419.72	−0.61	0.04