Modal Parameter Identification Based on Hilbert Vibration Decomposition in Vibration Stability of Bridge Structures

Table 2

Identification results for various signal-to-noise ratios (SNRs) with closely spaced modes.

SNR (db)	f1	f2	ξ1	ξ2
+∞	3.50	4.00	0.010	0.010
40	3.50	4.00	0.010	0.010
30	3.50	4.00	0.010	0.010
20	3.50	4.00	0.010	0.010
10	3.50	4.00	0.010	0.010

Note. ξ₁ and ξ₂ are the modal damping and f₁ and f₂ are the modal frequency.