Table 4.

Twelve modes and their associated modal and system parameters.

	Ω1	Ω2	Ω3	Ω4	Ω5	Ω6	Ω7	Ω8	Ω9	Ω10	Ω11	Ω12
Average f (Hz)	4.28	7.61	13.15	21.98	56.70	71.59	92.71	133.73	208.79	322.24	494.74	664.02
Minimum f (Hz)	3.00	4.70	10.00	18.75	51.18	62.90	82.40	113.67	158.44	263.10	411.67	604.17
Maximum f (Hz)	5.08	11.00	16.70	26.50	66.70	84.00	103.50	168.50	270.67	404.63	536.25	741.00
Standard deviation f (Hz)	0.42	0.34	0.71	0.71	1.69	1.91	4.66	4.34	6.40	8.99	11.94	16.08
Relative power (dB)	−12.5	−13.8	−12.4	−11.7	−0.3	−0.8	−1.4	−5.3	−10.1	−14.9	−17.8	−18.8
Amplitude cross-spectrum ((m/s2)2/Hz)	3.71 × 10−3	2.88 × 10−3	3.48 × 10−3	1.92 × 10−3	3.44 × 10−2	2.53 × 10−2	1.85 × 10−2	1.04 × 10−2	4.11 × 10−3	1.23 × 10−3	7.31 × 10−4	5.31 × 10−4
Phase (Radian)	0.87π	0.65π	0.75π	0.92π	0.87π	0.82π	0.73π	0.69π	0.59π	0.64π	0.60π	0.53π
Mode	OOP	Coupled	OOP	OOP	OOP	OOP	Coupled	Coupled	Coupled	Coupled	Coupled	Coupled
Coherence	0.93	0.90	0.89	0.94	0.99	0.99	0.98	0.99	0.97	0.96	0.95	0.95
Damping ratio	0.22	0.17	0.17	0.14	0.19	0.21	0.18	0.14	0.13	0.12	0.11	0.09
Number of samples	33	35	36	7	32	21	16	21	22	26	26	30