Evaluation on Filter Performance of Variational Mode Decomposition and Its Application in Separating Closely Spaced Modes

Table 1

The identified modal parameters.

γ	Order	SNR = 20 dB				SNR = 10 dB
		f (Hz)	Error (%)	ζ (%)	Error (%)	f (Hz)	Error (%)	ζ (%)	Error (%)
0.5	1	14.24	0.02	1.01	0.97	14.24	0.05	1.02	2.12
	2	28.50	0.09	1.49	0.69	28.45	0.07	1.50	0.23
0.6	1	14.23	0.01	1.00	0.44	14.23	0.02	1.04	3.91
	2	23.72	0.01	1.47	2.07	23.74	0.06	1.54	2.67
0.7	1	14.24	0.02	1.00	0.09	14.23	0.02	0.98	2.04
	2	20.34	0.02	1.51	0.63	20.35	0.05	1.48	1.21
0.8	1	14.23	0.01	1.01	1.42	14.23	0.02	0.96	3.58
	2	17.81	0.10	1.47	2.31	17.82	0.13	1.44	3.89
0.9	1	14.25	0.10	1.02	2.43	14.24	0.00	1.05	4.56
	2	15.81	0.04	1.54	2.86	15.82	0.03	1.45	3.26

f denotes the modal frequency and ζ denotes the damping ratio.