Application of Variational Mode Decomposition and k-Nearest Neighbor Algorithm in the Quantitative Nondestructive Testing of Wire Ropes

Table 1

SNR of several denoising algorithms.

Group	Raw signal (dB)	EWT algorithm (dB)	HHT-WFCS algorithm (dB)	EEMD-wavelet algorithm (dB)	Proposed algorithm (dB)
1	35.31	54.76	58.88	54.51	82.26
2	32.17	48.53	50.14	69.64	93.31
3	32.62	47.14	45.33	58.34	99.89
4	27.46	43.12	48.36	65.04	98.93
5	22.91	44.44	51.16	47.69	70.87
6	18.03	37.16	38.89	58.64	92.36
7	26.41	55.28	48.24	62.84	86.64
8	26.68	38.15	48.13	47.08	93.18
9	30.17	49.12	48.58	49.93	73.05
10	30.83	57.28	50.18	67.28	85.48