Nonlinear Vibration Feature Recognition Method for Reciprocating Compressor Cylinder Based on VMD-Multifractal Spectrum

Table 7

Center frequencies under different K values.

K	Center frequency
K = 2	2355	5867
K = 3	2334	5294	6798
K = 4	1890	4440	5905	8024
K = 5	1749	3951	5569	6503	8782
K = 6	1637	3318	4991	5971	7817	9697
K = 7	1603	2982	4409	5671	6518	8073	9966