Joint Amplitude and Frequency Demodulation Analysis Based on Variational Mode Decomposition for Multifault Diagnosis of a Multistage Reducer

Table 1

Simulation signal parameters.

Meshing frequency of planetary gear		648
Meshing frequency of spur gear 1		188
Meshing frequency of spur gear 2		68
Rotation frequency of planet carrier		6.5
Characteristic frequency of spur gear fault		1.9
Characteristic frequency of the sun gear fault		23
AM coefficient of path ii		0.03
AM coefficient of path vi		0.03
AM coefficient of the sun gear fault		1
FM coefficient of the sun gear fault		2
AM coefficient of paths 1 and 3		0.03
AM coefficient of paths 4 and 5		0.03
AM coefficient of the paths to the vibration signal of spur gear 1		0.09
AM coefficient of the paths to the vibration signal of spur gear 2		0.06
AM coefficient of the spur gear fault		1
FM coefficient of the spur gear fault		1.5