Research on Fault Evolution Feature Extraction and Identification of Sun Gear Cracks in Planetary Gearbox Based on Volterra High-Order Kernel Generalized Frequency Response Graphic Analysis

Table 2

Planetary gearbox configuration parameters II.

Parameter	Meshing frequency	Failure frequency of sun gear /Hz	Transfer frequency of planet carrier /Hz	Pressure angle
	/Hz			/(°)
Digital quantity	216	12	3	20