A Study on Defect Identification of Planetary Gearbox under Large Speed Oscillation

Table 2

Characteristic frequencies of the components in planetary gearbox.

Characteristics frequency	Expression
Meshing frequency of gear pairs 1-2 and 2-3
Rotational frequency of blue shaft
Meshing frequency of gear pair 4-5
Rotational frequency of grey shaft
Rotational frequency of yellow shaft
Meshing frequency of gear pair 6-7

is the rotational frequency of the red input shaft, that is, the rotational frequency of planet carrier.