Application of Reassigned Wavelet Scalogram in Wind Turbine Planetary Gearbox Fault Diagnosis under Nonstationary Conditions

Table 3

Planetary gearbox characteristic frequencies.

Frequency	Stage 1	Stage 2
Meshing	(100/27)	(175/216)
Sun rotating	(2/9)	(1/27)
Planet carrier rotating	(1/27)	(7/864)
Sun fault	(20/27)	(175/1512)
Planet fault	(5/54)	(175/7776)
Ring fault	(4/27)	(175/5400)