Feature Extraction Using Discrete Wavelet Transform for Gear Fault Diagnosis of Wind Turbine Gearbox

Table 2

DWT 3 level frequency bands.

Approximations “”	Frequency band (kHz)	Details “”	Frequency band (kHz)
	(0–1.6)		(1.6–3.2)
	(0–3.2)		(3.2–6.4)
	(0–6.4)		(6.4–12.8)