The Gearbox Fault Diagnosis Based on Wavelet Transform

Abstract

The main gearbox is an important driving force for a pump. It needs to carry out regular monitoring. In this paper, it measures the vibration acceleration signal of a pumping unit's main gearbox, names them 1# and 2#. After comparing the time course curve and spectral of the two main gearbox, it has found the 2# gearbox's maximum amplitude is about 2.5 times than the 1#, and the frequency which corresponds to the spectral value is close to the meshing frequency. The narrowband signals are filtered by Hilbert transform to obtain the envelope of the narrow band signal. The envelope signals are significant different between the two gear boxes, 1# gearbox has more spectrum of frequency, and 2# gearbox is more outstanding single frequency component. The results show that the presence of the 2#gearbox has some minor faults. So does the oil analysis show. The 2# gearbox is more wear than 1# gearbox, which explains the rationality of the vibration analysis.