Gearbox fault diagnosis based on frame decomposition

Frame decomposition is flexible in representing arbitrary signals, and thereby is effective in matching the characteristic structure of and extracting the time-frequency features directly. It is applied to analyzing the gearbox vibration signals under healthy and faulty statuses. Based on a wavelet frame, the periodic impulses characteristic of localized damaged gear vibration are extracted in joint time-frequency domain, and the localized gear damage is detected and located. The analysis validates the effectiveness of frame decomposition in fault diagnosis of gearboxes.