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A novel acoustic emission location approach was presented for large anisotropic composite plates with unknown lay-up and wave velocity. The proposed algorithm was based on the differences of acoustic emission signals measured by four piezoelectric sensors surface-bonded in a small area. Wavelet scale spectrum combined with cubic splines interpolation was employed to obtain the time of arrivals (TOA)...
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...
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