Third-order spectral characterization of acoustic emission signals in ring-type samples from steel pipes for the oil industry

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• 作者：Juan José ; Gonzá ; lez de la Rosa ; Rosa Piotrkowski ; José ; Ruzzante
• 关键词：Acoustic emission (AE) ; Bi-spectrum ; Frequency domain analysis ; Higher-order statistics (HOS) ; Non-destructive testing (NDT) ; Time-frequency analysis ; Vibration analysis
• 刊名：Mechanical Systems and Signal Processing
• 出版年：2007
• 出版时间：May 2007
• 年：2007
• 卷：21
• 期：4
• 页码：1917-1926
• 全文大小：472 K

文摘

Third-order cumulant spectra are used to characterize acoustic emission events in ring-type samples from steel pipes for the oil industry. A cut segment of chord allows the coupling between a sample and the mechanical excitation device. Diagonal bi-spectrum allows the separation of the primary (original) deformation from the reflections produced mainly in the suppressed chord. These longitudinal reflections can hardly be extracted via second-order methods, e.g. wavelet packets and power spectra, because they are partially masked by both Gaussian and non-Gaussian noise. Sample registers were acquired by wide frequency-range transducers (100–800 kHz) and digitalized by a 2.5 MHz, 8-bit ADC.