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首页> 外文期刊>Mechanical systems and signal processing >Third-order spectral characterization of acoustic emission signals in ring-type samples from steel pipes for the oil industry
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Third-order spectral characterization of acoustic emission signals in ring-type samples from steel pipes for the oil industry

机译：石油行业的环形样品中声发射信号的三阶频谱表征

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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 (100-800k Hz) and digitalized by a 2.5MHz, 8-bit ADC.
机译：三阶累积量频谱用于表征石油行业钢管环形样品中的声发射事件。切下的和弦段允许样品和机械激励装置之间的耦合。对角双谱允许将主要（原始）变形与主要在被抑制的弦中产生的反射分离。这些纵向反射几乎不能通过二阶方法来提取。小波包和功率谱，因为它们被高斯和非高斯噪声部分掩盖了。采样寄存器由宽频传感器（100-800k Hz）采集，并由2.5MHz，8位ADC数字化。

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