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Acoustic emission (AE) is a new approach to rub-impact recognition. The fuzzy entropy is introduced to analyze the effectiveness of the features, and the method of fuzzy comprehensive evaluation combining effectiveness analysis is proposed to acoustic emission recognition. Duration, average amplitude, maximum amplitude, dynamic range of amplitude and the first four nodes energies of the reconstructing...
It is very important, by analyzing and processing ultrasonic echo signals of seabed oil pipeline, to acquire the effective information. Because of the complicated detection system structure and ultrasound coupler impurity, there are inevitably different noises in echo signals. In order to improve the accuracy of detection, it is very necessary to process ultrasonic echo signals by de-noising. According...
In the process of ultrasonic testing, the quality of flaw echo signals in A-scan lay a better determinant foundation for location, quantitative and qualitative valuation. Flaw echo signal exited the characteristics of electrical noise, scattering noise in ultrasonic testing, which was sometimes very difficult to eliminate. Considering the distinctness of distribution between defects signals and noises,...
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