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M Bayray, F. Rauscher:
"WAVELET TRANSFORM ANALYSIS OF EXPERIMENTAL AE WAVEFORMS ON STEEL PRESSURE VESSEL";
Journal of Acoustic Emission, 24 (2006), S. 22 - 43.

Recent literature on wavelet transform (WT) discusses the use of the method in identification of wave modes in an acoustic emission (AE) signal. Theoretical models and results of experiments on test specimen are discussed. These models and experimental results are mostly for thin plates. This paper considers an experimental work carried out on a steel pressure vessel with a thickness of 15 mm. One of the aims of the experiment was to study the WT method on AE signals in identifying wave modes in the signals. The paper discusses the theoretical dispersion of waves for the thickness of 15 mm and steel material as a background. Mathematically calculated signals based on the dispersion curves are first analyzed using the WT method. AE signals, acquired using pencil lead break as source, are then analyzed. Finally, AE signals acquired during pressure tests are analyzed. The paper presents the details of the experimental set up, test procedures, and detailed WT analysis of selected AE signals. In most of the AE signals acquired during the pressure tests the WT method failed to identify the wave modes. The paper describes the problems associated with mode identification employing resonant sensors.

Recent literature on wavelet transform (WT) discusses the use of the method in identification of wave modes in an acoustic emission (AE) signal. Theoretical models and results of experiments on test specimen are discussed. These models and experimental results are mostly for thin plates. This paper considers an experimental work carried out on a steel pressure vessel with a thickness of 15 mm. One of the aims of the experiment was to study the WT method on AE signals in identifying wave modes in the signals. The paper discusses the theoretical dispersion of waves for the thickness of 15 mm and steel material as a background. Mathematically calculated signals based on the dispersion curves are first analyzed using the WT method. AE signals, acquired using pencil lead break as source, are then analyzed. Finally, AE signals acquired during pressure tests are analyzed. The paper presents the details of the experimental set up, test procedures, and detailed WT analysis of selected AE signals. In most of the AE signals acquired during the pressure tests the WT method failed to identify the wave modes. The paper describes the problems associated with mode identification employing resonant sensors.

acoustic emission, pressure vessel, wavelet transform