The acoustic emission (AE) signals of metal materials have been widely used to identify the\ndeformation stage of a pressure vessel. In this work, Q235 steel samples with different propagation\ndistances and geometrical structures are stretched to get the corresponding acoustic emission signals.\nThen the obtained acoustic emission signals are de-noised by empirical mode decomposition (EMD),\nand then decomposed into two different frequency ranges, i.e., one mainly corresponding to metal\ndeformation and the other mainly corresponding to friction signals. The ratio of signal energy between\ntwo frequency ranges is defined as a new acoustic emission characteristic parameter. Differences\ncan be observed at different deformation stages in both magnitude and data distribution range.\nCompared with other acoustic emission parameters, the proposed parameter is valid in different\nsetups of the propagation medium and the coupled stiffness.
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