Method for extracting features of crack acoustic emission signal of drawing part
An acoustic emission signal and feature extraction technology, which is applied in the direction of using acoustic emission technology for material analysis, processing detection response signals, etc. Network identification speed and accuracy, etc., to achieve the effect of fast calculation speed, improve diagnosis efficiency, and shorten diagnosis time
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[0012] Such as figure 1 As shown, in the present invention, the original signal of the crack acoustic emission of the deep-drawing part is preprocessed in the computer, and then the local energy feature of the local wave is extracted, and finally the characteristic parameters of the genetic algorithm are automatically recombined to obtain an effective identification drawing. The optimal characteristic parameters of the acoustic emission signal of the crack in the deep part are specified as follows:
[0013] In the computer, the original acoustic emission signal of cracks in the deep-drawing parts is firstly processed through signal preprocessing, and the signal preprocessing includes pre-amplification, filtering, A / D conversion and other pre-processing in turn. Aiming at the acoustic emission characteristics of cracks in deep-drawing parts, a resonant sensor with a bandwidth of 100KHz-300KHz is selected to capture the corresponding acoustic emission signals when cracks occur. ...
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