This paper made some research on the method of feature extraction of ultrasonic flaw echo signals based on WPT, which can reserve the characteristics of high-frequency. After de-noising and feature extracting, characteristic vectors were measured and used to train SVM classifier. The SVM classification method could seek for the vectors which had preferable classifying ability. Through the real tests of aircraft bolts, the method had advantages such as high accuracy and high applicable value.
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