Fuzzy pattern recognition method of flaw in tube by ultrasonic testing

In this paper the fuzzy pattern recognition of flaw in tube is discussed.The physical model for recognizing flaw by fuzzy pattern recognition is described.The rule and the method for selecting characteristic indexes of the fuzzy model are developed.Three standard fuzzy subsets of the defects are constructed.An algorithm of fuzzy pattern recognition is used to process a large number of experimental data of known and unknown flaws detected.The result shows that it is expectant.