Application of fuzzy pattern recognition in felting quality ultrasonic detection of composite material

Base on the signal of composite material felting quality in ultrasonic detection, the detection principle of ultrasonic pulse reflection echo method and the transmitting process of ultrasonic in two types of medium that is made by different material are analyzed in detail. Echo signal of detection ultrasonic carries the information of interface felting quality. The fuzzy pattern recognition method is used for felting quality recognition in this paper. By analyzing the characteristic of time and frequency domain of echo signal, attenuation coefficient, signal energy and amplitudes are calculated as characteristic values, and a fuzzy pattern recognition algorithm is designed to judge felting quality by the principle of choosing the nearest. Experimental results show that the algorithm is precise for recognition of felting quality.