| Title |
Temperature Classification of Heat-treated Metals using Pattern Recognition of Ultrasonic Signal |
| Authors |
임내묵(Im, Rae-Muk) ; 신동환(Sin, Dong-Hwan) ; 김덕영(Kim, Deok-Yeong) ; 김성환(Kim, Seong-Hwan) |
| Keywords |
Ultrasonic grain signal ; Heat-treated temperature ; Pattern recognition ; Artificial Intelligence ; ACV |
| Abstract |
Recently, ultrasonic testing techniques have been widely used in the evaluation of the quality of metal. In this experiment, six heat-treated temperature of specimen have been considered : 0, 1200, 1250, 1300, 1350 and 1387°C. As heat-treated temperature increases, the grain size of stainless steel also increases and then, eventually make it destroy. In this paper, a pattern recognition method is proposed to identify the heat-treated temperature of metals by evidence accumulation based on artificial intelligence with multiple feature parameters; difference absolute mean value(DAMV), variance(VAR), mean frequency(MEANF), auto regressive model coefficient(ARC), linear cepstrum coefficient(LCC) and adaptive cepstrum vector(ACV). The grain signal pattern recognition is carried out through the evidence accumulation procedure using the distances measured with reference parameters. Especially ACV is superior to the other parameters. The results (96% successful pattern classification) are presented to support the feasibility of the suggested approach for ultrasonic grain signal pattern recognition. |