전자기유도초음파를 이용한 복수기 전열관 결함신호 특성분석

• Published in: 설비공학 논문집, 27(3) Vol. 27; no. 3; pp. 174 - 178
• Main Authors: 최상훈(Sang-Hoon Choi), 왕지남(Gi-Nam Wang)
• Format: Journal Article
• Language: Korean
• Published: 대한설비공학회 2015
• Subjects: 기계공학; Frequency(주파수); Magnetostrictive Sensor(자왜형 센서); Condenser Tube(복수기 전열관); Guided Wave(유도 초음파)
• ISSN: 1229-6422; 2465-7611
• DOI: 10.6110/KJACR.2015.27.3.174

This paper describes a signal processing technique for identifying signals from defects by using an electromagnetic-ultrasonic guided waves method based on a magnetostrictive sensor that generates a torsional mode (T(0, 1)). Because this technique is based on the digital filtering, the filtered signals provide information on the relationship between the cutoff frequency of band-pass filter and the characteristic of defect signals in heat exchange tubes. To verify the performance of the technique, artificial defects with various thickness reduction ration and shape were machined in titanium tubes, and digital filtering results are reported. The results show that digital filtering provides information to the identify shape of defects and the contact condition between the tube and support ring. Therefore, the proposed technique has good potential as a tool for evaluating the integrity of heat exchange tubes.