Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
권호 표지

Prediction and Analysis of Bobbin ECT Signals generated by Tube Defects near Support Plate

지지대 부근의 전열관 결함으로 인해 발생되는 보빈 와전류신호의 예측 및 분석

  • Shin, Young-Kil (School of Electronic and Information Engineering, Kunsan National University) ;
  • Lee, Yun-Tai (School of Electronic and Information Engineering, Kunsan National University)
  • 신영길 (군산대학교 전자정보공학부) ;
  • 이윤태 (군산대학교 전자정보공학부)
  • Published : 2005.07.18
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Abstract

In this study, eddy current signals from various anomalous defects in the heat exchanger tube are predicted af their signal slope characteristics no analyzed. The signal changes due to frequency increase are also observed. Based in the accumulated knowledge, the analysis of superimposed signal is attempted which includes the effects of support plate. Both differential and absolute bobbin probe signals are analyzed. For the prediction of signals, axisymmetric finite element modeling is used and this leads us to the utilization of slope angle analysis of the signal. Results show that differential signals are useful to locate the position of defect under the support plate and absolute signals no easy to predict and analyze even though they no superimposed signals. Combined use of these two types of signals will accomplish a reliable inspection.

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