Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Characteristic Analysis of Electromagnetic-ultrasonic Guided Waves for Defect Signals in Condenser Tubes

전자기유도초음파를 이용한 복수기 전열관 결함신호 특성분석

  • Choi, Sang-Hoon (Technical Research and Development Institute, KPS) ;
  • Wang, Gi-Nam (Department of Industrial Engineering, Ajou University)
  • 최상훈 (한전KPS주식회사 기술연구원) ;
  • 왕지남 (아주대학교 산업공학과)
  • Received : 2014.12.01
  • Accepted : 2015.01.26
  • Published : 2015.03.10
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Abstract

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.

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References

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  1. Recent Progress in Air-Conditioning and Refrigeration Research : A Review of Papers Published in the Korean Journal of Air-Conditioning and Refrigeration Engineering in 2015 vol.28, pp.6, 2016, https://doi.org/10.6110/KJACR.2016.28.6.256