Journal of Power System Engineering (동력기계공학회지)

The Korean Society for Power System Engineering (한국동력기계공학회)
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Detection of Axial Defects in Pipes Using Chirplet Transform

첩릿변환을 이용한 배관 축방향 결함검출

  • Kim, Young-Wann (Department of Mechanical Design Engineering, Chonnam National University) ;
  • Park, Kyung-Jo (Department of Mechanical Design Engineering, Chonnam National University)
  • 김영완 (전남대학교 기계설계공학부) ;
  • 박경조 (전남대학교 기계설계공학부)
  • Received : 2016.04.07
  • Accepted : 2016.07.25
  • Published : 2016.08.31
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Abstract

The implementation of chirplet transform to locate axially aligned defects in pipes has been investigated. The results are obtained from experiments performed on a carbon steel pipe using magnetostrictive sensors. Chirplet transform is applied to the reflected signal to separate the individual modes from dispersive and multimodal waveform. The separated modes are used to calculate reflection coefficients which would be used to characterize defects. It is found that the reflection from a defect consists of the wave pulses with gradually decaying amplitudes. Also the results show that the reflection coefficient initially increases with the crack length but finally reaches an oscillating regime.

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References

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