동력기계공학회지 (Journal of Power System Engineering)

  • 제17권2호
  • /
  • Pages.56-62
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  • 2013
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  • 2713-8429(pISSN)
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  • 2713-8437(eISSN)
한국동력기계공학회 (The Korean Society for Power System Engineering)
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비틀림 유도파를 이용한 토양 특성 규명 및 지하매설 배관 결함 검출

Identification of the Properties of Soils and Defect Detection of Buried Pipes Using Torsional Guided Waves

  • 박경조 (전남대학교 기계자동차공학부) ;
  • 김정엽 (전남대학교 기계자동차공학부)
  • Park, Kyung-Jo (Department of Mechanical and Automotive Engineering, Chonnam University) ;
  • Kim, Chung-Yup (Department of Mechanical and Automotive Engineering, Chonnam University)
  • 투고 : 2012.11.27
  • 심사 : 2013.02.20
  • 발행 : 2013.04.30
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초록

A technique is presented that uses a circular waveguide for the measurement of the bulk shear (S-wave) velocities of unconsolidated, saturated media, with particular application to near surface soils. The technique requires the measurement of the attenuation characteristics of the fundamental torsional mode that propagate along an embedded pipe, from which the acoustic properties of the surrounding medium are inferred. From the dispersion curve analysis, the feasibility of using fundamental torsional mode which is non-dispersive and have constant attenuation over all frequency range is discussed. The principles behind the technique are discussed and the results of an experimental laboratory validation are presented. The experimental data are best fitted for the different depths of wetted sand and the shear velocities are evaluated as a function of depths. Also the characteristics of the reflected signal from the defects are examined and the reflection coefficients are calculated for identifying the relation between defect sizes and the magnitude of the reflected signal.

키워드

참고문헌

  1. R. Long, K. Vine and M. Lowe, 2001, "Monitoring Acoustic Wave Propagation in Buried Cast Iron Water Pipes", Review of Progress in Quantitative NDE, Vol. 20B, pp. 1202-1209.
  2. K. J. Park, W. S. Kang and Y. G. Kim, 2009, "Attenuation Characteristics of the Buried Steel Water Pipes", Journal of Korea Society for Power System Engineering, Vol. 13, No. 1, pp. 39-45.
  3. H. Kwun, S. Y. Kim, M. S. Choi and S. Walker, 2004, "Torsional Guided Wave Attenuation in Coal-Tar-Enamel-Coated Buried Piping", NDT&E International, Vol. 37, pp. 663-665. https://doi.org/10.1016/j.ndteint.2004.05.003
  4. J. Hua, J. Mu and J. Rose, 2011, "Guided Wave Propagation in Single and Double Layer Hollow Cylinders Embedded in Infinite Media", Journal of Acoustical Society of America, Vol. 129, pp. 691-700. https://doi.org/10.1121/1.3531807
  5. ASTM Standard D-4428/D-4428-94, 1994, "Standard Test Methods for Cross-hole Seismic Testing", American Society for Testing Materials, pp. 885-898.
  6. R. Long, M. Lowe and P. Cawley, 2003, "Attenuation Characteristics of the Fundamental Modes that Propagate in Buried Iron Water Pipes", Ultrasonics, Vol. 41, pp. 509-519. https://doi.org/10.1016/S0041-624X(03)00166-5
  7. K. J. Park, W. S. Kang and D. J. Kang, 2010, "Flaw Detection of Petrochemical Pipes Using Torsional Waves", Journal of Korea Society for Power System Engineering, Vol. 14, No. 3, pp. 46-51.
  8. R. Caradente, J. Ma and P. Cawley, 2010, "The Scattering of the Fundamental Torsional Mode from Axi-symmetric defects with Varying Depth Profile in Pipes", Journal of Acoustic Society of America, Vol. 127, pp. 3440-3448. https://doi.org/10.1121/1.3373406
  9. J. W. Cheng and S. K. Yang, 2006, "Torsional Guided Wave Attenuation in Buried Pipe", Materials Evaluation, Vol. 64, pp. 412-416
  10. J. L. Rose, 2000, "Ultrasonic Waves in Solid Media", Cambridge University Press, London, pp. 154-176.

피인용 문헌

  1. Characterization of Chemical Sludge inside Pipes Using Torsional Guided Waves vol.18, pp.3, 2014, https://doi.org/10.9726/kspse.2014.18.3.029