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http://dx.doi.org/10.9726/kspse.2013.17.2.056

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

Park, Kyung-Jo (Department of Mechanical and Automotive Engineering, Chonnam University)
Kim, Chung-Yup (Department of Mechanical and Automotive Engineering, Chonnam University)
Publication Information
Journal of Power System Engineering / v.17, no.2, 2013 , pp. 56-62 More about this Journal
Abstract
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.
Keywords
Mode Attenuation; Torsional Wave; Shear Velocity; Defect;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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1 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.   DOI   ScienceOn
2 ASTM Standard D-4428/D-4428-94, 1994, "Standard Test Methods for Cross-hole Seismic Testing", American Society for Testing Materials, pp. 885-898.
3 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.   DOI   ScienceOn
4 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.   과학기술학회마을
5 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.   DOI   ScienceOn
6 J. W. Cheng and S. K. Yang, 2006, "Torsional Guided Wave Attenuation in Buried Pipe", Materials Evaluation, Vol. 64, pp. 412-416
7 J. L. Rose, 2000, "Ultrasonic Waves in Solid Media", Cambridge University Press, London, pp. 154-176.
8 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.   DOI   ScienceOn
9 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.
10 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.   과학기술학회마을