Journal of the Korean Society for Nondestructive Testing (비파괴검사학회지)

The Korean Society for Nondestructive Testing (한국비파괴검사학회)
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Analysis of the Propagation Characteristics of Ultrasonic Guided Waves Excited by Single Frequency and Broadband Sources

  • Kang, To (School of Mechanical Engineering, Sungkyunkwan University) ;
  • Song, Sung-Jin (School of Mechanical Engineering, Sungkyunkwan University) ;
  • Kim, Hak-Joon (School of Mechanical Engineering, Sungkyunkwan University) ;
  • Cho, Young-Do (System Research Team, Institute of Gas Safety R&D, Korea Gas Safety Corporation) ;
  • Lee, Dong-Hoon (System Research Team, Institute of Gas Safety R&D, Korea Gas Safety Corporation) ;
  • Cho, Hyun-Joon (Advanced Institute of Quality and Safety)
  • Published : 2009.12.30
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Abstract

Excitation and propagation of guided waves are very complex problems in pipes due to their dispersive nature. Pipes are commonly used in the oil, chemical or nuclear industry and hence must be inspected regularly to ensure continued safe operation. The normal mode expansion(NME) method is given for the amplitude with which any propagating waveguide mode is generated in the pipes by applied surface tractions. Numerical results are calculated based on the NME method using different sources, i.e., non-axisymmetric partial loading and quasi-axisymmetric loading sources. The sum of amplitude coefficients for 0~nineth order of the harmonic modes are calculated based on the NME method and the dispersion curves in pipes. The superimposed total field which is namely the angular profile, varies with propagating distance and circumferential angle. This angular profile of guided waves provides information for setting the transducer position to find defects in pipes.

Keywords

References

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