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Related Experiment Videos

Ultrasonic transient bounded-beam propagation in a solid cylinder waveguide embedded in a solid medium.

Laurent Laguerre1, Anne Grimault, Marc Deschamps

  • 1Section Reconnaissance et Géophysique, Laboratoire Central des Ponts et Chaussées, Centre de Nantes, Route de Bouaye, Bouguenais Cedex, France. laurent.laguerre@lcpc.fr

The Journal of the Acoustical Society of America
|May 3, 2007
PubMed
Summary
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This study presents a semianalytical solution for ultrasonic guided wave propagation in embedded solid cylinders. The method aids in minimizing signal attenuation for improved long-range inspection of embedded structures.

Area of Science:

  • Acoustics and Ultrasonics
  • Solid Mechanics
  • Materials Science

Background:

  • Ultrasonic guided waves are crucial for inspecting embedded structures.
  • Predicting wave propagation in embedded cylinders is complex due to material interactions.
  • Existing modal techniques may have limitations in certain scenarios.

Purpose of the Study:

  • To develop a semianalytical solution for ultrasonic pulsed-bounded-beam propagation in solid cylinders embedded in a solid matrix.
  • To interpret the influence of the embedding material and waveguide sidewall interactions on wave propagation.
  • To establish a methodology for minimizing radiation attenuation for enhanced long-range inspection.

Main Methods:

  • Utilizing Debye series expansion of generalized cylindrical reflection/transmission coefficients.

Related Experiment Videos

  • Deriving the spectral response to an axisymmetric velocity source.
  • Synthesizing the transient guided wave response via inverse double Fourier-Bessel transform.
  • Analyzing simulated (f, 1/lambdaz) diagrams and time waveforms.

    • Main Results:

    • The solution decomposes the guided wave response into infinite medium contribution and various sidewall interactions.
    • Embedding material was shown to filter signal portions, concentrating energy where phase velocity matches steel.
    • Simulated waveforms revealed periodical patterns governed by longitudinal/transversal wave conversions.
    • Radiation attenuation in the surrounding cement grout was analyzed.

    Conclusions:

    • The semianalytical solution provides an alternative and complementary approach to modal techniques.
    • Understanding wave conversions and filtering effects is key to interpreting guided wave signals in embedded cylinders.
    • A methodology to minimize radiation attenuation was deduced, enabling more effective long-range inspection.