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An Adaptive Time Domain Approach to Characterize Dispersive Elastodynamic Media

[+] Author Affiliations
Reza Abedi

University of Tennessee Knoxville, Tullahoma, TN

Paper No. IMECE2017-70805, pp. V013T01A006; 7 pages
doi:10.1115/IMECE2017-70805
From:
  • ASME 2017 International Mechanical Engineering Congress and Exposition
  • Volume 13: Acoustics, Vibration and Phononics
  • Tampa, Florida, USA, November 3–9, 2017
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5848-6
  • Copyright © 2017 by ASME

abstract

A time domain approach is presented to compute the transmission and reflection coefficients of a unit cell. The solution of a wave scattering problem to an ultra-short incident wave enables the derivation of these scattering parameters with only one time domain solution. The adaptive operations of a spacetime discontinuous Galerkin method and several or its unique properties, such as linear solution complexity and local / asynchronous solution features, enable accurate computation of scattering parameters. An inverse parameter retrieval method, from the equivalent material impedance and wave speed to dispersive elastic constitutive parameters, is uniquely solved by using the continuity of the wavenumber.

Copyright © 2017 by ASME

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