Comment on “Anomalous wave propagation in a one-dimensional acoustic metamaterial having simultaneously negative mass density and Young's modulus” [J. Acoust. Soc. Am. 132, 2887–2895 (2012)]
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Media type:
E-Article
Title:
Comment on “Anomalous wave propagation in a one-dimensional acoustic metamaterial having simultaneously negative mass density and Young's modulus” [J. Acoust. Soc. Am. 132, 2887–2895 (2012)]
Contributor:
Marston, Philip L.
Published:
Acoustical Society of America (ASA), 2014
Published in:
The Journal of the Acoustical Society of America, 135 (2014) 3, Seite 1031-1033
Description:
<jats:p>The phase and group velocities of elastic guided waves are important in the physical interpretation of high frequency scattering by fluid-loaded elastic shells. Outside the context of scattering, those properties are also important for understanding the energy flow in acoustic metamaterials. In a recent investigation of acoustic metamaterials exhibiting anomalous wave propagation [J. Acoust. Soc. Am. 132, 2887–2895 (2012)] criticism of negative group velocity terminology was generalized to elastic waves guided on ordinary materials. Some context and justification for retaining the identification of negative group velocities associated with a type of backscattering enhancement for shells are explained here. The phase evolution direction is determined by the boundary conditions.</jats:p>