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Article Dans Une Revue Journal of Applied Physics Année : 2016

Spatial Laplace transform for complex wavenumber recovery and its application to the analysis of attenuation in acoustic systems

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C. Prada

Résumé

We present a method for the recovery of complex wavenumber information via spatial Laplace transforms of spatiotemporal wave propagation measurements. The method aids in the analysis of acoustic attenuation phenomena and is applied in three different scenarios: (i) Lamb-like modes in air-saturated porous materials in the low kHz regime, where the method enables the recovery of viscoelastic parameters; (ii) Lamb modes in a Duralumin plate in the MHz regime, where the method demonstrates the effect of leakage on the splitting of the forward S-1 and backward S-2 modes around the Zero-Group Velocity point; and (iii) surface acoustic waves in a two-dimensional microscale granular crystal adhered to a substrate near 100 MHz, where the method reveals the complex wave-numbers for an out-of-plane translational and two in-plane translational-rotational resonances. This method provides physical insight into each system and serves as a unique tool for analyzing spatiotemporal measurements of propagating waves.
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Dates et versions

hal-01445395 , version 1 (20-02-2018)

Licence

Paternité - CC BY 4.0

Identifiants

Citer

A. Geslain, Samuel Raetz, M. Hiraiwa, M. Abi Ghanem, P. Wallen, et al.. Spatial Laplace transform for complex wavenumber recovery and its application to the analysis of attenuation in acoustic systems. Journal of Applied Physics, 2016, 120 (13), ⟨10.1063/1.4963827⟩. ⟨hal-01445395⟩
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