Asymptotic modelling of the Rayleigh-Bloch waves travelling along a periodically-perturbed elastic surface, by Aleksey Pichugin (Brunel University London) Jan. 25, 2017
DENORMS Action’s Workshop “Modelling of high performance acoustic structures Porous media, metamaterials and sonic crystals”, Rome, 24-25th January 2017
Session on New trends in vibroacoustics (i.e. elastic metamaterials and metasurfaces)
Speaker: Aleksey Pichugin (Brunel University London)
Abstract:
It is well-known that a free surface of an elastic half-space can support inhomogeneous waves that propagate along the surface and exponentially decay away from it. These Rayleigh waves propagate without dispersion and can be shown to exist in a wide range of practically-relevant settings (including material anisotropy and surface curvature). In this paper we will investigate how a series of small-scale periodic perturbations to the surface can modify the behaviour of the Rayleigh waves, by introducing dispersion and forming phononic band gaps. A simple model problem will be used to illustrate the relevant physical phenomena and the technique of high-frequency asymptotic homogenization will be used to construct a simple analytical model for the resulting Rayleigh-Bloch waves.
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Pauline Rasera
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- Duration : 00:20:19
- Number of view(s) : 34
- Type : Conférence 705
- Discipline : Acoustique 147 Mécanique 162 Méthodes de l’ingénieur 62 Physique 67
- Updated on Feb. 22, 2017
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Contributor(s): writers, directors, editors, designers… :
- Groby Jean-Philippe (director)
- Canutoman (editor)
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