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National Repository of Grey Literature 3 records found  Search took 0.01 seconds. 
Finite element modelling of elastic wave propagation in heterogeneous media
 Kolman, Radek ; Cho, S.S. ; González, J. A. ; Park, K.C.
In this contribution, we present an explicit scheme based on local time stepping respecting local wave speed and local stability limit for each finite element. The work aim is to suppress the spurious oscillations in wave propagation tasks in heterogeneous bars.
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Numerical modeling of surface elastic wave scattering in polycrystalline materials
 Grabec, Tomáš ; Ryzy, M. ; Verres, I. A.
Grain-boundary scattering of acoustic waves in polycrystalline materials is studied with analytical and numerical methods in the presented paper. In particular, the attenuation of Surface Acoustic Waves (SAWs) propagating through a polycrystalline microstructure is investigated. A three dimensional timedomain finite-element method (FEM) is utilized for the numerical simulation, whereby the granular microstructure is modeled by Voronoi tessellation. The resulting frequency-dependent attenuation coefficients are compared to an explicit analytical model.
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Šíření elastických vln ve složitých leteckých konstrukcích
 Blaháček, Michal ; Převorovský, Zdeněk ; Chlada, Milan
Elastic wave propagation in aircraft structure is very complicated. To better understand the wave propagation, fragment of L-39 plane wing was tested. Recorded AE signals were analysed and some important regularities in the signal parameters were disclosed.
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