Journal ArticleDOI
Generation of acoustic waves by an impulsive point source in a fluid/porous‐medium configuration with a plane boundary
TLDR
In this article, the space-time acoustic wave motion generated by a two-dimensional, impulsive, monopole line source in a fluid/solid configuration with a plane boundary is calculated with the aid of the modified Cagniard technique.Abstract:
The space–time acoustic wave motion generated by a two‐dimensional, impulsive, monopole line source in a fluid/solid configuration with a plane boundary is calculated with the aid of the modified Cagniard technique. The source is located in the fluid, and numerical results are presented for the reflected‐wave acoustic pressure, especially in those regions of space where head wave contributions occur. There is a marked difference in time response in the different regimes that exist for the wave speed in the fluid in relation to the different wave speeds (compressional, shear, Rayleigh) in the solid. These differences are of importance to the situation where the reflected wave in the fluid is used to determine experimentally the elastic properties of the solid.read more
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Journal ArticleDOI
Leaky Rayleigh and Scholte waves at the fluid-solid interface subjected to transient point loading
TL;DR: In this article, the analysis of acoustic waves generated by a transient normal point load applied on a fluid-solid interface is presented, and the closed-form exact solution of the wave motion is obtained by using integral transform techniques.
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Finite-difference modeling of wave propagation in a fluid-solid configuration
TL;DR: In this paper, it was shown that for an interface not aligned with the grid (irregular interfaces), a spatial sampling of at least 15 gridpoints per minimum wavelength is required to obtain acceptable results, particularly in seismic seabed applications where Scholte waves may need to be modeled more accurately.
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Reflection and transmission of waves at a fluid/porous‐medium interface
TL;DR: In this paper, the wave properties at a fluid/porous medium interface were studied by using newly derived closed-form expressions for the reflection and transmission coefficients, where the porous medium consists of a water-saturated clay/silt layer, a water saturated sand layer, an air-filled sand layer or an air filled sand layer.
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A highly accurate discontinuous Galerkin method for complex interfaces between solids and moving fluids
Martin Käser,Michael Dumbser +1 more
TL;DR: In this paper, a new highly accurate numerical scheme for unstructured 2D and 3D meshes based on the discontinuous Galerkin approach to simulate seismic wave propagation in heterogeneous media containing fluid-solid interfaces is presented.
Non-Contact NDT of Concrete Structures Using Air -Coupled Sensors
TL;DR: In this article, an air-coupled sensing technique is proposed as a solution to improve the efficiency of elastic wave-based test methods for concrete structures, and the experimental results show leaky Rayleigh waves are sensitive to the existence of cracks when waves propagate across cracks; the crack positions are clearly located in a 2-D scanning test image.