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Acoustic Scattering

The method of fundamental solutions for the identification of a scatterer with impedance boundary condition in interior inverse acoustic scattering

The method of fundamental solutions for the identification of a scatterer with impedance boundary condition in interior inverse acoustic scattering

... Karageorghis, A, Lesnic, D orcid.org/0000-0003-3025-2770 and Marin, L (2018) The method of fundamental solutions for the identification of a scatterer with impedance boundary condition in interior inverse acoustic ...

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Solving the Dirichlet acoustic scattering problem for a surface with added bumps using the Green's function for the original surface

Solving the Dirichlet acoustic scattering problem for a surface with added bumps using the Green's function for the original surface

... We solve the Dirichlet problem for acoustic scattering from a surface which has been perturbed by the addition of one or more bumps. We build the solution for the bumpy case using the Green’s function for ...

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Simulating acoustic scattering from atmospheric temperature fluctuations using a k space method

Simulating acoustic scattering from atmospheric temperature fluctuations using a k space method

... The applicability of all these approaches, however, is built upon the validity of the Born approximation, which is essentially that forward scatter is negligible as a sound wave propagates through the atmosphere, meaning ...

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A transient boundary element method for acoustic scattering from mixed regular and thin rigid bodies

A transient boundary element method for acoustic scattering from mixed regular and thin rigid bodies

... sound scattering from a body is stated as a Boundary Integral Equation (BIE), the precursor to forming a BEM, the restriction that sound cannot travel through the body is lost and an air-filled cavity is ...

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Acoustic scattering of a complex-source beam by the edge of a plane angular sector

Acoustic scattering of a complex-source beam by the edge of a plane angular sector

... The scattering and diffraction of a complex-source beam (CSB) by an acoustically soft or hard plane angular sector is treated by a rigorous spherical-multipole analysis in sphero-conal ...

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A Neuro fuzzy Computing Technique for Modeling the Acoustic Form Function of Immersed Tubes

A Neuro fuzzy Computing Technique for Modeling the Acoustic Form Function of Immersed Tubes

... [22] Maze G., Léon F., Ripoche J., and Überall H. Repulsion phenomena in the phase-velocity dispersion curves of circumferential waves on elastic cylindrical shells, J. Acoust. Soc. Amer. 105, 1695-1701 (1999) and Maze ...

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Blinking Phase-Change Nanocapsules Enable Background-Free Ultrasound Imaging

Blinking Phase-Change Nanocapsules Enable Background-Free Ultrasound Imaging

... The irreversible vaporization of BLInCs (Fig. 4d) is possibly due to vaporization of larger BLInCs, coalescence of neighboring bubbles into larger stable bubbles, or diffusion of air into the cavity created by the ...

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Unique solvability and stability of the time domain electromagnetic scattering problem with a locally perturbed perfectly conducting plate

Unique solvability and stability of the time domain electromagnetic scattering problem with a locally perturbed perfectly conducting plate

... the acoustic case, via a Fourier–Laplace transformation of a time domain problem, a new problem that is sometimes referred to as the Laplace domain problem is ...domain scattering problems, can be proven ...

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... inverse acoustic scattering problem; the papers [18, 19, 20] showed that nodal sets of the Laplacian eigenfunctions play a critical role in establishing the uniqueness results for the inverse ...

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Acoustical Imaging in Heterogeneous Environments

Acoustical Imaging in Heterogeneous Environments

... and scattering medium, based on the methods of nonlinear phase speckle interferometry has been proposed and developed in [37-43], where it was shown that it is possible to uniquely recover the trajectory of a ...

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The MFS for the identification of a sound-soft interior acoustic scatterer

The MFS for the identification of a sound-soft interior acoustic scatterer

... Abstract. We employ the method of fundamental solutions (MFS) for detecting a sound-soft scatterer surrounding a host acoustic homogeneous medium due to a given point source inside it. The measurements are taken ...

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Acoustic diffusion and scattering coefficients for room surfaces

Acoustic diffusion and scattering coefficients for room surfaces

... Figure 8.14 on the following page shows values of the random incidence scatteringcoefficient,8, for the random battens sample, obtained using both the free field and reverberation chambe[r] ...

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Towards a full bandwidth numerical acoustic model

Towards a full bandwidth numerical acoustic model

... modern acoustic engineering and are used in a diverse range of applications from refining the acoustic design of classrooms and concert halls to predicting how noise exposure varies through an urban ...room ...

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Hamiltonian of Acoustic Phonons in Inhomogeneous Solids

Hamiltonian of Acoustic Phonons in Inhomogeneous Solids

... of acoustic phonons in inhomogeneous ...by acoustic frequencies and found the Hamiltonian of such system in the second ...the acoustic phonons quantum states can be discussed on basis of our ...

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A Perturbation Method for Inverse Scattering in Three Dimensions Based on the Exact Inverse Scattering Equations

A Perturbation Method for Inverse Scattering in Three Dimensions Based on the Exact Inverse Scattering Equations

... In part this situation arises since no exact inverse scattering equations have been developed for the acoustic, elastodynamic or electrodynamic wave equations in the general three dimens[r] ...

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Measurement and density normalisation of acoustic attenuation and backscattering constants of arbitrary suspensions within the Rayleigh scattering regime

Measurement and density normalisation of acoustic attenuation and backscattering constants of arbitrary suspensions within the Rayleigh scattering regime

... Expressions for f and have been established for spherical glass and quartz-type sand particles (see Appendix, Eq. A.6-A.9 respectively), via the heuristic fitting of data obtained by various authors normally within the ...

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Development of a General Methodology for Optimizing Acoustic Treatment Using an Equivalent Source Method

Development of a General Methodology for Optimizing Acoustic Treatment Using an Equivalent Source Method

... presented in Figures 3.18 through 3.23. As was observed for the 1m source location for the hard-wall cases, the analytical, (a), and FSC, (b), solutions are in excellent agreement. In Figures 3.18 through 3.20 the ...

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Analytical Computation of Acoustic Bidirectional Reflectance Distribution Functions

Analytical Computation of Acoustic Bidirectional Reflectance Distribution Functions

... standard acoustic ray tracing en- gine by introducing an extra step in the algorithm to compute the contribution of every ray collision with the en- vironment to the final Impulse ...comercial acoustic ray ...

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Studies into the detection of buried objects (particularly optical fibres) in saturated sediment  Part 3: experimental investigation of acoustic penetration of saturated sediment

Studies into the detection of buried objects (particularly optical fibres) in saturated sediment Part 3: experimental investigation of acoustic penetration of saturated sediment

... model scattering from rough elastic interfaces using first-order perturbation ...modelling acoustic propagation in poro-elastic layers, as described by the Biot theory ...the acoustic behaviour of a ...

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Article Description

Article Description

... The acoustic modes modulate the inter atomic ...resultant scattering of carriers is called deformation potential ...of scattering by acoustic phonons is from zero to 2vk  , where v is the ...

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