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Absorption and impedance boundary conditions for phased geometrical-acoustics methods [PDF]
Journal of the Acoustical Society of America, 2012 Defining accurate acoustical boundary conditions is of crucial importance for room acoustic simulations. In predicting sound fields using phased geometrical acoustics methods, both absorption coefficients and surface impedances of the boundary surfaces ...
Cheol-Ho Jeong +2 more
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Web-based geometric acoustic simulator
Proceedings of the 23rd International ACM Conference on 3D Web Technology, 2018Geometric acoustics is one of the most commonly used techniques for exploring what a virtual environment sounds like. These methods allow the user to place a sound source and receiver in a space and compute how the space influences what the receiver hears. These simulation methods are well-known, but most are proprietary or difficult to implement.
Taylor, Micah, Meng, F.
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2021
Sound propagation in air is accurately described by a small perturbation of the ambient pressure away from a quiescent state. This is the realm of linear acoustics, where the propagation of a time-harmonic wave can be modeled using the Helmholtz equation.
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Sound propagation in air is accurately described by a small perturbation of the ambient pressure away from a quiescent state. This is the realm of linear acoustics, where the propagation of a time-harmonic wave can be modeled using the Helmholtz equation.
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Underwater acoustic imaging: image due to a specular reflector in the geometrical-acoustics limit [PDF]
Journal of Marine Science and Technology, 2006 In underwater acoustic imaging, used to produce high-quality images in turbid waters, a specular reflector can produce a 'pseudoimage' of the receiving array at the reflecting surface.
Blair, David G
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Acoustic Propagation in Dispersions and the Geometric Theory of Diffraction
SIAM Journal on Applied Mathematics, 2003Summary: The ultrasonic characterization of emulsions relies principally upon the theory of thermoacoustic scattering. For a single spherical particle of radius a suspended in a homogeneous medium, the theory provides an exactly soluble solution to the scattering problem.
Brian D. Sleeman +3 more
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1984
Publisher Summary This chapter discusses geometrical crystal acoustics. Acceleration waves in an inhomogeneous and anisotropic two-dimensional elastic solid are studied using compatibility relations generalized from those of T. Y. Thomas. Ray directions and an integral expression for decay are obtained in the case of differentiable inhomogeneity of ...
R.S.D. Thomas, H. Cohen
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Publisher Summary This chapter discusses geometrical crystal acoustics. Acceleration waves in an inhomogeneous and anisotropic two-dimensional elastic solid are studied using compatibility relations generalized from those of T. Y. Thomas. Ray directions and an integral expression for decay are obtained in the case of differentiable inhomogeneity of ...
R.S.D. Thomas, H. Cohen
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Acoustic Geometric and Acoustic Cyclotron Resonances in Gallium
Physical Review B, 1972Acoustic geometric and acoustic cyclotron resonances in high-purity single crystals of gallium were investigated at 1.3 \ifmmode^\circ\else\textdegree\fi{}K and in the normal geometry where the magnetic field is perpendicular to the wave vector of the ultrasonic waves.
C. Alquié, J. Lewiner
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Underwater acoustic sensing using the geometric phase
The Journal of the Acoustical Society of America, 2023We present a sensing modality using the geometric phase of acoustic waves propagating in an underwater environment. We experimentally investigate the effect of scattering by a small subwavelength perturbation on a flat submerged surface. We represent the state of an acoustic field in the unperturbed and perturbed cases as multidimensional vectors.
Trevor D. Lata +4 more
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Coherence propagation and geometric acoustics
The Journal of the Acoustical Society of America, 1986In this work, the method of propagating the mutual coherence function through a deterministic environment using geometric acoustic Green’s functions is shown. It is also demonstrated how WKB Green’s functions for the acoustic field result in the locally quadratic approximation for the coherence function. Next, it is shown that an exact channel function
David H. Berman, John J. McCoy
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Nonlinear Geometrical Acoustics
1975Abstract : The development of the theory of nonlinear wave propagation in both bounded and semi-infinite dissipative media is followed from its origins in the theories of linear geometrical acoustics, simple waves, and acceleration fronts. In Part I, Sections 2 to 5, we consider examples in which only one component wave is excited and describe the ...
Brian R. Seymour, Michael P. Mortell
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