the acoustic impedance of the wave, equals, as for plane waves, the characteristic impedance of the medium Z0 = ρ0c0. At large distance a spherical wave behaves locally like a plane wave. For a spherical diverging harmonic wave of angular frequency ω with time dependence e‒ιwt (...
acoustic intensityacoustic potential energyacoustic impedancepropagation of sound wavesKirchhoff‐Helmholtz integralplane wavesIn this chapter, we explain three physical quantities in acoustics—interrelationships among acoustic pressure, particle velocity, and acoustic density. It is emphasized that these ...
Rayleigh's second perturbation is presented as ''Rayleigh's horn equation.'' The acoustic impedance at the throat of the horn and sound pressure interior to the horn as predicted from Rayleigh's theory are compared with laboratory measurements. 展开 ...
The acoustic wave equation states that the pressure satisfies the equation: (62)c2∇2p=∂2p∂t2 For illustrative purposes, consider the one-dimensional case in which the waves are traveling in the x direction. The equation satisfied in this case is (63)c2∂2p∂x2=∂2p∂t2 The ...
Time-Domain Modeling of the Acoustic Impedance of Porous Surfaces proportional to the particle velocity at the present time, whereas the other involves a convolution of the particle velocity with a slowly decaying response... DK Wilson,SL Collier,VE Ostashev,... - 《Acta Acustica United with Ac...
rayl- unit of acoustic impedance. Rayleigh equation- a ratio of red to green required by each observer to match spectral yellow. Synonym(s):Rayleigh test Rayleigh test- Synonym(s):Rayleigh equation Medical Eponyms © Farlex 2012 A colour equation representing a match of yellow (usually 589 nm...
Doubova, A., Fernández, C.E.: Some geometric inverse problems for the linear wave equation. Inv. Probl. Imag. 9(2) (2015) Eppler, K., Harbrecht, H.: A regularized newton method in electrical impedance tomography using shape hessian information. Control. Cybern. 34(1), 203–225 (2005...
Solution of an inverse scattering problem for the acoustic wave equation in three-dimensional media Athree-dimensionalinversescatteringproblemfortheacousticwaveequationisstudiedThetaskistodeterminethedensityandacousticimpedanceofamediumAnecessaryandsuffic... AV Baev - 《Computational Mathematics & Mathematical Phy...
In this paper, we consider the Dirichlet and impedance boundary value problems for the Helmholtz equation in a non-locally perturbed half-plane. These boundary value problems arise in a study of time-harmonic acoustic scattering of an incident field by a sound-soft, infinite rough surface where ...
The square of the acoustic impedance along an isentrope is expressed as a polynomial of a function X , which is the solution of the differential equation for isentropic pressure. In this case, the form of the Riemann integral has been obtained explicitly. The solution of the Riemann problem ...