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 (...
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 ...
The concepts that were introduced in Chapter 1: characteristic impedance and driving point impedance are readily reinterpreted for one-dimensional compressible fluid. The conservation of mass that determines how the change of density affects the fluid particle velocity is also clearly explored. Intensity ...
Kanevskii, I. N., Rozenberg, L. D.: Computation of the acoustic field in the focal region of a cylindrical focusing system. Soy. Phys. Acoust.3(1967) 46. MathSciNetGoogle Scholar Karal, F. C.: The analogous acoustical impedance for discontinuities and constrictions of circular cross sect...
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Based on the damped wave equation,the damped wave equation for seismic exploration is given for the study on evaluation problem of stratum acoustic impedance by the seismic data records.And applying Cauchy Problem instead of mixed problem in the process Of identifying acoustic impedance,we for give...
overturned reflections cannot be imaged by downward- continuation migration. Since the invention of wave-equation migration by Claerbout in the early 70’s, innumerable numerical methods for improving the angular range of downward-continuation migration have been introduced. Recently, the research focus ...
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...
The objective of the present study is to show that the method of volume integral used in conjunction with the zeroth-order edge-based basis functions (de Carvalho and de Souza Mendes 1999) gives an accurate and stable solution for a metal-dielectric resonator, when the number of the basis fu...
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...