Generation of acoustic waves by an impulsive point source in a fluid/porous‐medium configuration with a plane boundary

1988 ◽  
Vol 84 (S1) ◽  
pp. S152-S152
Author(s):  
Sÿtze M. de Vries ◽  
Adrianus T. de Hoop
Keyword(s):  
Porous Medium ◽  
Point Source ◽  
Acoustic Waves ◽  
Plane Boundary

Poroacoustic acceleration waves

2006 ◽  
Vol 462 (2075) ◽  
pp. 3493-3499 ◽  
Author(s):  
M Ciarletta ◽  
B Straughan
Keyword(s):  
Porous Medium ◽  
Acoustic Waves ◽  
Building Industry ◽  
Acceleration Wave ◽  
Acceleration Waves ◽  
Continuum Thermodynamic ◽  
Thermodynamic Derivation

A model for acoustic waves in a porous medium is investigated. Due to the use of lighter materials in modern buildings and noise concerns in the environment, such models for poroacoustic waves are of much interest to the building industry. The model has been investigated in some detail by P. M. Jordan. Here we present a rational continuum thermodynamic derivation of the Jordan model. We then present results for the amplitude of an acceleration wave making no approximations whatsoever.

Acoustic waves generated by a point source in a sloping fluid layer

1989 ◽  
Vol 85 (4) ◽  
pp. 1414-1426 ◽  
Author(s):  
Yih‐Hsing Pao ◽  
Franz Ziegler ◽  
Yi‐Sun Wang
Keyword(s):  
Point Source ◽  
Acoustic Waves ◽  
Fluid Layer

Seismic waves generated by an impulsive point source in a solid/fluid configuration with a plane boundary

Geophysics ◽  
1985 ◽  
Vol 50 (7) ◽  
pp. 1083-1090 ◽  
Author(s):  
Adrianus T. de Hoop ◽  
Jos H. M. T. van der Hijden
Keyword(s):  
Point Source ◽  
Seismic Waves ◽  
Integral Transform ◽  
Vertical Plane ◽  
Computation Time ◽  
Plane Boundary ◽  
Head Wave ◽  
Transform Method ◽  
Expansion Model ◽  
Fluid Configuration

The space‐time acoustic wave motion generated by an impulsive point source in a solid/fluid configuration with a vertical plane boundary is calculated with the aid of the modified Cagniard method. Two types of sources are considered in detail, viz. (1) a point source of expansion (model for an explosive source), and (2) a point force parallel to the vertical interface (model for a mechanical vibrator). Numerical results are presented for the transmitted scalar traction in the fluid in those regions of space where head wave contributions occur. There is a marked difference in the time response observed for the two types of sources and for the different positions of the receiver in the fluid with respect to the position of the source in the solid. These waveform differences are important when the transmitted wave in the fluid is used to determine experimentally the elastic properties of the solid. Scholte waves are observed only when the source is close to the fluid/solid interface. As compared with the traditional Fourier‐Bessel integral transform method of handling this problem, the computation time with the method presented here is considerably less.

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