Review of Sound Propagation in a Randomly Inhomogeneous Medium: Theory and Laboratory Experiments

1974 ◽  
Vol 55 (2) ◽  
pp. 441-441
Author(s):  
D. Mintzer
Keyword(s):  
Inhomogeneous Medium ◽  
Laboratory Experiments ◽  
Sound Propagation ◽  
Medium Theory

SOUND PROPAGATION THROUGH STRUCTURAL COMPONENTS UNDER CONDITIONS OF NON-RIGID CONTACT AT THE BOUNDARIES BETWEEN THEM

Akustika ◽  
2021 ◽  
Author(s):  
Konstantin Abbakumov ◽  
Anton Vagin ◽  
Alena Vjuginova
Keyword(s):  
Boundary Conditions ◽  
Inhomogeneous Medium ◽  
Dispersion Equation ◽  
Numerical Solutions ◽  
Sound Propagation ◽  
Structural Components ◽  
Frequency Range ◽  
Problem Statement ◽  
Ultrasonic Measurements ◽  
Rigid Contact

The report considers the problem statement, derivation and solution of the dispersion equation for sound propagation in a layered inhomogeneous medium with oriented fracturing, simulated by the presence of boundary conditions in the "linear slip" approximation. Numerical solutions are obtained and analyzed for the frequency range and values of the parameters of contact breaking, which is relevant in the problems of ultrasonic measurements

Sound Propagation Around Arrays of Cylinders

2013 ◽  
Author(s):  
Zhongquan C. Zheng ◽  
Guoyi Ke
Keyword(s):  
Immersed Boundary Method ◽  
Laboratory Experiments ◽  
Sound Propagation ◽  
Ground Effect ◽  
Immersed Boundary ◽  
Noise Barriers ◽  
Transmission Properties ◽  
Potential Applications ◽  
Sonic Crystals ◽  
Difference Time

Sound propagation through sonic crystals has been widely studied through predictions and laboratory experiments, because of its potential applications in many areas such as environmental noise barriers and sound cloaking. In this paper, a finite-difference time-domain (FDTD) numerical simulation coupled with the immersed boundary method is used to investigate the transmission properties of sonic crystals. The sonic crystals in this study are modeled as arrays of cylinders with their axes parallel to a ground boundary. Compared with semi-analytical solutions, the numerical scheme is validated with cases of simple arrays of rigid cylinders. The locations of cylinders, different porous materials for cylinders, and the ground effect are taken into account in our simulation. The results are presented with discussions on achieving optimized sonic crystals.

Covering of cometary nucleus by refractory crust and its evolution into asteroid-like body

1999 ◽  
Vol 173 ◽  
pp. 365-370
Author(s):  
Kh.I. Ibadinov
Keyword(s):  
Laboratory Experiments ◽  
Cometary Nucleus ◽  
Sublimation Rate ◽  
Cometary Nuclei ◽  
Short Period Comet ◽  
Short Period ◽  
Brightness Decrease ◽  
Crust Thickness ◽  
Ice Sublimation ◽  
Period Comet

AbstractFrom the established dependence of the brightness decrease of a short-period comet dependence on the perihelion distance of its orbit it follows that part of the surface of these cometary nuclei gradually covers by a refractory crust. The results of cometary nucleus simulation show that at constant insolation energy the crust thickness is proportional to the square root of the insolation time and the ice sublimation rate is inversely proportional to the crust thickness. From laboratory experiments resulted the thermal regime, the gas productivity of the nucleus, covering of the nucleus by the crust, and the tempo of evolution of a short-period comet into the asteroid-like body studied.

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