Design of Acoustic Cloak by Transmission Line Approach

2008 ◽  
Author(s):  
Shu Zhang ◽  
Nicholas Fang
Keyword(s):  
Wave Propagation ◽  
Transmission Line ◽  
Acoustic Waves ◽  
Effective Density ◽  
Transmission Line Model ◽  
Acoustic Wave Propagation ◽  
Exterior Field ◽  
Acoustic Parameters ◽  
Helmholtz Resonators ◽  
Great Potential Application

This paper proposed an approach to construct the acoustic cloak by a network of subwavelength Helmholtz resonators. Based on transmission line model to describe the acoustic wave propagation inside such effective anisotropic medium, we derived the acoustic parameters such as effective density and compressibility. Our simulation demonstrates the propagation of acoustic waves can be bent and excluded from an object inside the cloak with no perturbation of exterior field, which may have great potential application in ultrasound noise control.

scholarly journals The acoustic waves propagation in a cylindrical waveguide with the laminar flow

2018 ◽  
Vol 211 ◽  
pp. 04005
Author(s):  
Alexander Petrov ◽  
Valentina Rumyantseva
Keyword(s):  
Wave Propagation ◽  
Laminar Flow ◽  
Acoustic Waves ◽  
Approximate Analytical Solution ◽  
Acoustic Oscillations ◽  
Acoustic Wave Propagation ◽  
Inhomogeneous Flow ◽  
Waves Propagation ◽  
The Individual ◽  
Hydrodynamics Equations

The problem of modeling of acoustic wave propagation in inhomogeneous flow is considered. There is an approximate analytical solution of the hydrodynamics equations in the presence of annular acoustic oscillations source in the case of laminar flow. Special attention is to paid to the propagation of acoustic waves modes. The amplitudes and phases dependences of the individual modes on the Mach number in the linear approximation were established.

Experiments on Damping of Acoustic Waves in Water-Filled Pipes

2006 ◽  
Author(s):  
Vijay Chatoorgoon ◽  
Qizhao Li
Keyword(s):  
Experimental Study ◽  
Wave Propagation ◽  
Acoustic Wave ◽  
Turbulent Flow ◽  
Acoustic Waves ◽  
Model Comparison ◽  
System Response ◽  
Acoustic Wave Propagation ◽  
The Third ◽  
Zero Flow

A simple, fundamental experimental study was conducted to better understand acoustic wave propagation is fluid-filled pipes. Three experiments were undertaken: the first with zero flow and a closed outlet end, the second with turbulent flow and an open outlet end and the third with zero flow and an open outlet end. The intent was to obtain data for model comparison and to determine the effect of turbulent flow on the system response. New insights are obtained and reported.

EXPERIENCE ON ACOUSTIC WAVE PROPAGATION IN ROCK SALT IN THE FREQUENCY RANGE 1-100 kHz AND CONCLUSIONS WITH RESPECT TO THE FEASIBILITY OF A ROCK SALT DOME AS NEUTRINO DETECTOR

2006 ◽  
Vol 21 (supp01) ◽  
pp. 30-34 ◽  
Author(s):  
GERD MANTHEI ◽  
JÜRGEN EISENBLÄTTER ◽  
THOMAS SPIES
Keyword(s):  
Wave Propagation ◽  
Acoustic Wave ◽  
Rock Salt ◽  
Acoustic Waves ◽  
Wave Attenuation ◽  
High Energy ◽  
Neutrino Detector ◽  
Frequency Range ◽  
Acoustic Wave Propagation

Rock salt is a promising material for the detection of acoustic waves generated by interactions of high energy neutrinos. The economical feasibility of an acoustic neutrino detector strongly depends on the spacing between the acoustic sensors. In this paper we report on our experience on acoustic wave propagation and wave attenuation in rock salt in the frequency range of 1 to 100 kHz and some conclusions with respect to the usefulness of rock salt as a neutrino detector. The experience bases on long-term acoustic emission measurements in a salt mine.

Acoustic wave propagation in one-dimensional phononic crystals containing Helmholtz resonators

2008 ◽  
Vol 103 (6) ◽  
pp. 064907 ◽  
Author(s):  
Zhi Guo Wang ◽  
Sam Hyeon Lee ◽  
Chul Koo Kim ◽  
Choon Mahn Park ◽  
Kyun Nahm ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Acoustic Wave ◽  
Phononic Crystals ◽  
Acoustic Wave Propagation ◽  
One Dimensional ◽  
Helmholtz Resonators

Simulation of Noise Attenuation Using One and Two Degree of Freedom Helmholtz Resonators in Pipelines

2012 ◽  
Author(s):  
Maaz Farooqui ◽  
Samir Mekid
Keyword(s):  
Numerical Simulation ◽  
Wave Propagation ◽  
Acoustic Wave ◽  
Degrees Of Freedom ◽  
Design Procedure ◽  
Experimental Results ◽  
Noise Attenuation ◽  
Acoustic Wave Propagation ◽  
Helmholtz Resonators ◽  
Two Degree Of Freedom

Helmholtz resonators are known to be efficient resonators for ducts if they are properly designed. A design procedure is suggested in this paper to identify the size of the resonators in one and two degrees of freedom. The procedure is supported by a through numerical simulation of acoustic wave propagation that is presented and is verified using published experimental results. The overall procedure shows achievable great attenuation of noise in pipeline.

The Zakharov–Kuznetsov equation for nonlinear ion-acoustic waves

1992 ◽  
Vol 47 (1) ◽  
pp. 75-83 ◽  
Author(s):  
K. Murawski ◽  
P. M. Edwin
Keyword(s):  
Wave Propagation ◽  
Fourier Transform ◽  
Acoustic Waves ◽  
Kutta Method ◽  
Acoustic Wave Propagation ◽  
Initial Value ◽  
Ion Acoustic Waves ◽  
Ion Acoustic Wave ◽  
Runge Kutta Method ◽  
Ion Acoustic

The Zakharov-Kuznetsov equation is used to describe ion-acoustic wave propagation in a magnetic environment. An initial-value problem is solved for this equation on the basis of a numerical method that uses the fast-Fourier-transform technique for calculating space derivatives and a fourth-order Runge-Kutta method for the time scheme. Numerical simulations show that the disturbed flat (planar) solitary waves can break up into more robust cylindrical ones. Interactions between these two types of wave, and recurrence phenomena, are also studied.

scholarly journals Acoustic wave propagation through solar granulation: Validity of effective-medium theories, coda waves

2020 ◽  
Vol 643 ◽  
pp. A168
Author(s):  
P.-L. Poulier ◽  
D. Fournier ◽  
L. Gizon ◽  
T. L. Duvall
Keyword(s):  
Wave Propagation ◽  
Acoustic Wave ◽  
Wave Field ◽  
Multiple Scattering ◽  
Acoustic Waves ◽  
Wave Speed ◽  
Coda Waves ◽  
Acoustic Wave Propagation ◽  
Solar Granulation ◽  
Effective Wave

Context. The frequencies, lifetimes, and eigenfunctions of solar acoustic waves are affected by turbulent convection, which is random in space and in time. Since the correlation time of solar granulation and the periods of acoustic waves (∼5 min) are similar, the medium in which the waves propagate cannot a priori be assumed to be time independent. Aims. We compare various effective-medium solutions with numerical solutions in order to identify the approximations that can be used in helioseismology. For the sake of simplicity, the medium is one dimensional. Methods. We consider the Keller approximation, the second-order Born approximation, and spatial homogenization to obtain theoretical values for the effective wave speed and attenuation (averaged over the realizations of the medium). Numerically, we computed the first and second statistical moments of the wave field over many thousands of realizations of the medium (finite-amplitude sound-speed perturbations are limited to a 30 Mm band and have a zero mean). Results. The effective wave speed is reduced for both the theories and the simulations. The attenuation of the coherent wave field and the wave speed are best described by the Keller theory. The numerical simulations reveal the presence of coda waves, trailing the ballistic wave packet. These late arrival waves are due to multiple scattering and are easily seen in the second moment of the wave field. Conclusions. We find that the effective wave speed can be calculated, numerically and theoretically, using a single snapshot of the random medium (frozen medium); however, the attenuation is underestimated in the frozen medium compared to the time-dependent medium. Multiple scattering cannot be ignored when modeling acoustic wave propagation through solar granulation.

Transmission Line Modeling of Laminar Liquid Wave Propagation in Tapered Tubes

2019 ◽  
Vol 141 (10) ◽  
Author(s):  
Travis Wiens ◽  
Jeremy ven der Buhs
Keyword(s):  
Wave Propagation ◽  
Transmission Line ◽  
High Frequency ◽  
Transfer Functions ◽  
Domain Modeling ◽  
Transmission Line Model ◽  
Computationally Efficient ◽  
Transmission Line Modeling ◽  
Time Domain Modeling ◽  
Pipe Inlet

This paper presents an improved method of time-domain modeling of pressure wave propagation through liquid media in rigid tapered pipes. The method is based on the transmission line model (TLM), which uses linear transfer functions and delays to calculate the pressures and/or flows at the pipe inlet and outlet. This method is computationally efficient and allows for variable rate simulation. The proposed form of the model differs from previous TLM models in the literature, allowing it to accurately model both low and high frequency characteristics.

Effect of Mean Flow on Acoustic Wave Propagation in a Duct with a Periodic Array of Helmholtz Resonators

2020 ◽  
Vol 37 (3) ◽  
pp. 034301
Author(s):  
Jiang-Wei Liu ◽  
Dian-Long Yu ◽  
Hai-Bin Yang ◽  
Hui-Jie Shen ◽  
Ji-Hong Wen
Keyword(s):  
Wave Propagation ◽  
Acoustic Wave ◽  
Periodic Array ◽  
Mean Flow ◽  
Acoustic Wave Propagation ◽  
Helmholtz Resonators
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