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.

Acoustic Wave Propagation in Standing Trees – Part 1. Numerical Simulation

2020 ◽  
Vol 52 (1) ◽  
pp. 53-72
Author(s):  
Fenglu Liu ◽  
Xiping Wang ◽  
Houjiang Zhang ◽  
Fang Jiang ◽  
Wenhua Yu ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Wave Propagation ◽  
Acoustic Wave ◽  
Acoustic Wave Propagation ◽  
Standing Trees

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

scholarly journals Peculiarities of the Acoustic Wave Propagation in Diamond-Based Multilayer Piezoelectric Structures as “Me1/(Al,Sc)N/Me2/(100) Diamond/Me3” and “Me1/AlN/Me2/(100) Diamond/Me3” under Metal Thin-Film Deposition

Electronics ◽  
2022 ◽  
Vol 11 (2) ◽  
pp. 176
Author(s):  
Gennady Kvashnin ◽  
Boris Sorokin ◽  
Nikita Asafiev ◽  
Viacheslav Prokhorov ◽  
Andrei Sotnikov
Keyword(s):  
Wave Propagation ◽  
Acoustic Wave ◽  
Quality Factor ◽  
Metal Layer ◽  
Thin Film Deposition ◽  
Acoustic Resonator ◽  
Film Deposition ◽  
Experimental Results ◽  
Acoustic Wave Propagation ◽  
Piezoelectric Structures

New theoretical and experimental results of microwave acoustic wave propagation in diamond-based multilayer piezoelectric structures (MPS) as “Me1/(Al,Sc)N/Me2/(100) diamond/Me3” and “Me1/AlN/Me2/(100) diamond/Me3” under three metal film depositions, including the change in the quality factor Q as a result of Me3 impact, were obtained. Further development of our earlier studies was motivated by the necessity of creating a sensor model based on the above fifth layered MPS and its in-depth study using the finite element method (FEM). Experimental results on the change in operational checkpoint frequencies and quality factors under the effect of film deposition are in satisfactory accordance with FEM data. The relatively small decrease in the quality factor of diamond-based high overtone bulk acoustic resonator (HBAR) under the metal layer effect observed in a wide microwave band could be qualified as an important result. Changes in operational resonant frequencies vs. film thickness were found to have sufficient distinctions. This fact can be quite explained in terms of the difference between acoustic impedances of diamond and deposited metal films.

Numerical Simulation of Acoustic Wave Propagation in Cylindrical Fluid-Saturated Poroelastic Shell Immersed in Fluids

2011 ◽  
Vol 105-107 ◽  
pp. 127-131
Author(s):  
Wen Yang Gao ◽  
Qian Wu ◽  
Zhi Wen Cui ◽  
Kei Xie Wang ◽  
He Feng Dong
Keyword(s):  
Numerical Simulation ◽  
Cylindrical Shell ◽  
Wave Propagation ◽  
Acoustic Wave ◽  
Acoustic Pressure ◽  
Fluid Pressure ◽  
Longitudinal Mode ◽  
Stoneley Wave ◽  
Acoustic Wave Propagation ◽  
Full Waveform

Acoustic wave propagation in fluid-saturated porous cylindrical shell is investigated in this paper by using the Biot’s theory. The Expressions for acoustic pressure and radical displacement in and out fluid, the expressions for components of solid and filtration displacement and pore fluid pressure and stress tensor are given. The numerical simulation is operated on acoustic field in fluid of poroelastic cylindrical shell, and the full-waveform is obtained by Fourier transform, and acoustic pressure field in frequency-wavenumber domain is analyzed, as well as the influence of inner and outer radii on wave amplitude is discussed. It shows that if the thickness of shell remains constant, the amplitude of longitudinal mode increases and that of Stoneley wave decreases when inner and outer radii increasing. In the fast formation the influence of inner and outer radii on the amplitude of longitudinal mode is notable. In the slow formation the amplitude of Stoneley wave will decrease with inner and outer radii increasing.

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