Three dimensional zero-index acoustic metamaterials (Conference Presentation)

2020 ◽  
Author(s):  
Changqing Xu ◽  
Guancong Ma ◽  
Yun Lai ◽  
Ying Wu
Keyword(s):  
Three Dimensional ◽  
Acoustic Metamaterials ◽  
Zero Index

Engineering three-dimensional labyrinthine fractal acoustic metamaterials with low-frequency multi-band sound suppression

2021 ◽  
Vol 149 (1) ◽  
pp. 308-319
Author(s):  
Xianfeng Man ◽  
Baizhan Xia ◽  
Zhen Luo ◽  
Jian Liu ◽  
Kun Li ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Low Frequency ◽  
Acoustic Metamaterials ◽  
Sound Suppression ◽  
Multi Band

Acoustical Scattering by Multilayer Spherical Objects Containing Electrorheological Fluid

2009 ◽  
Author(s):  
Liang-Wu Cai ◽  
Dacio K. Dacol ◽  
Gregory J. Orris ◽  
David C. Calvo ◽  
Michael Nicholas
Keyword(s):  
Acoustic Wave ◽  
Fundamental Problem ◽  
Fluid Layer ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Electrorheological Fluid ◽  
Acoustic Metamaterials ◽  
Spherical Object ◽  
Spherical Scatterer ◽  
Acoustic Media

Scattering is the most fundamental problem in the research on phononic crystals and acoustic metamaterials; and scattering in a three-dimensional space poses challenging issues; and yet, the most challenging of all, is the scattering by elastic objects since an acoustic wave splits into different types of waves, propagating at different speeds, when it enters an elastic object. In this paper, a unified formalism is developed to analyze the scattering of an acoustic wave by a multilayer spherical object that is made of a mixture of an arbitrary number of concentric layers of elastic and acoustic media. Using this formalism, acoustical scattering by a multilayer spherical scatterer encasing an electrorheological (ER) fluid layer in an underwater environment is studied. Numerical examples show that ER fluids can alter the scattering characteristics above the first resonant frequency, which itself can be tuned by the applied electric field.

Design and characterization of tunable three-dimensional acoustic composite metamaterials

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Guochang Lin ◽  
Chaonan Hu ◽  
Lin Cong ◽  
Yongtao Yao
Keyword(s):  
Elastic Modulus ◽  
Structural Material ◽  
Cell Structure ◽  
Three Dimensional ◽  
Sound Insulation ◽  
Acoustic Metamaterials ◽  
Content Type ◽  
Acoustic Metamaterial ◽  
Material Parameters ◽  
Initial Frequency

Purpose The purpose of this paper is to developing a kind of acoustic metamaterial with wide frequency band especially in low frequency region. At the same time, its the tunability of sound insulation frequency is achieved. Design/methodology/approach A three-dimensional (3D) acoustic metamaterial consisting of rigid frame, spherical attachment and thin film is proposed. The material parameters and the effect of the attachment hole on the forbidden band are investigated by finite element simulation. The sound insulation effect of the structure is validated by the combination of simulation and experiment. Findings The results show that the elastic modulus of the structural material determines the initial frequency of the forbidden band of the proposed 3D acoustic metamaterials. The lower the elastic modulus of the structural material, the lower the initial frequency of the forbidden band. The material parameters of the frame mainly affect the initial frequency of the first forbidden band, and the material parameters of the attachment will affect both the initial and termination frequency of the first forbidden band. Holes in the attachments reduce the band gap width. The characteristic curve moves down with the increase of subtracted mass. Research limitations/implications The findings may greatly benefit the application of the acoustic metamaterials in the fields of sound insulation and noise reduction. Originality/value This acoustic metamaterial structure has excellent sound insulation performance. At the same time, the single cell structure can be assembled into any shape. The structure can achieve sound selective filtering and combination control.

scholarly journals Three-dimensional Ultrathin Planar Lenses by Acoustic Metamaterials

2014 ◽  
Vol 4 (1) ◽  
Author(s):  
Yong Li ◽  
Gaokun Yu ◽  
Bin Liang ◽  
Xinye Zou ◽  
Guangyun Li ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Acoustic Metamaterials

scholarly journals Wavefront manipulation by acoustic metasurfaces: from physics and applications

Nanophotonics ◽  
2018 ◽  
Vol 7 (6) ◽  
pp. 1191-1205 ◽  
Author(s):  
Bin Liang ◽  
Jian-chun Cheng ◽  
Cheng-Wei Qiu
Keyword(s):  
Acoustic Waves ◽  
Review Paper ◽  
Three Dimensional ◽  
New Physics ◽  
Research Field ◽  
Acoustic Metamaterials ◽  
Future Directions ◽  
Practical Applications ◽  
The Past ◽  
Recent Developments

AbstractMolding the wavefront of acoustic waves into the desired shape is of paramount significance in acoustics, which however are usually constrained by the acoustical response of naturally available materials. The emergence of acoustic metamaterials built by assembling artificial subwavelength elements provides distinct response to acoustic waves unattainable in nature. More recently, acoustic metasurfaces, a class of metamaterials with a reduced dimensionality, empower new physics and lead to extended functionalities different from their three-dimensional counterparts, enabling controlling, transmitted or reflected acoustic waves in ways that were not possible before. In this review paper, we present a comprehensive view of this rapidly growing research field by introducing the basic concepts of acoustic metasurfaces and the recent developments that have occurred over the past few years. We review the interesting properties of acoustic metasurfaces and their important functionalities of wavefront manipulation, followed by an outlook for promising future directions and potential practical applications.

Scattering of waves by three-dimensional obstacles in elastic metamaterials with zero index

2016 ◽  
Vol 94 (22) ◽  
Author(s):  
Fengming Liu ◽  
Feng Zhang ◽  
Wei Wei ◽  
Ni Hu ◽  
Gang Deng ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Elastic Metamaterials ◽  
Zero Index
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