Tunable broadband unidirectional acoustic transmission based on a waveguide with phononic crystal

2016 ◽  
Vol 122 (8) ◽  
Author(s):  
Ailing Song ◽  
Tianning Chen ◽  
Xiaopeng Wang ◽  
Lele Wan
Keyword(s):  
Phononic Crystal ◽  
Acoustic Transmission

Waveform-preserved unidirectional acoustic transmission based on impedance-matched acoustic metasurface and phononic crystal

2016 ◽  
Vol 120 (8) ◽  
pp. 085106 ◽  
Author(s):  
Ai-Ling Song ◽  
Tian-Ning Chen ◽  
Xiao-Peng Wang ◽  
Le-Le Wan
Keyword(s):  
Phononic Crystal ◽  
Acoustic Transmission

scholarly journals Non-reciprocal acoustics in a viscous environment

2020 ◽  
Vol 476 (2244) ◽  
pp. 20200657
Author(s):  
Hyeonu Heo ◽  
Ezekiel Walker ◽  
Yurii Zubov ◽  
Dmitrii Shymkiv ◽  
Dylan Wages ◽  
...  
Keyword(s):  
Time Reversal ◽  
Phononic Crystal ◽  
Circular Cylinders ◽  
Inviscid Fluid ◽  
Transmission Spectra ◽  
Acoustic Transmission ◽  
Viscous Losses ◽  
Anisotropic Solid ◽  
Reported Study ◽  
Passive Acoustic

It is demonstrated that acoustic transmission through a phononic crystal with anisotropic solid scatterers becomes non-reciprocal if the background fluid is viscous. In an ideal (inviscid) fluid, the transmission along the direction of broken P symmetry is asymmetric. This asymmetry is compatible with reciprocity since time-reversal symmetry ( T symmetry) holds. Viscous losses break T symmetry, adding a non-reciprocal contribution to the transmission coefficient. The non-reciprocal transmission spectra for a phononic crystal of metallic circular cylinders in water are experimentally obtained and analysed. The surfaces of the cylinders were specially processed in order to weakly break P symmetry and increase viscous losses through manipulation of surface features. Subsequently, the non-reciprocal part of transmission is separated from its asymmetric reciprocal part in numerically simulated transmission spectra. The level of non-reciprocity is in agreement with the measure of broken P symmetry. The reported study contradicts commonly accepted opinion that linear dissipation cannot be a reason leading to non-reciprocity. It also opens a way for engineering passive acoustic diodes exploring the natural viscosity of any fluid as a factor leading to non-reciprocity.

scholarly journals Acoustic Tunneling Study for Hexachiral Phononic Crystals Based on Dirac-Cone Dispersion Properties

Crystals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1577
Author(s):  
Luyun Chen ◽  
Yong Liu ◽  
Hui Kong
Keyword(s):  
Phononic Crystal ◽  
Phononic Crystals ◽  
Tunneling Effect ◽  
Essential Property ◽  
Finite Width ◽  
Acoustic Transmission ◽  
Dirac Cone ◽  
Linear Dispersion ◽  
Accidental Degeneracy ◽  
Structure Inversion

Acoustic tunneling is an essential property for phononic crystals in a Dirac-cone state. By analyzing the linear dispersion relations for the accidental degeneracy of Bloch eigenstates, the influence of geometric parameters on opening the Dirac-cone state and the directional band gaps’ widths are investigated. For two-dimensional hexachiral phononic crystals, for example, the four-fold accidental degenerate Dirac point emerges at the center of the irreducible Brillouin zone (IBZ). The Dirac cone properties and the band structure inversion problem are discussed. Finally, to verify acoustic transmission properties near the double-Dirac-cone frequency region, the numerical calculation of the finite-width phononic crystal structure is carried out, and the acoustic transmission tunneling effect is proved. The results enrich and expand the manipulating method in the topological insulator problem for hexachiral phononic crystals.

Phononic-Crystal Acoustic Lens by Design for Energy-Transmission Devices

2012 ◽  
Vol 132 (5) ◽  
pp. 686-690
Author(s):  
Yusuke Kanno ◽  
Kenji Tsuruta ◽  
Kazuhiro Fujimori ◽  
Hideki Fukano ◽  
Shigeji Nogi
Keyword(s):  
Phononic Crystal ◽  
Energy Transmission ◽  
Acoustic Lens

Flexural Wave Band Gaps in Phononic Crystal Thick Plates with Defects

2019 ◽  
Author(s):  
Edson Jansen Pedrosa de Miranda Junior ◽  
Jose Maria Campos dos Santos
Keyword(s):  
Phononic Crystal ◽  
Band Gaps ◽  
Flexural Wave ◽  
Wave Band ◽  
Thick Plates

scholarly journals Tunable characteristics of low-frequency bandgaps in two-dimensional multivibrator phononic crystal plates under prestrain

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hai-Fei Zhu ◽  
Xiao-Wei Sun ◽  
Ting Song ◽  
Xiao-Dong Wen ◽  
Xi-Xuan Liu ◽  
...  
Keyword(s):  
Phononic Crystal ◽  
Real Life ◽  
Low Frequency ◽  
Acoustic Vibration ◽  
Crystal Plate ◽  
Frequency Noise ◽  
Two Dimensional ◽  
The Matrix ◽  
Noise Frequency ◽  
Realtime Control

AbstractIn view of the influence of variability of low-frequency noise frequency on noise prevention in real life, we present a novel two-dimensional tunable phononic crystal plate which is consisted of lead columns deposited in a silicone rubber plate with periodic holes and calculate its bandgap characteristics by finite element method. The low-frequency bandgap mechanism of the designed model is discussed simultaneously. Accordingly, the influence of geometric parameters of the phononic crystal plate on the bandgap characteristics is analyzed and the bandgap adjustability under prestretch strain is further studied. Results show that the new designed phononic crystal plate has lower bandgap starting frequency and wider bandwidth than the traditional single-sided structure, which is due to the coupling between the resonance mode of the scatterer and the long traveling wave in the matrix with the introduction of periodic holes. Applying prestretch strain to the matrix can realize active realtime control of low-frequency bandgap under slight deformation and broaden the low-frequency bandgap, which can be explained as the multiple bands tend to be flattened due to the localization degree of unit cell vibration increases with the rise of prestrain. The presented structure improves the realtime adjustability of sound isolation and vibration reduction frequency for phononic crystal in complex acoustic vibration environments.

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