Topological valley states in sonic crystals with Willis coupling

2021 ◽  
Vol 119 (5) ◽  
pp. 051903
Author(s):  
Hongfei Qu ◽  
Xiaoning Liu ◽  
Gengkai Hu
Keyword(s):  
Sonic Crystals

scholarly journals Topological refraction in dual-band valley sonic crystals

2021 ◽  
Vol 103 (14) ◽  
Author(s):  
Ding Jia ◽  
Yong Ge ◽  
Haoran Xue ◽  
Shou-qi Yuan ◽  
Hong-xiang Sun ◽  
...  
Keyword(s):  
Dual Band ◽  
Sonic Crystals

On the acoustic effects of sonic crystals in heat exchanger arrangements

2021 ◽  
Vol 182 ◽  
pp. 108253
Author(s):  
Felix Czwielong ◽  
Viktor Hruška ◽  
Michal Bednařík ◽  
Stefan Becker
Keyword(s):  
Heat Exchanger ◽  
Sonic Crystals

Acoustic metamaterials of sonic crystals

2008 ◽  
Author(s):  
Yan-Feng Chen ◽  
Ming-Hui Lu ◽  
Liang Feng ◽  
Yong-Yuan Zhu ◽  
Shi-Ning Zhu ◽  
...  
Keyword(s):  
Acoustic Metamaterials ◽  
Sonic Crystals

scholarly journals Valley Topological Phases in Bilayer Sonic Crystals

2018 ◽  
Vol 120 (11) ◽  
Author(s):  
Jiuyang Lu ◽  
Chunyin Qiu ◽  
Weiyin Deng ◽  
Xueqin Huang ◽  
Feng Li ◽  
...  
Keyword(s):  
Topological Phases ◽  
Sonic Crystals

Square-root-like higher-order topological states in three-dimensional sonic crystals

2021 ◽  
Author(s):  
Zhiguo Geng ◽  
Huanzhao Lv ◽  
Zhan Xiong ◽  
Yu-Gui Peng ◽  
Zhaojiang Chen ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Surface States ◽  
Higher Order ◽  
Square Root ◽  
Root Lattice ◽  
Third Order ◽  
Topological Materials ◽  
Topological States ◽  
Sonic Crystal ◽  
Sonic Crystals

Abstract The square-root descendants of higher-order topological insulators were proposed recently, whose topological property is inherited from the squared Hamiltonian. Here we present a three-dimensional (3D) square-root-like sonic crystal by stacking the 2D square-root lattice in the normal (z) direction. With the nontrivial intralayer couplings, the opened degeneracy at the K-H direction induces the emergence of multiple acoustic localized modes, i.e., the extended 2D surface states and 1D hinge states, which originate from the square-root nature of the system. The square-root-like higher order topological states can be tunable and designed by optionally removing the cavities at the boundaries. We further propose a third-order topological corner state in the 3D sonic crystal by introducing the staggered interlayer couplings on each square-root layer, which leads to a nontrivial bulk polarization in the z direction. Our work sheds light on the high-dimensional square-root topological materials, and have the potentials in designing advanced functional devices with sound trapping and acoustic sensing.

Numerical study for increasement of low frequency sound insulation of double-panel structure using sonic crystals with distributed Helmholtz resonators

2019 ◽  
Vol 33 (14) ◽  
pp. 1950138
Author(s):  
Myong-Jin Kim
Keyword(s):  
Free Space ◽  
Transmission Loss ◽  
Numerical Study ◽  
Low Frequency ◽  
Helmholtz Resonator ◽  
Sound Insulation ◽  
The Finite Element Method ◽  
Helmholtz Resonators ◽  
Sonic Crystal ◽  
Sonic Crystals

Numerical simulations of the sound transmission loss (STL) of a double-panel structure (DPS) with sonic crystal (SC) comprised of distributed local resonators are presented. The Local Resonant Sonic Crystal (LRSC) consists of “C”-shaped Helmholtz resonator columns with different resonant frequencies. The finite element method is used to calculate the STL of such a DPS. First, the STLs of LRSC in free space and the DPS with LRSC are calculated and compared. It is shown that the sound insulations of the local resonators inserted in the double panel are higher than that in free space for the same size of the SCs and the same number of columns. Next, STL of the DPS in which the SC composed of three columns of local resonators having the same outer and inner diameters but different slot widths are calculated, and a reasonable arrangement order is determined. Finally, the soundproofing performances of DPS with distributed LRSC are compared with the case of insertion of general cylindrical SC for SC embedded in glass wool and not. The results show that the sound insulation of the DPS can be significantly improved in the low frequency range while reducing the total mass without increasing the thickness.

The thermal effects on the negative refraction of sonic crystals

2008 ◽  
Vol 372 (15) ◽  
pp. 2701-2705 ◽  
Author(s):  
Liang-Yu Wu ◽  
Wen-Pei Yang ◽  
Lien-Wen Chen
Keyword(s):  
Thermal Effects ◽  
Negative Refraction ◽  
Sonic Crystals
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