Sound energy enhancement via impedance-matched anisotropic metamaterial

Jia，Xiao1,2; Yan，Ming2; Hong，Minghui1

2021

10.1016/j.matdes.2020.109254

Materials and Design   影响因子和分区

0264-1275

1873-4197

Sound energy enhancement realized by electronic circuit designs plays a vital part in many fields, including acoustic communication, medical imaging, acoustic positioning and sound energy harvesting. The same effect, actually, can be achieved based on anisotropic acoustic meta-structures without electronic components, which has rarely been studied before. Fabricated by 3D printing technology, a two-way spiral-shaped metamaterial and its two-dimensional array are designed in the study, which is capable to realize sound energy enhancement. Due to the impedance matching design, the meta-structure shows almost opposite transmission behaviors in orthogonal directions. The sound wave compression and resonance effects come from the high-refractive-index medium, leading to enlarged acoustic signals inside the waveguide. For the array with an inside point sound source, an energy enhancement phenomenon occurs in the wave emission area outside the structure. Through experimental results and numerical simulations, it is revealed that the sound intensity of the emission wave can be increased more than fifteen-fold compared with the insulation condition in the range of 4.8–5.8 kHz, when the anisotropic metamaterial array is applied. The flexibility of the anisotropic meta-structure and corresponding array designs enables versatile applications demanding excellent sound signal and broadband performance.

Acoustic meta-structure Anisotropic property Fused deposition modeling Impedance matching effect Sound energy enhancement

SCI ; EI

英语

通讯

Natural Science Foundation of China[51971108] ; Shenzhen Science and Technology Innovation Commission["ZDSYS201703031748354","JCYJ20180504165824643"] ; Shenzhen Industrial and Information Technology Bureau[ZDYBH201900000009] ; CRP of Singapore National Research Foundation[NRF-CRP15-2015-04]

Materials Science

Materials Science, Multidisciplinary

WOS:000596076700008

ELSEVIER SCI LTD

20204409434146

Acoustic fields ; Acoustic impedance ; Metamaterials ; Impedance matching (electric) ; Energy harvesting ; Medical imaging ; 3D printers ; Anisotropy

Biomedical Engineering:461.1 ; Energy Conversion Issues:525.5 ; Light/Optics:741.1 ; Printing Equipment:745.1.1 ; Imaging Techniques:746 ; Acoustics, Noise. Sound:751 ; Acoustic Properties of Materials:751.2 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Materials Science:951

MATERIALS SCIENCE

2-s2.0-85094316226

Scopus

1.Department of Electrical and Computer Engineering,National University of Singapore,4 Engineering Drive 3,117583,Singapore
2.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Jia，Xiao,Yan，Ming,Hong，Minghui. Sound energy enhancement via impedance-matched anisotropic metamaterial[J]. Materials and Design,2021,197.

Jia，Xiao,Yan，Ming,&Hong，Minghui.(2021).Sound energy enhancement via impedance-matched anisotropic metamaterial.Materials and Design,197.

Jia，Xiao,et al."Sound energy enhancement via impedance-matched anisotropic metamaterial".Materials and Design 197(2021).