Breaking reciprocity and preserving-frequency using linear acoustic metamaterials

2021 ◽  
Vol 35 (06) ◽  
pp. 2150089
Author(s):  
Hongzhu Li ◽  
Qian Ding ◽  
Zhisai Ma ◽  
Qingquan Ren ◽  
Xiaofei Lyu ◽  
...  
Keyword(s):  
Black Holes ◽  
Wave Propagation ◽  
Acoustic Metamaterials ◽  
Nonlinear Materials ◽  
Time Modulation ◽  
Waveguide Devices ◽  
Simulation And Experiment ◽  
Nonlinear Acoustic ◽  
Acoustic Black Holes ◽  
Asymmetric Wave

In this paper, we introduce a linear waveguide implemented by cascading acoustic black holes (ABHs). The asymmetric wave propagation, up to 46 dB, is observed and verified in simulation and experiment. It is shown that, in comparison with the previous nonlinear acoustic diodes, our waveguide can rectify the sound without shifting the impinging sound frequency. The device is simple and easy-to-fabricate without using complex nonlinear materials and space–time modulation. This feature could open a new route for designing acoustic waveguide devices that preserve the key information.

scholarly journals QUASINORMAL MODES AND LATE-TIME TAILS OF CANONICAL ACOUSTIC BLACK HOLES

2007 ◽  
Vol 16 (07) ◽  
pp. 1211-1218 ◽  
Author(s):  
PING XI ◽  
XIN-ZHOU LI
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Wave Propagation ◽  
Angular Momentum ◽  
Numerical Method ◽  
Time Scale ◽  
Quasinormal Modes ◽  
Late Time ◽  
Classical Wave ◽  
Acoustic Black Holes

In this paper, we investigate the evolution of classical wave propagation in the canonical acoustic black hole by a numerical method and discuss the details of the tail phenomenon. The oscillating frequency and damping time scale both increase with the angular momentum l. For lower l, numerical results show the lowest WKB approximation gives the most reliable result. We also find that the time scale of the interim region from ringing to tail is not affected obviously by changing l.

scholarly journals Wave propagation in one-dimensional nonlinear acoustic metamaterials

2017 ◽  
Vol 19 (5) ◽  
pp. 053007 ◽  
Author(s):  
Xin Fang ◽  
Jihong Wen ◽  
Bernard Bonello ◽  
Jianfei Yin ◽  
Dianlong Yu
Keyword(s):  
Wave Propagation ◽  
Acoustic Metamaterials ◽  
One Dimensional ◽  
Nonlinear Acoustic

scholarly journals Prestress-controlled asymmetric wave propagation and reciprocity-breaking in tensegrity metastructure

2020 ◽  
Vol 37 ◽  
pp. 100724 ◽  
Author(s):  
Yitian Wang ◽  
Weijia Zhao ◽  
Julian J. Rimoli ◽  
Rui Zhu ◽  
Gengkai Hu
Keyword(s):  
Wave Propagation ◽  
Asymmetric Wave

scholarly journals Supersonic velocities in noncommutative acoustic black holes

2012 ◽  
Vol 85 (2) ◽  
Author(s):  
M. A. Anacleto ◽  
F. A. Brito ◽  
E. Passos
Keyword(s):  
Black Holes ◽  
Supersonic Velocities ◽  
Acoustic Black Holes

Sound absorption based on Micro-perforated panels and Acoustic Black Hole principle

2021 ◽  
Vol 263 (6) ◽  
pp. 548-555
Author(s):  
Xiaoqi Zhang ◽  
Li Cheng
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Sound Absorption ◽  
Practical Application ◽  
Inner Radius ◽  
Simulation Results ◽  
Structural Configurations ◽  
Acoustic Black Holes ◽  
Sound Reduction ◽  
Bending Wave

Acoustic black holes (ABHs) have been so far investigated mainly for bending wave ma-nipulation in mechanical structures such as beams or plates. The investigations on ABHs for sound wave manipulation, referred to as Sonic black holes (SBHs) are scarce. Existing SBH structure for sound reduction in air is typically formed by putting a set of rings inside a duct wall with decreasing inner radius according to a power law. As such, the structure is very complex and difficult to be practically realized, which hampers the practical application of SBHs for sound reduction. This study explores the possibilities of achieving SBH effects using other types of structural configurations. In particular, micro-perforated panels are proposed to be introduced into the conventional SBH structure, and the simulation results show that the new formed SBH structure is simpler in configuration in terms of number of rings and more efficient in terms of sound energy trapping and dissipation.

scholarly journals Bridging-Coupling Band Gaps in Nonlinear Acoustic Metamaterials

2018 ◽  
Vol 10 (5) ◽  
Author(s):  
Xin Fang ◽  
Jihong Wen ◽  
Dianlong Yu ◽  
Jianfei Yin
Keyword(s):  
Band Gaps ◽  
Acoustic Metamaterials ◽  
Nonlinear Acoustic

Wave propagation in acoustic metamaterials with resonantly shunted cross-shape piezos

2018 ◽  
Vol 29 (13) ◽  
pp. 2744-2753 ◽  
Author(s):  
Shengbing Chen
Keyword(s):  
Wave Propagation ◽  
Band Gap ◽  
Vibration Isolation ◽  
Band Gaps ◽  
Acoustic Metamaterials ◽  
Resonant Frequencies ◽  
Piezoelectric Patch ◽  
Transmission Properties ◽  
Gap Width ◽  
Band Gap Width

Cross-shape piezoelectric patches were originally proposed to improve the band-gap properties of acoustic metamaterials with shunting circuits. The dispersion curves are characterized through the application of finite element method. Also, the theoretical band-gap predictions are verified by simulation results obtained from COMSOL. The investigation results show that the proposed scheme distinguishes itself from the conventional square patches by broader band gaps, whose bandwidth is almost doubled. The inherent capacitance of the piezoelectric patch is strongly related to the boundary conditions, so the local resonant band gap is strongly affected by the shape of piezoelectric patches as well. As a result, the band-gap width and location of metamaterials with different shape patches are rather different, even with the same size patches. Also, negative modulus (NM) and Poisson’s ratio were observed around the resonant frequencies. The transmission properties of finite periods agree well with band-gap predictions. An obvious attenuation zone (AZ) is produced around the band-gap location, in which the wave propagation is decayed strongly. Similarly, the width of AZ of the proposed metamaterial is much larger than that of the conventional one. Hence, the proposed scheme demonstrates more advantages in the application to vibration isolation when compared with the conventional.

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