Frequency attenuation band with low vibration transmission in a finite-size plate strip embedded with 2D acoustic black holes

2022 ◽  
Vol 163 ◽  
pp. 108149
Author(s):  
Hongli Ji ◽  
Bing Han ◽  
Li Cheng ◽  
Daniel J. Inman ◽  
Jinhao Qiu
Keyword(s):  
Black Holes ◽  
Finite Size ◽  
Vibration Transmission ◽  
Plate Strip ◽  
Acoustic Black Holes

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 Low reflection effect by 3D printed functionally graded acoustic black holes

2019 ◽  
Vol 450 ◽  
pp. 96-108 ◽  
Author(s):  
Wei Huang ◽  
Hui Zhang ◽  
Daniel J. Inman ◽  
Jinhao Qiu ◽  
Carlos E.S. Cesnik ◽  
...  
Keyword(s):  
Black Holes ◽  
Functionally Graded ◽  
Reflection Effect ◽  
3D Printed ◽  
Acoustic Black Holes

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 Amplifying the Hawking Signal in BECs

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Roberto Balbinot ◽  
Alessandro Fabbri
Keyword(s):  
Black Holes ◽  
Casimir Effect ◽  
Pair Creation ◽  
Time Dependent ◽  
Dynamical Casimir Effect ◽  
Hawking Effect ◽  
Acoustic Black Holes ◽  
Bose Einstein ◽  
Simple Models

We consider simple models of Bose-Einstein condensates to study analog pair-creation effects, namely, the Hawking effect from acoustic black holes and the dynamical Casimir effect in rapidly time-dependent backgrounds. We also focus on a proposal by Cornell to amplify the Hawking signal in density-density correlators by reducing the atoms’ interactions shortly before measurements are made.

scholarly journals Quantum-corrected finite entropy of noncommutative acoustic black holes

2015 ◽  
Vol 362 ◽  
pp. 436-448 ◽  
Author(s):  
M.A. Anacleto ◽  
F.A. Brito ◽  
G.C. Luna ◽  
E. Passos ◽  
J. Spinelly
Keyword(s):  
Black Holes ◽  
Acoustic Black Holes
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