scholarly journals Annular acoustic black holes to reduce sound radiation from cylindrical shells

2021 ◽  
Vol 158 ◽  
pp. 107722
Author(s):  
Jie Deng ◽  
Oriol Guasch ◽  
Laurent Maxit ◽  
Ling Zheng
Keyword(s):  
Black Holes ◽  
Cylindrical Shells ◽  
Sound Radiation ◽  
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
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