Propagation of flexural waves in inhomogeneous plates exhibiting hysteretic nonlinearity: Nonlinear acoustic black holes

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.

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Acoustic ‘black holes’ for flexural waves as effective vibration dampers

Journal of Sound and Vibration ◽

10.1016/j.jsv.2003.05.010 ◽

2004 ◽

Vol 274 (3-5) ◽

pp. 605-619 ◽

Cited By ~ 151

Author(s):

V.V. Krylov ◽

F.J.B.S. Tilman

Keyword(s):

Black Holes ◽

Flexural Waves ◽

Acoustic Black Holes ◽

Vibration Dampers

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Slots of Power-Law Profile as Acoustic Black Holes for Flexural Waves in Metallic and Composite Plates

Structures ◽

10.1016/j.istruc.2016.02.002 ◽

2016 ◽

Vol 6 ◽

pp. 48-58 ◽

Cited By ~ 10

Author(s):

E.P. Bowyer ◽

V.V. Krylov

Keyword(s):

Black Holes ◽

Power Law ◽

Composite Plates ◽

Flexural Waves ◽

Acoustic Black Holes

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Supersonic velocities in noncommutative acoustic black holes

Physical Review D ◽

10.1103/physrevd.85.025013 ◽

2012 ◽

Vol 85 (2) ◽

Cited By ~ 17

Author(s):

M. A. Anacleto ◽

F. A. Brito ◽

E. Passos

Keyword(s):

Black Holes ◽

Supersonic Velocities ◽

Acoustic Black Holes

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

INTER-NOISE and NOISE-CON Congress and Conference Proceedings ◽

10.3397/in-2021-1560 ◽

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.

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