scholarly journals Experimental investigation of the acoustic black hole effect for flexural waves in tapered plates

2007 ◽  
Vol 300 (1-2) ◽  
pp. 43-49 ◽  
Author(s):  
V.V. Krylov ◽  
R.E.T.B. Winward
Keyword(s):  
Experimental Investigation ◽  
Black Hole ◽  
Flexural Waves ◽  
Tapered Plates ◽  
Hole Effect

Experimental investigation of the acoustic black hole effect for vibration damping in elliptical plates

2008 ◽  
Vol 123 (5) ◽  
pp. 3318-3318 ◽  
Author(s):  
François Gautier ◽  
Jacques Cuenca ◽  
Victor V. Krylov ◽  
Laurent Simon
Keyword(s):  
Experimental Investigation ◽  
Black Hole ◽  
Vibration Damping ◽  
Hole Effect

scholarly journals Damping Enhancement Using Axially Functionally Graded Porous Structure Based on Acoustic Black Hole Effect

Materials ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2480 ◽  
Author(s):  
Weiguang Zheng ◽  
Shiming He ◽  
Rongjiang Tang ◽  
Shuilong He
Keyword(s):  
Black Hole ◽  
Reflection Coefficient ◽  
Porous Structure ◽  
Power Law ◽  
Transient Analysis ◽  
Functionally Graded ◽  
Flexural Waves ◽  
Damping Effect ◽  
Power Law Index ◽  
Hole Effect

The acoustic black hole (ABH) effect for damping flexural waves using axially functionally graded porous (FGP) structure is investigated. With proposed power-law porosity of FGP structure, ABH can be achieved and damping effect is enhanced. The physics are explained from divergent conditions of the integrated wave phase at composite ends. Numerical results show the damping effect is increased with power law index. The phenomenon is expounded by the characteristics of reflection coefficient and impedance. It indicates that increasing power law index leads to smaller wavelength along to the end, then the wave needs more oscillation cycles to travel, which leads to more energy absorption. Transient analysis for 2D FGP structure also shows the focalization and ABH effect of the flexural waves.

Interpretation of the Acoustic Black Hole effect based on the concept of critical coupling

2020 ◽  
Vol 471 ◽  
pp. 115199 ◽  
Author(s):  
J. Leng ◽  
V. Romero-García ◽  
A. Pelat ◽  
R. Picó ◽  
J.-P. Groby ◽  
...  
Keyword(s):  
Black Hole ◽  
Critical Coupling ◽  
Hole Effect

scholarly journals Numerical and Experimental Study on Suppression Effect of Acoustic Black Hole on Vibration Transmission of Refrigerator Compressor

2021 ◽  
Vol 11 (18) ◽  
pp. 8622
Author(s):  
Xiaofei Du ◽  
Qidi Fu ◽  
Jianrun Zhang ◽  
Chaoyong Zong
Keyword(s):  
Numerical Simulation ◽  
Black Hole ◽  
Vibration Suppression ◽  
Structural Vibration ◽  
Flexural Wave ◽  
Response Analysis ◽  
Flexural Waves ◽  
Suppression Effect ◽  
Support Plate ◽  
The Time Domain

The acoustic black hole (ABH) structures have the potential to achieve structural vibration suppression and noise reduction through the effect of the ABH on the concentration and manipulation of flexural waves. In this paper, a new solution is proposed to embed 2-D ABHs on the support plate to suppress the transmission of compressor vibration to the refrigerator body. The vibration and acoustic measurement experiment of the compressor, the support plate and the refrigerator body, and the coherence analysis of the vibration signals and acoustic signal are carried out to determine the influence of the compressor vibration on the vibration of the refrigerator body and the radiation sound of the back wall. The concentration and manipulation effects of 2-D ABH on flexural waves are verified by numerical simulation of flexural wave propagation in the time domain. FEM models of the original support plate and the damping ABH support plate are established to investigate the comprehensive effect of the 2-D ABHs and the damping layers on the vibration characteristics of the support plate through vibration modal and dynamic response analysis. Numerical simulation results show that the 2-D damping ABHs can suppress the vibrations generated by the compressor at specific frequencies in the middle and high-frequency bands from being transmitted to the refrigerator body through the support plate.

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