Influence of geometrical parameters of an acoustic black hole on sound radiation

Zhao, Chenhui; Prasad, Marehalli G.

doi:10.1121/1.4988528

Cited by 2 publications

(5 citation statements)

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“…where the exponent m is a positive rational number and 2, parameter is a constant, x is the distance from the tip of the power-law curve with residual thickness, and the scheme is shown in Figure 2. Schematic of a 1D ABH [27].…”

Section: Theoretical Analysismentioning

confidence: 99%

“…where T is the thickness of the beam, h 1 is the residual thickness of the ABH part, L ABH is the length of the ABH, and m is the exponent of the power-law profile [27].…”

Section: Theoretical Analysismentioning

confidence: 99%

“…The numerical study on the sound radiation from vibrating cantilever aluminum beams with various exponent m, which are 10 inches long, 1 inch wide, and 1/8 inch thick, with various shapes of ABHs at the free end, and the residual thickness h 1 equal to 1/64 inch is developed by Zhao and Prasad [27]. The results show that, in this group of beams with given residual thickness and length of the ABH, the concentration effect performs better when m is less than 5.…”

Section: Design Of 1d Abhmentioning

confidence: 99%

“…It is also noted that a 2D ABH can present larger LABH with minimal thickness and obtains larger modal density in the low-frequency range. The effect of the length of ABH is also investigated by Zhao and Prasad [8,27]. For a given beam at a given excitation frequency there are specific optimum values of LABH.…”

Section: Design Of 1d Abhmentioning

confidence: 99%

“…This indicates that the ABH is tunable by changing LABH to obtain a higher concentration of vibration energy [8]. The effect of the length of ABH is also investigated by Zhao and Prasad [8,27]. For a given beam at a given excitation frequency there are specific optimum values of L ABH .…”

Section: Design Of 1d Abhmentioning

confidence: 99%

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Acoustic Black Holes in Structural Design for Vibration and Noise Control

Zhao

Prasad

2019

Acoustics

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It is known that in the design of quieter mechanical systems, vibration and noise control play important roles. Recently, acoustic black holes have been effectively used for structural design in controlling vibration and noise. An acoustic black hole is a power-law tapered profile to reduce phase and group velocities of wave propagation to zero. Additionally, the vibration energy at the location of acoustic black hole increases due to the gradual reduction of its thickness. The vibration damping, sound reduction, and vibration energy harvesting are the major applications in structural design with acoustic black holes. In this paper, a review of basic theoretical, numerical, and experimental studies on the applications of acoustic black holes is presented. In addition, the influences of the various geometrical parameters and the configuration of acoustic black holes are presented. The studies show that the use of acoustic black holes results in an effective control of vibration and noise. It is seen that the acoustic black holes have a great potential for quiet design of complex structures.

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Section: Theoretical Analysismentioning

confidence: 99%

“…where T is the thickness of the beam, h 1 is the residual thickness of the ABH part, L ABH is the length of the ABH, and m is the exponent of the power-law profile [27].…”

Section: Theoretical Analysismentioning

confidence: 99%

Section: Design Of 1d Abhmentioning

confidence: 99%

Section: Design Of 1d Abhmentioning

confidence: 99%

Section: Design Of 1d Abhmentioning

confidence: 99%

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