Sound radiation of a beam with a wedge-shaped edge embedding acoustic black hole feature

Li, Xi; Ding, Qian

doi:10.1016/j.jsv.2018.10.009

Cited by 68 publications

(25 citation statements)

References 22 publications

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“…A numerical and experimental study on sound radiation of a beam with a 1D ABH is developed by Li and Ding [55]. In Figure 38, it can be seen that the increase of the truncation thickness results in decrease of radiated sound power in the frequency from 43 to 160 Hz and increase from 626 Hz to 6 kHz.…”

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: Design Of 1d Abhmentioning

confidence: 99%

“…Sound radiation from the beams with various truncation thicknesses. Reprinted with permission from[55]. Copyright Elsevier, 2019.…”

mentioning

confidence: 99%

Acoustic Black Holes in Structural Design for Vibration and Noise Control

Zhao

Prasad

2019

Acoustics

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“…10 Up to now, most of previous work dealt with the free-field problems. [11][12][13][14] It is well accepted that the reduction of the radiation efficiency of ABH plates is the dominant mechanism behind the sound radiation reduction into free field. The ABH effect spreads the vibration energy out into higher wavenumber components, thus redistributing supersonic vibration energy into the subsonic region with a lower radiation capability.…”

Section: Introductionmentioning

confidence: 99%

Wavenumber domain analyses of vibro-acoustic decoupling and noise attenuation in a plate-cavity system enclosed by an acoustic black hole plate

Wang

Qiu

et al. 2019

The Journal of the Acoustical Society of America

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The acoustic black hole (ABH) effect is realized in thin plate structures with a decreasing thickness according to a power-law function, and offers potential applications for structure vibration damping enhancement and free-field noise radiation suppression. In this paper, a wavenumber domain method (WNDM) is proposed for the analysis of vibro-acoustic coupling and internal noise reduction mechanism of a pentahedral cavity enclosed by a flexible plate with a two-dimensional ABH indentation, subject to a point force excitation. The system response of the ABH plate-cavity is computed by a validated finite element model. The relationship between the space-averaged sound energy inside the cavity and the spectra of the structural displacement and the acoustic mode of the cavity is established. This allows revealing a dual physical mechanism behind the observed noise reduction: amplitude reduction and mismatching between the wavenumber spectra of the plate displacement and the acoustic field, which results in a weakened vibro-acoustic coupling. An additional configuration with an ABH embedded in an irregular pentagonal wall of the cavity is examined. Despite the increasing complexity in the geometry of the coupling interface and its coupling with the cavity, numerical analyses confirm the generality of the observed physical phenomena and the applicability of the proposed WNDM to more complex system configurations.

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“…Li et al established a two-dimensional daubechies wavelet (DW) model for the sound radiation prediction of plates embedded with a circular ABH indentation [12] and they proposed a general method for optimizing the layout of the surface coating damping layer of ABH plates by topology optimization method to minimize the sound radiation of ABH plates to free space in a given frequency or frequency band [13]. Li et al presented analytical solutions of sound radiation of a beam with a wedge-shaped edge embedding ABH by using the transfer matrix method (TMM) [14]. Ji et al established a numerical finite element model of acoustic radiation considering plate-cavity coupling and proposed that the damping enhancement and the coupling strength decreasing between the plate and the cavity are two mechanisms for the intracavity noise reduction [15].…”

Section: Introductionmentioning

confidence: 99%

Effects of Acoustic Black Hole Parameters and Damping Layer on Sound Insulation Performance of ABH Circular Plate

Huang

et al. 2019

Applied Sciences

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The acoustic black hole (ABH) can be utilized to achieve aggregation of flexural wave in structures with the feature that the thickness gradually reduced to zero with a power exponent no less than 2. The above characteristics could be applied in vibration reduction, noise attenuation or improving sound insulation. Previous literatures on vibration and acoustic characteristics of ABH structures mainly focus on the structural response under mechanical force excitation, while the transmission loss (TL) of circular plates embedded with two-dimensional ABHs investigated in this paper is a vibro-acoustic coupling procedure under excitation of diffuse sound field. Series of vibro-acoustic coupling finite element models (FEM) for TL analysis of ABH circular plates were established by automatic matched layer (AML) method in this paper and an experimental platform for measuring TLs of ABH circular plates and uniform plates was constructed. The accuracy of the FEM analysis was verified by experimental measurements. To systematically analyze the influence mechanism of parameters of the ABH on TLs of ABH circular plates, the effects of diameter, orientation, number, and truncation thickness of ABHs on TLs of ABH circular plates were further studied. The effect of the damping layer on TLs of circular plates embedded with 1 and 19 ABHs was also analyzed and it reveals that the influence of damping layer mainly concentrates on the first-order resonance frequency and damping-controlled region of the plate, and at some frequencies, the greater the damping layer thickness, the worse the sound insulation performance, despite that the modal damping loss factor has been increased in the whole frequency domain.

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Sound radiation of a beam with a wedge-shaped edge embedding acoustic black hole feature

Cited by 68 publications

References 22 publications

Acoustic Black Holes in Structural Design for Vibration and Noise Control

Acoustic Black Holes in Structural Design for Vibration and Noise Control

Wavenumber domain analyses of vibro-acoustic decoupling and noise attenuation in a plate-cavity system enclosed by an acoustic black hole plate

Effects of Acoustic Black Hole Parameters and Damping Layer on Sound Insulation Performance of ABH Circular Plate

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