One-dimensional acoustic waves in retarding structures with propagation velocity tending to zero

Mironov, M. A.; Pislyakov, Vladimir

doi:10.1134/1.1478121

Cited by 94 publications

(50 citation statements)

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“…This observation even less conclusive in the polymer case which still yields a quasi-constant correction length close to 1 on the 0-4 kHz range. This correction length phenomenon has been theoretically shown by Mironov [28] in the case of a retarding tube termination, constituting the acoustical analogy of the ABH termination for flexural waves studied in this paper.…”

Section: Phase Of the Reflection Coefficient And Equivalent Length Ofmentioning

confidence: 84%

Measurement and modelling of the reflection coefficient of an Acoustic Black Hole termination

Denis

Gautier

Pelat

et al. 2015

Journal of Sound and Vibration

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a b s t r a c tThe flexural waves propagating in a beam can be efficiently absorbed if one extremity is tapered with a power law profile and covered by a thin layer of additional damping material. Such a termination induces the so-called "Acoustic Black Hole effect" (ABH): if the thickness decreases locally, flexural waves slow down and the amplitude of the displacement field increases, leading to efficient energy dissipation if an absorbing layer is placed where the thickness is minimum. This paper presents a specific study of the reflection coefficient of ABH beam terminations. A Kundt-like measurement method of the reflection coefficient of a beam termination is proposed. The method is validated using theoretical results in the case of a beam free end. Results for several ABH extremities show a clear decrease of the modulus of the reflection coefficient R. The phase of R due to the decreasing thickness profile is also investigated and is interpreted by defining a correction length for the tapered termination. These experimental results are compared with several models: geometrical acoustics based model, beam waveguide model and plate model.

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Section: Phase Of the Reflection Coefficient And Equivalent Length Ofmentioning

confidence: 84%

Measurement and modelling of the reflection coefficient of an Acoustic Black Hole termination

Denis

Gautier

Pelat

et al. 2015

Journal of Sound and Vibration

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“…This indicates that engine covers with ABHs can decrease the sound radiation from the vehicle engine. An experimental study on sound absorption in air of ABH based inhomogeneous acoustic waveguides [50] was developed by Azbaid et al [51,52]. The inner radius of the structures as shown in Figure 28 An experimental study on sound absorption in air of ABH based inhomogeneous acoustic waveguides [50] was developed by Azbaid et al [51,52].…”

Section: Application Of Abh To Sound Reductionmentioning

confidence: 99%

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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“…Mironov proposed an acoustic black hole pipe structure. By gradually increasing the effective admittance of the pipe along the axial direction, the velocity of the sound wave propagating along the pipe is gradually reduced to zero [5]. Bowyer et al conducted experimental studies on sound radiation of vibrating rectangular plates containing tapered indentations of power-law profile [6] and found that when a very thin damping material is attached to an acoustic black hole region, the radiated sound power of the structure is reduced by 10 to 18 dB compared with the uniform thickness plate in the frequency range of 1 to 3 kHz [7].…”

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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One-dimensional acoustic waves in retarding structures with propagation velocity tending to zero

Cited by 94 publications

References 1 publication

Measurement and modelling of the reflection coefficient of an Acoustic Black Hole termination

Measurement and modelling of the reflection coefficient of an Acoustic Black Hole termination

Acoustic Black Holes in Structural Design for Vibration and Noise Control

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

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