Experimental study of sound radiation by plates containing circular indentations of power-law profile

Bowyer, E.P.; Krylov, Victor V.

doi:10.1016/j.apacoust.2014.07.014

Cited by 72 publications

(27 citation statements)

References 12 publications

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“…ABH effect attracts increasing attention as a promising passive vibration control method because vibration energy can be channeled and only a very small amount of damping materials is required at the energy focalization region to achieve efficient damping to flexural waves [4][5][6][7][8][9]. It also shows appealing potential in sound radiation control [10,11] and energy harvesting [12,13] due to the high energy concentration within a confined area. Krylov et al [3] showed that the inevitable truncation (the residual thickness at the wedge tip) resulting from the manufacturing difficulty would significantly compromise the ideal ABH effect by generating wave reflections.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Acoustic Black Hole effect in beams with a modified thickness profile and extended platform

Tang

2017

Journal of Sound and Vibration

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The phenomenon of Acoustics Black Hole (ABH) benefits from the bending wave propagating properties inside a thin-walled structure with power-law thickness variation to achieve zero reflection when the structural thickness approaches zero in the ideal scenario.However, manufacturing an ideally tailored power-law profile of a structure with embedded ABH feature can hardly be achieved in practice. Past research showed that the inevitable truncation at the wedge tip of the structure can significantly weaken the expected ABH effect by creating wave reflections. On the premise of the minimum achievable truncation thickness by the current manufacturing technology, exploring ways to ensure and achieve better ABH effect becomes important. In this paper, we investigate this issue by using a previously developed wavelet-decomposed semi-analytical model on an Euler-Bernoulli beam with a modified power-law profile and an extended platform of constant thickness. Through comparisons with the conventional ABH profile in terms of system loss factor and energy distribution, numerical results show that the modified thickness profile brings about a systematic increase in the ABH effect at mid-to-high frequencies, especially when the truncation thickness is small and the

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Section: Introductionmentioning

confidence: 99%

Enhanced Acoustic Black Hole effect in beams with a modified thickness profile and extended platform

Tang

2017

Journal of Sound and Vibration

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“…Such two-dimensional acoustic black holes and their combinations are also subject to extensive theoretical and experimental research (see e.g. [18,[29][30][31][32][33][34]).…”

Section: The Physical Principle Of Acoustic Black Holesmentioning

confidence: 99%

Overview of localised flexural waves in wedges of power-law profile and comments on their relationship with the acoustic black hole effect

Krylov¹

2020

Journal of Sound and Vibration

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In the present paper, the relationship between localised flexural waves in wedges of powerlaw profile and flexural wave reflection from acoustic black holes is examined. The geometrical acoustics theory of localised flexural waves in wedges of power-law profile is briefly discussed. It is noted that, for wedge profiles with power-law exponents equal or larger than two, the velocities of all localised modes take zero values, unless there is a wedge truncation. It is demonstrated that this effect of zero velocities of localised flexural waves in ideal wedges is closely related to the phenomenon of zero reflection of flexural waves from ideally sharp one-dimensional acoustic black holes. A possible influence of localised wedge modes on flexural wave reflection from one-dimensional acoustic black holes having rough edges is discussed. With regard to two-dimensional acoustic black holes, the role of localised flexural waves propagating along wedge edges that are curved in their middle plane is considered. Such waves can propagate along edges of inner holes in two-dimensional acoustic black holes formed by circular indentations in plates of constant thickness. A possible impact of such localised waves on the processes of scattering of flexural waves by edge imperfections of inner holes in two-dimensional acoustic black holes is discussed, including their influence on the efficiency of two-dimensional acoustic black holes as vibration dampers.

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“…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]. Feurtado experimentally analyzed the influence of the diameter of the damping layer on the radiated sound of rectangular plates with 4×5 array of embedded ABHs in the full frequency range [8].…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of sound transmission loss of circular plates embedded with acoustic black hole

Zhang¹,

Du²

2020

Vib. proced.

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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. These characteristics could be applied in vibration reduction, noise attenuation or improving sound insulation. To investigate the sound transmission loss of circular plates embedded with acoustic black hole, 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 the simulation results show that the circular plate with a single ABH embedded in the center position can significantly improve the sound transmission loss in stiffness-controlled region, and at the first-order resonance frequency.

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Experimental study of sound radiation by plates containing circular indentations of power-law profile

Cited by 72 publications

References 12 publications

Enhanced Acoustic Black Hole effect in beams with a modified thickness profile and extended platform

Enhanced Acoustic Black Hole effect in beams with a modified thickness profile and extended platform

Overview of localised flexural waves in wedges of power-law profile and comments on their relationship with the acoustic black hole effect

Numerical investigation of sound transmission loss of circular plates embedded with acoustic black hole

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