Passive constrained viscoelastic layers to improve the efficiency of truncated acoustic black holes in beams

Deng, Jie; Zheng, Ling; Zeng, Pengyun; Zuo, Yifang; Guasch, Oriol

doi:10.1016/j.ymssp.2018.08.053

Cited by 117 publications

(54 citation statements)

References 29 publications

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“…Experimental evidence of ABH effect using a variety of beam-like and plate-like structures are also numerous [6,[10][11][12][13]. Recent analytical advances for the exact solutions of ABHs in beam structures are shown in [14], and the numerical and experimental contributions that aims at optimizing the design of ABHs for vibration suppression have been discussed in [15][16][17][18][19] for various structures. In addition, applications of ABH to other areas, including elastic metastructures [20], energy harvesting [21], vibro-impact systems [22] and cochlear systems, have also been investigated.…”

Section: Introductionmentioning

confidence: 99%

Combining nonlinear vibration absorbers and the Acoustic Black Hole for passive broadband flexural vibration mitigation

Touzé

Pelat

et al. 2021

International Journal of Non-Linear Mechanics

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The Acoustic Black Hole (ABH) effect refers to a special vibration damping technique adapted to thin-walled structures such as beams or plates. It usually consists of a local decrease of the structure thickness profile, associated to a thin viscoelastic coating placed in the area of minimum thickness. It has been shown that such structural design acts as an efficient vibration damper in the high frequency range, but not at low frequencies. This paper investigates how different types of vibration absorbers, linear and nonlinear, added to the primary system can improve the low frequency performance of a beam ABH termination. In particular, the conjugated effects of the Acoustic Black Hole effect and a Tuned Mass Damper (TMD), a Nonlinear Energy Sink (NES), a bi-stable NES (BNES), and a vibro-impact ABH (VI-ABH) are investigated. Forced response to random excitation are computed in the time domain using a modal approach combined with an energy conserving numerical scheme. Frequency indicators are defined to characterize and compare the performance of all solutions. The simulation results clearly show that all the proposed methods are able to damp efficiently the flexural vibrations in a broadband manner. The optimal tuning of each proposed solution is then investigated through a thorough parametric study, showing how to optimize the efficiency of each solution. In particular, TMD and VI-ABH show a slight dependence on vibration amplitude, while the performance of NES and BNES have a peak of efficiency for moderate amplitudes.

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Section: Introductionmentioning

confidence: 99%

Combining nonlinear vibration absorbers and the Acoustic Black Hole for passive broadband flexural vibration mitigation

Touzé

Pelat

et al. 2021

International Journal of Non-Linear Mechanics

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“…Theoretical and numerical works have been realised to model the reflection coefficient of ABH beam termination [7,8], to study the increase of modal damping ratios and modal overlap factor [9], and to optimize the design of ABH structures and its damping layer [10][11][12][13], including new shapes of ABH such as spiral [14] or distributions of ABHs embedded in plate-like structures [15]. Other studies consider the ABH effect as a mean for energy harvesting [16].…”

Section: Introductionmentioning

confidence: 99%

A vibro-impact acoustic black hole for passive damping of flexural beam vibrations

Touzé

Pelat

et al. 2019

Journal of Sound and Vibration

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Nonlinear flexural vibrations of slender beams holding both an Acoustic Black Hole termination and a contact non-linearity are numerically studied. The Acoustic Black Hole (ABH) effect is a passive vibration mitigation technique, which has shown attractive properties above a given cut-on frequency. In this contribution, a vibro-impact acoustic black hole (VI-ABH) is introduced, the contact nonlinearity being used as a mean to transfer energy from low to high frequencies. A numerical model of a VI-ABH is derived from an Euler-Bernoulli beam. The contact law is handled with a penalization approach, the visco-elastic layer with a Ross-Kerwin-Ungard model and the problem is solved with a modal approach combined with an energy-conserving time integration scheme. Numerical results show that the VI-ABH brings about important modifications, and changes the nature of more traditional black holes, by redistributing all the vibrational energy. It can lead to a strong decrease of the resonance magnitude at low frequencies. Under steady state noise excitation, parametric studies are realised in the cases of a single contact, a grid of contacts and bilateral contacts layouts, in order to find some optimal designs. Transient dynamics is also studied through the analysis of displacement signal envelope and energy decay time. All the numerical results constantly show that the combination the ABH effect and an energy transfer provided by contact nonlinearity leads to very attractive mitigation template including low frequencies.

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“…The ABH structures have exhibited obvious broadband characteristics for the aggregation effect of the flexural wave. These above characteristics of the acoustic black hole play an important role in applications such as vibration reduction [21,22], noise reduction, and energy recovery [23,24]. For an isotropic plate, Equation (7) can be simplified to:…”

Section: Theory Of Transmission Lossmentioning

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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Passive constrained viscoelastic layers to improve the efficiency of truncated acoustic black holes in beams

Cited by 117 publications

References 29 publications

Combining nonlinear vibration absorbers and the Acoustic Black Hole for passive broadband flexural vibration mitigation

Combining nonlinear vibration absorbers and the Acoustic Black Hole for passive broadband flexural vibration mitigation

A vibro-impact acoustic black hole for passive damping of flexural beam vibrations

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

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