Multi-objective optimization of acoustic black hole vibration absorbers

Shepherd, Micah R.; Feurtado, Philip A.; Conlon, Stephen C.

doi:10.1121/1.4961735

Cited by 39 publications

(14 citation statements)

References 9 publications

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“…For instance, adding a platform at the ABH termination enhances its low frequency performance to some extent [28]. Also, multi-objective optimization [29][30][31] and data-driven schemes [32] have been proposed to modify the ABH thickness profile and achieve a better overall frequency response. However, the most promising strategies for broadband vibration reduction are based on combining the ABH effect with some other technique relying on different background physics, that could be effective at low frequencies.…”

Section: Introductionmentioning

confidence: 99%

A metamaterial consisting of an acoustic black hole plate with local resonators for broadband vibration reduction

Deng

Guasch

Maxit

et al. 2022

Journal of Sound and Vibration

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Section: Introductionmentioning

confidence: 99%

A metamaterial consisting of an acoustic black hole plate with local resonators for broadband vibration reduction

Deng

Guasch

Maxit

et al. 2022

Journal of Sound and Vibration

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“…The former comprise from placing a simple viscoelastic layer at the ABH tip [27,28], a constrained one [19], or to extend the ABH ending platform [29,30], among other options. More recently, optimization algorithms have been suggested to properly distribute the damping material or ABH profile to reduce vibration [31][32][33][34] and sound radiation [35].…”

Section: Introductionmentioning

confidence: 99%

Vibration of cylindrical shells with embedded annular acoustic black holes using the Rayleigh-Ritz method with Gaussian basis functions

Deng

Guasch

Maxit

et al. 2021

Mechanical Systems and Signal Processing

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The numerical simulation of beams and plates with embedded acoustic black holes (ABHs) is computationally demanding because of the very thin thickness attained at the ABH central area. Semi-analytical approaches relying on the Rayleigh-Ritz method with wavelet or Gaussian basis functions have thus revealed as an accurate and fast alternative to determine the ABH vibration field in parametric studies. To date however, the vast majority of works on ABHs have only dealt with ABH indentations on straight beams and flat plates. It would be also worth exploring the feasibility of ABHs to control the vibrations of curved shells, typically found in aerospace and naval structures. In this work, we address this issue and extend the Gaussian expansion method (GEM) to characterize annular ABHs embedded on cylindrical shells. First, we show how the GEM can be modified to make Gaussian shape functions satisfy periodic boundary conditions in the circumferential direction of the cylinder. The GEM is then used to determine the vibration field of the ABH cylindrical shell and gets validated by comparison with finite element simulations. A thorough analysis of the performance of the annular ABH follows, which stresses the differences with the behavior of ABHs on flat surfaces. In particular, we show the influence that waves propagating in the circumferential direction have on the operational frequency range of the ABH. The effects of the viscoelastic layer and the inclusion of longitudinal stiffeners to strengthen the cylinder rigidity are also analyzed by means of the proposed GEM approach. This work broadens previous semi-analytical methods to start investigating the ABH effect on curved structures.

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“…The unit cell of hollow metamaterial structure is made up by rotating acoustical black hole contour by its own geometric axis, therefore, it has degrees of freedom in three-dimensional space. Which is different from planar structure in earlier researches [29], [31]- [34]. On XY plane, geometric dimensions of the unit cell shown in Fig.…”

Section: Model Structure Designmentioning

confidence: 68%

Elastic Wave Modulation in Hollow Metamaterial Beam With Acoustic Black Hole

et al. 2019

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We propose and discuss the elastic wave attenuation of hollow metamaterial beam embedded acoustic black hole. More abundant physical phenomena are given by modal analysis, shows that the band gap of three-dimensional acoustic black hole metamaterial is different from two-dimensional one. Lateral flexural vibrations occurs and make the original first two-dimensional band gap be compressed, and the opening of first three-dimensional band gap are caused by coupling effect between the longitudinal and lateral flexural vibrations. Below 1200Hz, only two band gaps exist, the geometric parameter m1 and angle γ could affect the band structure a lot, while the effect of geometric parameter m0 is a little less. Mutual validation of transmission spectra of vibration test and finite element analysis calculation and band gaps, illustrating its validity of the structure design, corresponding results could stimulate the realizations of three-dimensional acoustic black hole structure, particularly paves the way for the bridge from the corresponding theory of low frequency vibration and noise reduction to the practical application.INDEX TERMS Acoustic black hole, band gap, metamaterial beam, vibration test.

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Multi-objective optimization of acoustic black hole vibration absorbers

Cited by 39 publications

References 9 publications

A metamaterial consisting of an acoustic black hole plate with local resonators for broadband vibration reduction

A metamaterial consisting of an acoustic black hole plate with local resonators for broadband vibration reduction

Vibration of cylindrical shells with embedded annular acoustic black holes using the Rayleigh-Ritz method with Gaussian basis functions

Elastic Wave Modulation in Hollow Metamaterial Beam With Acoustic Black Hole

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