Broadband low-frequency bidimensional honeycomb lattice metastructure based on the coupling of subwavelength resonators

Ramos, Denilson; Godinho, L.; Amado-Mendes, Paulo; Mareze, Paulo Henrique

doi:10.1016/j.apacoust.2022.109038

Cited by 13 publications

(3 citation statements)

References 48 publications

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“…However, the working frequencies of these AMs are often quite narrow, or the structures need to be bulky to enable broadband operation. To address this problem, the concept of 'rainbow trapping' in acoustic resonators with variable parameters, and hence working frequencies [17][18][19][20] or systems with asymmetric porous absorbers [21] has been adopted so far.…”

Section: Introductionmentioning

confidence: 99%

Efficient broadband sound absorption exploiting rainbow labyrinthine metamaterials

Nistri,

Kamrul,

Bettini

et al. 2024

J. Phys. D: Appl. Phys.

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In this work, we demonstrate in a proof of concept experiment the efficient noise absorption of a 3-D printed panel designed with appropriately arranged space-coiling labyrinthine acoustic elementary cells of various sizes. The labyrinthine unit cells are analytically and numerically analysed to determine their absorption characteristics and then fabricated and experimentally tested in an impedance tube to verify the dependence of absorption characteristics on cell thickness and lateral size. The resonance frequency of the unit cell is seen to scale approximately linearly with respect to both thickness and lateral size in the considered range, enabling easy tunability of the working frequency. Using these data, a flat panel is designed and fabricated by arranging cells of different dimensions in a quasi-periodic lattice, exploiting the acoustic “rainbow” effect, i.e. superimposing the frequency response of the different cells to generate a wider absorption spectrum, covering the target frequency range, chosen between 800 and 1400 Hz. The panel is thinner and more lightweight compared to traditional sound absorbing solutions and designed in modular form, so as to be applicable to different geometries. The performance of the panel is experimentally validated in a small-scale reverberation room, and an absorption close to ideal values is demonstrated at the desired frequencies of operation. Thus, this work suggests a design procedure for noise-mitigation panel solutions and provides experimental proof of the versatility and effectiveness of labyrinthine metamaterials for tunable mid- to low-frequency sound attenuation.

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Section: Introductionmentioning

confidence: 99%

Efficient broadband sound absorption exploiting rainbow labyrinthine metamaterials

Nistri,

Kamrul,

Bettini

et al. 2024

J. Phys. D: Appl. Phys.

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“…heating, ventilation and air conditioning systems, automotive and aeronautical engineering [1]. Acoustic metamaterials with negative bulk modulus based on the classic theory of Helmholtz resonators (HR) have repeatedly been shown to allow significant sound transmission loss by inducing passive flow in a lowfrequency regime with subwavelength dimensional structures [3]. Based on previously developed work [4], the present paper aims to assess and accurately model the sound transmission properties of an acoustic system composed by the in-parallel coupling of multiple subwavelength resonators and describe the grazing incidence wave propagation under a linear regime, by applying the Johnson-Champoux-Allard model for rigid frames [5,6] considering the estimations of transport parameters for rigid frame models.…”

Section: Introductionmentioning

confidence: 99%

Modelling the sound transmission properties of a side branch acoustic metamaterial using rigid frame porous model

Ramos,

Pompoli,

Marescotti

et al. 2024

Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023

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This paper presents a model to predict the sound transmission properties of a side branch acoustic metamaterial composed of coupled subwavelength Helmholtz resonators. A finite element model (FEM) is proposed to describe the grazing incidence wave propagation in Helmholtz resonators. The Viscothermal losses due to the solidfluid interaction on the boundary layer interface in the neck of resonators are considered by employing the classical fluid equivalent Johnson-Champoux-Allard (JCA) rigid frame approach. To validate the results, an experimental campaign was developed based on the four-microphone measurement method (ASTM E2611). As expected, the preliminary numerical results show good agreement when compared with experimental values. In turn, the approach presented here enables the coupling of multiple resonances of individual resonators under grazing incidence, which can be effectively used in designing compact attenuators with a wide frequency range, with potential application in different engineering contexts, especially in ventilated systems.

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“…Currently, a number of researchers optimize the structural parameters of metasurface with the developed optimization algorithms to achieve the desired absorption coefficients at the target frequencies. Sun et al, 14 Ryoo et al, 15 and Romas et al 16 solved the structural parameter optimization model with the sequential quadratic programming algorithm (SQP). Yan et al 17 employed the particle swarm optimization algorithm to optimize the structural parameters of single-layer honeycomb microperforated plate to construct a broadband sound absorber, and the sound absorption coefficient is all above 0.85 within the range of 1000–3500 Hz.…”

Section: Introductionmentioning

confidence: 99%

A parameter optimization method of multi-layer nested slit resonator for the converter transformer noise in high voltage direct current converter station

Li,

Sun,

et al. 2023

Noise & Vibration Worldwide

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We propose a parameter optimization method of multi-layer nested slit resonator (MNSR) for the converter transformer noise in a high voltage direct current (HVDC) converter station. With the optimization objective of achieving quasi-perfect sound absorption at the target frequencies and the structural parameters of MNSR as the optimization variables, the optimization model of the structural parameters of MNSR is established and then solved by the sequential quadratic programming algorithm (SQP). The theoretical and simulation results of the four validation cases show that the optimized MNSR can achieve quasi-perfect sound absorption at all target frequencies, which is consistent with the optimization objective. The parameter optimization design method provides an efficient method to design a dual-frequency quasi-perfect sound absorber for the converter transformer noise.

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Broadband low-frequency bidimensional honeycomb lattice metastructure based on the coupling of subwavelength resonators

Cited by 13 publications

References 48 publications

Efficient broadband sound absorption exploiting rainbow labyrinthine metamaterials

Efficient broadband sound absorption exploiting rainbow labyrinthine metamaterials

Modelling the sound transmission properties of a side branch acoustic metamaterial using rigid frame porous model

A parameter optimization method of multi-layer nested slit resonator for the converter transformer noise in high voltage direct current converter station

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