A multilayer microperforated panel prototype for broadband sound absorption at low frequencies

Bucciarelli, Fabrizio; Fierro, Gian Piero Malfense; Meo, Michele

doi:10.1016/j.apacoust.2018.11.014

Cited by 81 publications

(27 citation statements)

References 13 publications

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“…To pursue high sound absorption, the forced resonance of membranes has been utilized in ultrathin metasurface resonators, [8][9][10] decorated membrane resonators, [11,12] metamaterials, [13,14] and micro-perforated panels. [15][16][17][18] This mechanism is replacing the linear response of frictional damping and wave velocity in pores of conventional materials, [11] overcoming the confined low-frequency sound attenuation. As to the thickness limit, graphene sheets with nonlinear damping behavior [19] can reasonably be harnessed to achieve new breakthrough in sound absorption, to meet the increasingly high requirements of acoustic protection in human hearing healthy, chips, and architectural design.…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient Cellular Acoustic Absorber of Graphene Ultrathin Drums

et al. 2022

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Atomically thin 2D graphene sheets exhibit unparalleled in‐plane stiffness and large out‐of‐plane elasticity, thereby providing strong mechanical resonance for nanomechanical devices. The exceptional resonance behavior of ultrathin graphene, which promises the fabrication of superior acoustic absorption materials, however, remains unfulfilled for the lack of applicable form and assembly methods. Here, a highly efficient acoustic absorber is presented, wherein cellular networks of ultrathin graphene membranes are constructed into polymer foams. The ultrathin graphene drums exhibit strong resonances and efficiently dissipate sound waves in a broad frequency range. A record specific noise reduction coefficient (51.3 at 30 mm) is achieved in the graphene‐based acoustic absorber, fully realizing the superior resonance properties of graphene sheets. The scalable method facilely transforms commercial polymer foams to superior acoustic absorbers with a ≈320% enhancement in average absorption coefficient across wide frequencies from 200 to 6000 Hz. The graphene acoustic absorber offers a convenient method to exploit the extraordinary resonance properties of 2D sheets, opening extensive new applications in noise protection, building design, instruments and acoustic devices.

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Section: Introductionmentioning

confidence: 99%

Highly Efficient Cellular Acoustic Absorber of Graphene Ultrathin Drums

et al. 2022

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“…Considering now the MPPHCMPPHC where the embedded Go foil is replaced by a second MPP. As demonstrated in previous work 43 , the effect on the sound absorption of a MPP series is to sum the single MPP contribution. Then the absorption profile is characterized by two main absorption peaks, the first one at same frequency of the MPPHC structure associated to the first MPP backed by 50 mm thickness of acoustic resonant volume, and the second one related to second MPP which is backed by a smaller resonator acoustic volume (25 mm).…”

Section: Results and Commentsmentioning

confidence: 82%

Graphite-oxide hybrid multi-degree of freedom resonator metamaterial for broadband sound absorption

Bucciarelli

Fierro

Rapisarda

et al. 2022

Sci Rep

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Low frequency broadband sound absorption for thin structures is still a great challenge. A new concept of a stackable hybrid resonator metamaterial is proposed which exhibits super broadband low-frequency sound absorption. The proposed metamaterial is based on micrometric scale thickness Graphene Oxide (GO) embedded in a stacked structure or used as external skin in a designed honeycomb (HC) structure. The stackable nature of the proposed structure allows the GO-HC cores to be embedded within micro-perforated panels (MPP) providing enhanced stiffness/strength to the structure and high absorption characteristics. We demonstrate how the exploitation of the GO elastic and mass properties result in multiple hybrid structural–acoustic resonances. These resonances are tailored to occur in a frequency range of interest by the theoretical calculation of the sound absorption coefficient. The theoretical model combines the mutual interaction between the structural dynamic of the GO foil and acoustic higher modes of the HC core cell as well as stacked MPP-HC/GO-HC cores. The result is a multi-degree of freedom hybrid resonator which provides subwavelength scale broadband sound absorption in low frequency range between 300 and 2500 Hz.

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“…The various values of each input variable (parameter) are itemized in Table 1. The parameters have been specified according to literature as a simple case chosen for the building acoustics application (Liu et al, 2017;Bucciarelli et al, 2019).…”

Section: Central Composite Designmentioning

confidence: 99%

An Empirical Model for Optimizing the Sound Absorption of Single Layer MPP Based on Response Surface Methodology

Esraa¹,

putra²,

Mosa³

et al. 2022

IJTech

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Micro-perforated panel (MPP) is a thin panel absorber capable of absorbing sound energy at a targeted frequency range by adjusting the MPP parameters. An analytical model is available, but it is not a direct, convenient method for practitioners to determine the required MPP parameters. This paper presents an optimized empirical model to calculate the sound absorption coefficient of a single-layer MPP. The response surface methodology is employed for a simple case to generate a second-order polynomial model through a sequence of designing processes to analyze the functional relationships and variation of the outcome performance (sound absorption coefficient) concerning the MPP parameters, namely the panel thickness, hole diameter, perforation ratio, and the depth of the back air layer. The analysis is carried out for frequencies between 300 to 900 Hz. The predicted data (empirical) is compared with the actual data (analytical), leading to a coefficient of variation of 0.145%. The proposed empirical model can be used as a method to select the suitable MPP parameters according to the targeted frequency bandwidth of absorption with less computational time.

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A multilayer microperforated panel prototype for broadband sound absorption at low frequencies

Cited by 81 publications

References 13 publications

Highly Efficient Cellular Acoustic Absorber of Graphene Ultrathin Drums

Highly Efficient Cellular Acoustic Absorber of Graphene Ultrathin Drums

Graphite-oxide hybrid multi-degree of freedom resonator metamaterial for broadband sound absorption

An Empirical Model for Optimizing the Sound Absorption of Single Layer MPP Based on Response Surface Methodology

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