Low-frequency sound absorption of elastic micro-perforated plates in a parallel arrangement

Kim, Hyun‐Sil; Ma, Pyung-Sik; Kim, Bong-Ki; Kim, Sang-Ryul; Lee, Seong-Hyun

doi:10.1016/j.jsv.2019.114884

Cited by 36 publications

(11 citation statements)

References 34 publications

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“…For MCPs, minute tubes radius with respect to the channels length ensures that these end-effects are negligible with respect to the inner effects described by Eq. (14). They are even further reduced due to paramount hole interaction effects, for instance by a factor 8 when s ¼ 50% [42].…”

Section: Mcps Morphology Usage and Fabricationmentioning

confidence: 99%

“…withk 0;r ¼ Àj ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi Z v;r Y t; r p a complex wavenumber that accounts for viscothermal attenuation at the adaptor walls, r 0 being replaced by r c in Eqs. (14) and (20) to get Z v;r and Y t; r in continuum regime. The absorption coefficient is then readily obtained from Eq.…”

Section: Experimental Studymentioning

confidence: 99%

“…They showed wideband absorption performance caused by cross-coupling mechanisms between the resonators. Compound serial-parallel arrangements of rigid [13] or elastic [14] MPP absorbers were found to further extend the bandwidth to higher frequencies. Other strategies such as extended rigid [15] or flexible [16] tubes in the cavity are able to downshift the Helmholtz-type resonances to lower frequencies due to an increase of the effective acoustic path length.…”

Section: Introductionmentioning

confidence: 98%

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Wideband sound absorption and transmission through micro-capillary plates: Modelling and experimental validation

Maury

Bravo

2020

Journal of Sound and Vibration

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The current work presents theoretical and experimental studies that investigate sound propagation through micro-capillary plates (MCP) under a general plane wave excitation and in the no-flow case. MCPs are characterized by micrometric channels radius with Knudsen number greater than 0.001 so that a slip-flow model has been derived for their viscous transfer impedance. It is found that the slip-flow model should be used instead of the continuum model to predict the transfer impedance of MCPs with channels radii lower than 2 mm as well as their absorption coefficient under near-grazing incident excitations.Otherwise, both approaches provide similar results, as confirmed by comparison with finite element simulations. Due to their high porosity, MCPs provide minute reactance and constant resistance that can be tailored to achieve target absorption over a broad frequency range. Plane wave impedance tube experiments have shown that a near-optimal MCP termination can provide a low frequency flat absorption spectrum that stays above 0.7 up to a Helmholtz number of 1.84. Measurements on rigidly-backed MCPs have led to ultra-wideband absorption with a half-bandwidth spanning up to 12 octaves around the absorber Helmholtz resonance. Expressions have been derived to find the optimal channels radius that maximize the MCPs dissipation under general incidence angle and assuming anechoic or rigid backing. The sensitivity of the MCPs optimal transfer resistance to their load impedance has been examined. It provides a design chart to find the MCP optimal parameters that achieve specific broadband absorption value under general incidence and practical load conditions.

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Section: Mcps Morphology Usage and Fabricationmentioning

confidence: 99%

Section: Experimental Studymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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Wideband sound absorption and transmission through micro-capillary plates: Modelling and experimental validation

Maury

Bravo

2020

Journal of Sound and Vibration

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“…Conventional materials have a limited ability to control low-frequency noise. Thus, due to their excellent low-frequency acoustic performance, micro-perforated plates have been extensively studied by scientific researchers [1][2][3]. In micro-perforated plates, the diameter of perforation is less than 1 mm; therefore, the broadband sound absorption effect is better than the resonance sound absorption in conventional perforated plates.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Sound Absorption and Insulation Performances of a Dual-Cavity Resonant Micro-Perforated Plate

Chen¹,

Guo²,

Feng³

et al. 2022

Fluid Dynamics &Amp; Materials Processing

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This study investigates a dual-cavity resonant composite sound-absorbing structure based on a micro-perforated plate. Using the COMSOL impedance tube model, the effects of various structural parameters on sound absorption and sound insulation performances are analyzed. Results show that the aperture of the micro-perforated plate has the greatest influence on the sound absorption coefficient; the smaller the aperture, the greater is this coefficient. The thickness of the resonance plate has the most significant influence on the sound insulation and resonance frequency; the greater the thickness, the wider the frequency domain in which sound insulation is obtained. In addition, the effect of filling the structural cavity with porous foam ceramics has been studied, and it has been found that the porosity and thickness of the porous material have a significant effect on the sound absorption coefficient and sound insulation, while the pore size exhibits a limited influence.

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“…21,22 Several reports about the preparation of composite sound-absorbing structures have been published, regarding unique composite structures of membrane and perforated sound-absorbing structures. Based on the principle of the internal resonance effect, 23 these composite sound-absorbing structures can achieve excellent sound absorption performance at mid-low frequency, 24,25 while maintaining good sound absorption performance at high frequency with the help of the principle of porous sound absorption. 26 Therefore, these composite sound-absorbing structures are expected to have a significant impact on specific engineering applications.…”

mentioning

confidence: 99%

The review of fiber-based sound-absorbing structures

Zhang

Gong

et al. 2022

Textile Research Journal

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According to the World Health Organization, noise pollution is second only to air pollution in its impact on health and the environment. Fiber-based sound-absorbing structures have great application potential in the field of sound absorption and noise reduction because they can provide a wider sound absorption range than traditional porous fiber materials, and at the same time have the advantages of light weight, low cost and strong processability. Consequently, significant research interest in the field of noise control has been directed into the study of composite sound-absorbing materials based on porous fiber materials. In this review, we have summarized manifold theoretical structures based on fiber materials, such as multilayer structure, porous micro/nano structure, membrane sound-absorbing structure and perforated resonance structure of fiber-based sound-absorbing structures, aiming to illustrate that the structure must affect the sound absorption performance of the material. The focus is on the research and development of the design concepts, and preparation methods of fiber-based acoustic structures are reviewed. Finally, this review concludes with the prospects and outlook for fiber-based acoustic structures. We hope that this article which reviews the structure design principle and preparation method of fiber-based sound-absorbing structures can give inspirations for readers.

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Low-frequency sound absorption of elastic micro-perforated plates in a parallel arrangement

Cited by 36 publications

References 34 publications

Wideband sound absorption and transmission through micro-capillary plates: Modelling and experimental validation

Wideband sound absorption and transmission through micro-capillary plates: Modelling and experimental validation

Optimization of Sound Absorption and Insulation Performances of a Dual-Cavity Resonant Micro-Perforated Plate

The review of fiber-based sound-absorbing structures

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