Modeling of roughness effects on acoustic properties of micro-slits

Song, Siyuan; Yang, Xiaohu; Xin, Fengxian; Ren, Shu-Wei; Lu, Tian Jian

doi:10.1088/1361-6463/aa6fa1

Cited by 10 publications

(10 citation statements)

References 38 publications

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“…Three problems, Eqs. (12,13,14) are solved in order to retrieve the six JCAL parameters dening the porous medium's equivalent uid when the pressure wave travels in the z direction (Fig. 3).…”

Section: Transfer Matrix Methodsmentioning

confidence: 99%

“…Additive manufacturing has proved to be a versatile and promising tool to produce sound absorbing materials. Helmholtz resonators 9,10 showed that the acoustic parameters of the porous material strongly depend on several geometric parameters of the micro-structure and can be strongly aected by the manufacturing, such as change in the laments shape of micro-lattice 11 , presence of sinusoidal rugosity in micro slits 12 , and surface irregularities in packed micro tubes 13 .…”

Section: Introductionmentioning

confidence: 99%

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Acoustic modeling of micro-lattices obtained by additive manufacturing

et al. 2020

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The acoustic behavior of 3D printed micro-lattices is investigated to assess the impact of defects induced by the Fused Deposition Modeling technique on the parameters of the equivalent uid medium. It is shown that the manufacturing process leads to three types of non-trivial defects: elliptical lament section, lament section shrinkage and lament surface rugosity. Not considering these defects may lead to acoustic predictions errors such as an underestimation of around 0.1 of the rigid backing absorption coecient. Inverse characterization of seven homogeneous samples allows to t the acoustic prediction model considering this kind of defects.

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Section: Transfer Matrix Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Acoustic modeling of micro-lattices obtained by additive manufacturing

et al. 2020

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“…For the largest space coiling system, this was set using automatic boundary layer settings under COM-SOL, and absorptivity results were compared to user-specified boundary layer thicknesses at every 500 Hz step. It should be noted that (expected) surface roughness will increase the acoustic boundary layer thicknesses [20] and thus have an effect on the absorptivity, but this increase was not modelled in this paper as no definitive roughness measurements were available. In general, a five element per wavelength with the parameterised boundary layer meshing is the default setting used by COMSOL.…”

Section: Finite Element Modellingmentioning

confidence: 99%

The Influence of Additive Manufacturing Processes on the Performance of a Periodic Acoustic Metamaterial

Kennedy

Flanagan

Dowling

et al. 2019

International Journal of Polymer Science

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Advancements in 3D print technology now allow the printing of structured acoustic absorbent materials at the appropriate microscopic scale and sample sizes. The repeatability of the fundamental cell unit of these metamaterials provides a pathway for the development of viable macro models to simulate built-up structures based on detailed models of the individual cell units; however, verification of such models on actual manufactured structures presents a challenge. In this paper, a design concept for an acoustic benchmark metamaterial consisting of an interlinked network of resonant chambers is considered. The form chosen is periodic with cubes incorporating spherical internal cavities connected through cylindrical openings on each face of the cube. This design is amenable to both numerical modelling and manufacture through additive techniques whilst yielding interesting acoustic behaviour. The paper reports on the design, manufacture, modelling, and experimental validation of these benchmark structures. The behaviour of the acoustic metamaterial manufactured through three different polymer-based printing technologies is investigated with reference to the numerical models and a metal powder-based print technology. At the scale of this microstructure, it can be seen that deviations in surface roughness and dimensional fidelity have a comparable impact on the experimentally measured values of the absorption coefficient.

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“…Two ways of improving the low-frequency absorption of thin porous layers containing parallel uniform slits have been investigated. One involves varying the width of the slits in a sinusoidal manner [4]. The other is to introduce two arrays of slits at right angles to each other, one with relatively large and the other with relatively small widths [5].…”

Section: Introductionmentioning

confidence: 99%

“…The extended models are used to investigate the extent to which each form of microstructure either separately or in combination could be used to improve low-frequency absorption of a thin hard-backed layer. Numerical comparisons use microstructure dimensions on the order of those of metallic foams [1] or of those that have been used elsewhere [2][3][4][5]. The chosen dimensions are within the resolution of commonly-available 3D-printers (0.1 mm at present).…”

Section: Introductionmentioning

confidence: 99%

Microstructures for lowering the quarter wavelength resonance frequency of a hard-backed rigid-porous layer

Attenborough

2018

Applied Acoustics

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The Open University's repository of research publications and other research outputs Microstructures for lowering the quarter wavelength resonance frequency of a hard-backed rigid-porous layer Journal Item How to cite: Attenborough, Keith (2018). Microstructures for lowering the quarter wavelength resonance frequency of a hard-backed rigid-porous layer. Applied Acoustics, 130 pp. 188-194. For guidance on citations see FAQs.

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Modeling of roughness effects on acoustic properties of micro-slits

Cited by 10 publications

References 38 publications

Acoustic modeling of micro-lattices obtained by additive manufacturing

Acoustic modeling of micro-lattices obtained by additive manufacturing

The Influence of Additive Manufacturing Processes on the Performance of a Periodic Acoustic Metamaterial

Microstructures for lowering the quarter wavelength resonance frequency of a hard-backed rigid-porous layer

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