Acoustic properties of periodic micro-structures obtained by additive manufacturing

Fotsing, Edith Roland; Dubourg, Arnaud; Ross, Annie; Mardjono, Jacky

doi:10.1016/j.apacoust.2018.12.030

Cited by 59 publications

(23 citation statements)

References 20 publications

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“…treatments have yet been optimized and precisely manufactured to the author's knowledge. Fortunately, recent improvements in additive manufacturing have allowed the production of efficient acoustic treatments such as helical metametarials 12,13 , slow-sound based metamaterials 6,14 and porous open-cells materials 15 . This technology enables an efficient control of the micro-structure 2 design, because the pore shapes and dimensions can be simply adjusted for the target macroscopic properties.…”

Section: Introductionmentioning

confidence: 99%

Optimally graded porous material for broadband perfect absorption of sound

Boulvert

Cavalieri

Costa-Baptista

et al. 2019

Journal of Applied Physics

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This article presents a numerical optimization procedure of continuous gradient porous layer properties to achieve perfect absorption under normal incidence. This design tool is applied on a graded porous medium composed of a periodic arrangement of ordered unit cells allowing to link the effective acoustic properties to its geometry. The best microgeometry continuous gradient providing the optimal acoustic reflection and/or transmission is designed via a nonlinear conjugate gradient algorithm. The acoustic performances of the so-designed continuous graded material are discussed with respect to the optimized homogeneous, i.e. non-graded, and monotonically graded material. The numerical results show a shifting of the perfect absorption peak to lower frequencies or a widening of the perfect absorption frequency range for graded materials when compared to uniform ones. The results are validated experimentally on 3D-printed samples therefore confirming the relevance of such gradient along with the efficiency of the control of the entire design process.

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Section: Introductionmentioning

confidence: 99%

Optimally graded porous material for broadband perfect absorption of sound

Boulvert

Cavalieri

Costa-Baptista

et al. 2019

Journal of Applied Physics

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“…[86] Copyright 2017, The Authors, published by Springer Nature Limited), b) labyrinthine structures [1,5,42,43,74,93,95,96,160,161] (Image reproduced with permission. [74] Copyright 2013, AIP Publishing LLC), and c) crystal lattice structures [40,60,62,76,82,83,84,94,97,98,103,104,162] (Image reproduced with permission. [84] Copyright 2020, AIP Publishing LLC).…”

Section: Discussionmentioning

confidence: 99%

Fabricating and Assembling Acoustic Metamaterials and Phononic Crystals

et al. 2020

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Acoustic metamaterials (AMMs) and phononic crystals (PCs) have garnered significant attention in recent years, as part of the collective driving force toward creating intelligent acoustic devices. Advancements in these fields have greatly enhanced the way we manipulate sound waves through transmission, reflection, refraction, absorption, diffraction, or attenuation. In the past decade, AMMs and PCs have enabled novel applications such as acoustic lensing, [1-3] cloaking, [4] levitation, [5] and holography. [6-8] While these exotic structures have been well explored through theoretical and numerical analysis, [9-13] their physical realization is an important topic that is rarely discussed. Considering the ubiquity of sound and the powerful capabilities of AMMs and PCs, the impact of these acoustic structures could be phenomenal. Across the full acoustic frequency spectrum, practical applications such as noise cancellation, [14] underwater detection, [15] medical imaging, [16] and energy harvesting [17,18] could benefit key sectors in our society like healthcare, well-being, environmental sustainability, and security. Moreover, AMMs and PCs can help to usher in next-generation technologies for personalized, immersive multisensory [19-22] experiences. The manipulation of sound can enrich the way we communicate and interact with our surroundings, not simply through audio, but also through tactile sensations. In the future, AMMs and PCs could be used in virtual reality (VR) setups, [23] compact wearable devices, and dynamic midair volumetric displays [24] that are controllable and capable of providing haptic feedback. [25] Beyond the notion that AMMs and PCs can replace phased arrays, they could readily complement one another for more precise control. In commercial devices, AMM and PC functionalities could even be combined together in different ways, e.g., transmissive and sound absorptive structures, for improved performance. To unlock the full potential of AMMs and PCs, it is therefore vital to ensure that practical, physical realization is pursued alongside theoretical investigation in the development of viable acoustic designs. Building an AMM or PC requires some form of fabrication or assembly or both. Fabrication refers to the technologies and processes used to manufacture an object, whereas assembly refers to the strategic amalgamation of parts for a constructive purpose.

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“…From an analytical point of view, the JCA model parameter, i.e., flow resistivity (σ), porosity (ϕÞ, tortuosity (α ∞ ), and characteristic lengths (Λ, Λ'), can be determined using Eqs (10)-(14) [49]. These equations are derived by considering some general assumptions such as periodicity of the microstructures, interconnected pore structures, and small Knudsen number values (ratio of the gas molecular size to a characteristic pore size):…”

Section: Acoustic Model Parametersmentioning

confidence: 99%

Thermal and Acoustic Numerical Simulation of Foams for Constructions

Caniato¹,

D’Amore²,

Kašpar³

2020

Foams - Emerging Technologies

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Cellular foams are widely employed as insulation materials, both thermal and acoustic, often in competition with traditional fibrous insulation material, e.g., rock wool. As for the acoustic and thermal properties, several models have been developed to predict acoustic properties of poroelastic materials, but they are usually applied to fibrous layers or polyurethane foams, whereas their application to new materials like complex cellular foams has not been assessed due to the different cell microstructures. There is a very strong interest both in industrial and academic in developing novel insulation materials; accordingly, the possibility of ideally designing the cellular foam microstructure to achieve desired acoustic performances appears a highly attractive target. The paper will first discuss the state-of-the-art acoustic and thermal models and their application to cellular foam materials. Then a novel sustainable alginate-based foam material will be analyzed as a case study, by focusing the aspects related to their microstructure and acoustic properties. For the derivation of an acoustic model, the determination of the parameters of Johnson-Champoux-Allard (JCA) acoustic model (tortuosity, viscous characteristic length, thermal characteristic length, porosity, and flow resistivity) was performed using five different forecasting methods, including traditional analytical model for fibrous materials as well as inverse procedure.

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Acoustic properties of periodic micro-structures obtained by additive manufacturing

Cited by 59 publications

References 20 publications

Optimally graded porous material for broadband perfect absorption of sound

Optimally graded porous material for broadband perfect absorption of sound

Fabricating and Assembling Acoustic Metamaterials and Phononic Crystals

Thermal and Acoustic Numerical Simulation of Foams for Constructions

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