Harnessing cavity dissipation for enhanced sound absorption in Helmholtz resonance metamaterials

Li, Xinwei; Chua, Jun Wei; Zhai, Wei

doi:10.1039/d3mh00428g

Cited by 14 publications

(11 citation statements)

References 43 publications

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“…FEA is mainly carried out using COMSOL Multiphysics, using the acoustics modules. [ 9 , 12 , 14 , 15 , 16 , 24 , 82 ] Typically, simulation is conducted by modeling the actual impedance tube using the transfer function specified in accordance with ASTM E1050‐19 standards. An example is shown in Figure 8 A .…”

Section: Finite Element Analysismentioning

confidence: 99%

3D‐Printed Lattice Structures for Sound Absorption: Current Progress, Mechanisms and Models, Structural‐Property Relationships, and Future Outlook

Li,

Chua,

et al. 2023

Advanced Science

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The reduction of noises, achieved through absorption, is of paramount importance to the well‐being of both humans and machines. Lattice structures, defined as architectured porous solids arranged in repeating patterns, are emerging as advanced sound‐absorbing materials. Their immense design freedom allows for customizable pore morphology and interconnectivity, enabling the design of specific absorption properties. Thus far, the sound absorption performance of various types of lattice structures are studied and they demonstrated favorable properties compared to conventional materials. Herein, this review gives a thorough overview on the current research status, and characterizations for lattice structures in terms of acoustics is proposed. Till date, there are four main sound absorption mechanisms associated with lattice structures. Despite their complexity, lattice structures can be accurately modelled using acoustical impedance models that focus on critical acoustical geometries. Four defining features: morphology, relative density, cell size, and number of cells, have significant influences on the acoustical geometries and hence sound wave dissipation within the lattice. Drawing upon their structural‐property relationships, a classification of lattice structures into three distinct types in terms of acoustics is proposed. It is proposed that future attentions can be placed on new design concepts, advanced materials selections, and multifunctionalities.

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Section: Finite Element Analysismentioning

confidence: 99%

3D‐Printed Lattice Structures for Sound Absorption: Current Progress, Mechanisms and Models, Structural‐Property Relationships, and Future Outlook

Li,

Chua,

et al. 2023

Advanced Science

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“…In addition to this, the consumption of sound wave energy is primarily caused by fibers' own vibrations, heat transfer and visco-thermal dissipation (red arrows). [34][35][36][37][38] The sound waves induce fiber vibrations in which part of sound energy is converted into mechanical energy. At the same time, as a consequence of vibration, there is friction between fibers and fibers, and between air molecules and fibers, where sound energy is transformed into thermal energy, generating heat transfer.…”

Section: Sound Insulation Of Hfgmentioning

confidence: 99%

Preparation and sound insulation of honeycomb composite structures filled with glass fiber

Ge,

Xue,

Liu

et al. 2023

Polymer Composites

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Honeycomb composite with excellent mechanical–physical properties had attracted extensive attention. To achieve outstanding sound insulation while maximizing the high‐performance of honeycomb composite, this article reported a honeycomb composite structure filled with glass fiber (HFG) based on a paper‐making process and the corresponding sandwich structure. Pulping parameters, mechanical property, air permeability and sound insulation of HFG were analyzed. The results showed that the hanging index and settling height of glass fiber slurry were inversely proportional to the beating degree, which was beneficial for reducing the coefficient of variation (CV) of HFG with value of 4%–6%. The maximum improvement in tensile strength and bursting strength of HFG were 70% and 53%, respectively. In addition, sound transmission loss (STL) of HFG was proportional to cell size, density, filling amount and thickness of the honeycomb. Compared to HFG, sandwich structure consisting of HFG and glass fiber/hot melt fiber panels effectively improved STL, especially at low‐mid frequencies. It was also found that designing holes on the surface of sandwich structure could further improve STL in certain frequency bands. The structure offered a lightweight and high‐performance response for construction, transportation and infrastructure.Highlights This article designs a new type of honeycomb filled glass fiber via paper‐making process, aiming to improve the comprehensive performance of honeycomb. By the design of embedded structure, the maximum improvement in tensile strength and bursting strength of honeycomb were 70% and 53%, respectively. By designing perforated, embedded and laminated structures, sound insulation has been improved, while reducing material quality.

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“…These typical properties or functions include the negative refractive index, − double-negative acoustic properties, negative Poisson’s ratio, − negative thermal expansion, − and so on. As an important foundation for engineering applications, additive manufacturing is a rapidly developing process that is widely used to fabricate metamaterials for mechanical, , electromagnetic, , superhydrophobic, flexible electronic, − acoustic, , and other applications. , …”

Section: Introductionmentioning

confidence: 99%

“…These typical properties or functions include the negative refractive index, 1−3 doublenegative acoustic properties, 4 negative Poisson's ratio, 5−9 negative thermal expansion, 10−13 and so on. As an important foundation for engineering applications, additive manufacturing is a rapidly developing process that is widely used to fabricate metamaterials for mechanical, 14,15 electromagnetic, 9,16 superhydrophobic, 17 flexible electronic, 18−20 acoustic, 21,22 and other applications. 23,24 This work focuses on a kind of metamaterial, which uniquely has the customizable coefficient of thermal expansion (CTE) and could offer advanced shape control ability under temperature variations.…”

Section: Introductionmentioning

confidence: 99%

Multimaterial Additively Manufactured Metamaterials Functionalized with Customizable Thermal Expansion in Multiple Directions

Xiao,

Chen,

Wang

et al. 2023

ACS Appl. Mater. Interfaces

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Metamaterials functionalized with customizable multidirectional coefficient of thermal expansion (CTE) are urgently needed for advanced shape control or dimensional stability under temperature variations. The currently reported metamaterials still lack the development of diverse base material systems and exploration of the multimaterial fabrication process. Especially, the reported range of customizable CTEs for metamaterials in multiple directions is limited within [−68.1, 56.4] ppm/°C. Here, this work explicitly proposes a strategy for closely linking base materials, additive manufacturing (AM) process, architecture, and CTE tunability, in order to provide a general guideline for the design or customization of such metamaterials. In detail, first, we systematically identify the key process parameters and related performance for additive manufacturing of polymers and propose various multimaterial systems such as polypropylene−polycarbonate (PP-PC). Then, six types of metamaterials have been fabricated with high quality by the established multimaterial additive manufacturing. By measuring the effective CTEs in multiple directions, the CTE tunability of metamaterials, including large positive values (+523.36 ppm/°C) and large negative values (−230.61 ppm/°C), far beyond the literature-reported CTE range, has been experimentally verified. Further, we have developed a bidirectional requirement−solution strategy here that acts as a bridge between design and fabrication. This work opens advanced avenues for metamaterials with multidirectionally customizable and extensive CTE tunability for a variety of engineering applications such as actuators, thermal stress relief, and improved structural stability.

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Harnessing cavity dissipation for enhanced sound absorption in Helmholtz resonance metamaterials

Abstract: Helmholtz resonance, based on resonance through a pore-and-cavity structure, constitutes the primary sound absorption mechanism in majority of sound-absorbing metamaterials. Typically, enhancing sound absorption in such absorbers necessitates substantial geometrical...

Cited by 14 publications

References 43 publications

3D‐Printed Lattice Structures for Sound Absorption: Current Progress, Mechanisms and Models, Structural‐Property Relationships, and Future Outlook

3D‐Printed Lattice Structures for Sound Absorption: Current Progress, Mechanisms and Models, Structural‐Property Relationships, and Future Outlook

Preparation and sound insulation of honeycomb composite structures filled with glass fiber

Multimaterial Additively Manufactured Metamaterials Functionalized with Customizable Thermal Expansion in Multiple Directions

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