4.8 Review

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

Journal

ADVANCED SCIENCE
Volume -, Issue -, Pages -

Publisher

WILEY
DOI: 10.1002/advs.202305232

Keywords

acoustics modelling; lattice structure; sound absorption; structural-property relationship; 3D printing

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Noise reduction through absorption is crucial for the well-being of humans and machines. Lattice structures, as advanced sound-absorbing materials, offer immense design freedom and customizable absorption properties. This review provides a comprehensive overview of the current research status and proposes a classification of lattice structures based on their acoustic properties. The acoustical geometries and sound wave dissipation within the lattice are influenced by morphology, relative density, cell size, and number of cells. The structural-property relationships of lattice structures are analyzed, and suggestions for future research directions are proposed.
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. Herein, the current progress, structural-property relationships, underlying mechanisms, and offer insights into the future prospects of lattice structures is critically reviewed for sound absorption. Notably, novel classifications for sound-absorbing lattices are being forwarded based on their structural characteristics and associated mechanisms. Building upon these, suggestions are put forth for future structural designs and propose innovative directions for further exploration.image

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