Abstract
In the past two decades, acoustic metamaterials have garnered much attention owing to their unique functional characteristics, which are difficult to find in naturally available materials. The acoustic metamaterials have demonstrated excellent acoustical characteristics that paved a new pathway for researchers to develop effective solutions for a wide variety of multifunctional applications, such as low-frequency sound attenuation, sound wave manipulation, energy harvesting, acoustic focusing, acoustic cloaking, biomedical acoustics, and topological acoustics. This review provides an update on the acoustic metamaterials’ recent progress for simultaneous sound attenuation and air ventilation performances. Several variants of acoustic metamaterials, such as locally resonant structures, space-coiling, holey and labyrinthine metamaterials, and Fano resonant materials, are discussed briefly. Finally, the current challenges and future outlook in this emerging field are discussed as well.
Highlights
In the past two decades, acoustic metamaterials have garnered much attention owing to their unique functional characteristics, which are difficult to find in naturally available materials
Melnikov et al [102] demonstrated meta-capsule design of prototype used to investigate the acoustical performance of the The stagethreemachine the capabilities acoustic was metamaterials for the reduction of stage machinery noise
The acoustic meta-absorber is a special kind of acoustic metamaterial capable of providing high
Summary
The concept of metamaterial research initially originates from electromagnetics, which is based upon the fundamental Maxwell’s equations. The effective mass density and bulk modulus behaviors are associated with two distinct spatial symmetries of the particular resonances, and by overlapping the frequency-dependent response of these two symmetries, it is possible to realize double negativity. The design of these metamaterials usually involves the hybridization of two different kinds of subwavelength resonators [46,47,48,49]. Recent Applications of Acoustic Metamaterials for Sound Attenuation and Ventilation
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