Abstract
Acoustic metamaterials achieve the function of absorbing sound through equivalent negative parameters and bandgaps. Sound absorption is closely related to structural design. How to effectively control acoustic metamaterials’ acoustic performance through structural design is of vital importance. This paper summarizes the structural design of typical acoustic metamaterials of the membrane, plates, Helmholtz cavities, and coupling structures from the structural design perspective. Acoustic metamaterials of different structures have their suitable application scenarios. Here, we review the latest progress of acoustic metamaterials in which various structures were applied to broaden the bandgap. Furthermore, this review may provide guidance for the potential application of acoustic metamaterials in engineering practice.
Highlights
Attempting to influence the propagation of sound waves by using materials is a critical study
This review describes the structural design of typical membrane, plate, cavity, and complex structure based acoustic metamaterials (AMMs)
Typical acoustic metamaterial structures can be classified into membrane, plates, Helmholtz cavities, and coupling structures
Summary
Attempting to influence the propagation of sound waves by using materials is a critical study. They prepared a cubic lattice structure of lead balls wrapped in viscoelastic silicone rubber and found that the structure has a particular bandgap This phononic crystal structure based on local resonance can effectively break through the technical bottleneck of low-frequency vibration and noise absorption. They can control large-wavelength and low-frequency mechanical waves through sub-wavelength microstructures.. Liu et al. mainly introduced the equivalent acoustic parameters and extraordinary characteristics of metamaterials, and the review by Kumar primarily presented their potential applications and production challenges. They did not optimize the performance of AMMs based on structural design. The creation of AMMs based on controllable structures is essential to optimize their performance
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