Design of tunable acoustic metamaterials with periodic piezoelectric microstructure

Bacigalupo, Andrea; Bellis, Maria Laura De; Misseroni, D.

doi:10.1016/j.eml.2020.100977

Cited by 40 publications

(17 citation statements)

References 109 publications

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“…Some researchers have employed the piezoelectric shunt method [39][40][41][42] to manipulate the frequency range of the valley TPES and further realize reconfigurable TIs. Zhou et al [43] developed a tunable QVHE membrane-type metamaterial.…”

Section: Introductionmentioning

confidence: 99%

Valley Hall Elastic Edge States in Locally Resonant Metamaterials

et al. 2022

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This paper presents a locally resonant metamaterial periodically rearranged as a local resonator, that is hexagonal holes arranged in a thin plate replace the elastic local resonator to achieve the quantum valley Hall effect. Due to the C3v symmetry in the primitive hexagonal lattice, one Dirac point emerges at high symmetry points in the Brillouin zone in the sub-wavelength area. Rotating the beam element of the resonator can break the spatial inversion symmetry to lift the Dirac degeneracy and form a new bandgap. Thus, the band inversion is discovered by computing the relationship between the associated bandgap and the rotational parameter. We also confirmed this result by analyzing the vortex chirality and calculating the Chern number. We can discover two kinds of edge states in the projected band obtained by computing the supercell composed of different topological microstructures. Finally, the propagation behavior in various heterostructures at low frequencies was analyzed. It is shown that these valley Hall elastic insulators can guide elastic waves along sharp interfaces and are immune to backscattering from defects or disorder. By utilizing elastic resonators, a simple reconfigurable topological elastic metamaterial is realized in the sub-wavelength area.

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Section: Introductionmentioning

confidence: 99%

Valley Hall Elastic Edge States in Locally Resonant Metamaterials

et al. 2022

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“…Another novel proposal, building on the aforementioned active AMM research, employs a gyroscopic AMM cell to control the magnitude and direction of propagating acoustic waves [89]. Developing this technology further shows promise for the future construction of practical acoustic cloaks [90] and high-performance tuneable acoustic filters [91]. [87], with the permission of AIP Publishing).…”

Section: Active Metamaterialsmentioning

confidence: 99%

Additive Manufacture of Small-Scale Metamaterial Structures for Acoustic and Ultrasonic Applications

et al. 2021

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Acoustic metamaterials are large-scale materials with small-scale structures. These structures allow for unusual interaction with propagating sound and endow the large-scale material with exceptional acoustic properties not found in normal materials. However, their multi-scale nature means that the manufacture of these materials is not trivial, often requiring micron-scale resolution over centimetre length scales. In this review, we bring together a variety of acoustic metamaterial designs and separately discuss ways to create them using the latest trends in additive manufacturing. We highlight the advantages and disadvantages of different techniques that act as barriers towards the development of realisable acoustic metamaterials for practical audio and ultrasonic applications and speculate on potential future developments.

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“…the band-gap intervals) can be inferred from the dispersion diagram of the unit cell. The bandgap width can be tuned passively by acting on the geometry of the unit cell and on the materials constituting it [5][6][7], by introducing an elastic prestress [8,9], or actively by modifying these properties thanks to external solicitations in real time like in piezoelectric materials [10].…”

Section: Introductionmentioning

confidence: 99%

Metamaterial shields for inner protection and outer tuning through a relaxed micromorphic approach

Rizzi¹,

Neff²,

Madeo³

2022

Phil. Trans. R. Soc. A.

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In this paper, a coherent boundary value problem to model metamaterials' behaviour based on the relaxed micromorphic model is established. This boundary value problem includes well-posed boundary conditions, thus disclosing the possibility of exploring the scattering patterns of finite-size metamaterial specimens. Thanks to the simplified model’s structure (few frequency- and angle-independent parameters), we are able to unveil the scattering metamaterial’s response for a wide range of frequencies and angles of propagation of the incident wave. These results are an important stepping stone towards the conception of more complex large-scale meta-structures that can control elastic waves and recover energy. This article is part of the theme issue ‘Wave generation and transmission in multi-scale complex media and structured metamaterials (part 1)’.

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Design of tunable acoustic metamaterials with periodic piezoelectric microstructure

Cited by 40 publications

References 109 publications

Valley Hall Elastic Edge States in Locally Resonant Metamaterials

Valley Hall Elastic Edge States in Locally Resonant Metamaterials

Additive Manufacture of Small-Scale Metamaterial Structures for Acoustic and Ultrasonic Applications

Metamaterial shields for inner protection and outer tuning through a relaxed micromorphic approach

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