Multi-resonator metamaterials as multi-band metastructures

Gorshkov, Vyacheslav, Sareh, Pooya ORCID: 0000-0003-1836-2598, Navadeh, Navid, Tereshchuk, Vladimir and Fallah, Arash S (2021) Multi-resonator metamaterials as multi-band metastructures. MATERIALS & DESIGN, 202. p. 109522.

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Official URL: http://dx.doi.org/10.1016/j.matdes.2021.109522

Abstract

Introducing multi-resonator microstructure into phononic metamaterials provides more flexibility in bandgap manipulation. In this work, 3D-acoustic metamaterials of the body- and face-centered cubic lattice systems encompassing nodal isotropic multivibrators are investigated. Our main results are: (1) the number of bandgaps equals the number, n, of internal masses as each bandgap is a result of the classical analog of the quantum level-repulsion mechanism between internal and external oscillations, and (2) the upper boundary frequencies, ωupper2i, i = 1, 2, ⋯, n, of the gaps formed coincide with eigen-frequencies, ωint;i2 ≠ 0, of the isolated multivibrator, ωupper2;i = ωint; i2, and the lower boundary frequencies, ωlower2,i2, are in good agreement with estimations as ωlower,i2≈ω^int;i2 (ωlower,i2<ω^int;i2), where ω^int;i2 represent the eigen-frequencies of the multivibrator when its external shell is motionless. The morphologies of the set of dispersion surfaces, ωm2(k), m = 1, 2, …, 6, in the corresponding passbands are similar to each other and to that of the set of dispersion surfaces, ωext; m2(k), obtained through the exclusion of internal masses. Thus, the problem of analyzing the acoustic properties of the complicated system is reduced to the study of two simple sets {ωint; i2} and ω^int;i2, along with {ωext; m2(k)}, the morphology of which depends only on the type of lattice symmetry. This splitting renders controlled phononic bandgaps formation in homogeneous multi-resonator metamaterials feasible.

Item Type:	Article
Uncontrolled Keywords:	Multi-resonator, Phononic metamaterial, Acoustic mode, Optic mode, Bandgap, Dispersion surface
Depositing User:	Symplectic Admin
Date Deposited:	01 Feb 2021 15:52
Last Modified:	18 Jan 2023 23:01
DOI:	10.1016/j.matdes.2021.109522
Open Access URL:	https://www.sciencedirect.com/science/article/pii/...
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3115058