Acoustic metamaterials with controllable bandgap gates based on magnetorheological elastomers

Gorshkov, Vyacheslav N, Bereznykov, Oleksii V, Boiger, Gernot K, Sareh, Pooya ORCID: 0000-0003-1836-2598 and Fallah, Arash S (2023) Acoustic metamaterials with controllable bandgap gates based on magnetorheological elastomers. INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES, 238. p. 107829.

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Official URL: http://dx.doi.org/10.1016/j.ijmecsci.2022.107829

Abstract

Acoustic metamaterials allow for creating selective pass- and stop-bands on the frequency spectrum. We demonstrate the possibility of designing acoustic metamaterials as core-shell 2D-phononic media with an extremely simple morphology, the frequency spectrum of which contains many real-time tunable bandgaps. The connected shells of such metamaterials form a grid with square cells filled with nuclei partitionable into two subsystems. Both subsystems are characterized by their frequency spectra, and it is the coupling between them that generates the bandgaps. If the structural elements of the metamaterial are built based on magnetoelastomers, then bandgaps can be easily controlled by an external magnetic field that changes the elastic moduli of shells/cores. We have shown the possibility of manipulating single bandgaps in different parts of the spectrum, and simultaneous control of all bandgaps up to their complete disappearance. This manipulation can be carried out, specifically, with no change in the maximum achievable frequency in the metamaterial. The results obtained can be used for selective filtering of damaging wave components, active control of seismic or blast waves, sonar systems, ultrasound imaging, impact-resistant structures, and noise cancelation protocols. The physical concepts developed are extendable to 3D-structures in a similar fashion so can benefit a wider community.

Item Type:	Article
Uncontrolled Keywords:	Acoustic metamaterials, Active filtering, bands, Controlling pass -, Core -shell structures, Magnetoelastomers, stop
Divisions:	Faculty of Science and Engineering > School of Engineering
Depositing User:	Symplectic Admin
Date Deposited:	16 Jan 2023 10:39
Last Modified:	16 Jan 2023 11:18
DOI:	10.1016/j.ijmecsci.2022.107829
Open Access URL:	https://reader.elsevier.com/reader/sd/pii/S0020740...
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3167055