Novel resonator geometry for easily manufactured tunable locally resonant metamaterial

Nerse, C; Schadeberg, R; Oberst, S

Novel resonator geometry for easily manufactured tunable locally resonant metamaterial

Nerse, C

Schadeberg, R Oberst, S

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Publisher:: AAS
Publication Type:: Conference Proceeding
Citation:: Annual Conference of the Australian Acoustical Society 2021: Making Waves, AAS 2021, 2022, pp. 68-72
Issue Date:: 2022-01-01

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Field	Value	Language
dc.contributor.author	Nerse, C https://orcid.org/0000-0003-4003-6262
dc.contributor.author	Schadeberg, R
dc.contributor.author	Oberst, S https://orcid.org/0000-0002-1388-2749
dc.date	2021-02-21
dc.date.accessioned	2022-09-20T06:22:28Z
dc.date.available	2022-09-20T06:22:28Z
dc.date.issued	2022-01-01
dc.identifier.citation	Annual Conference of the Australian Acoustical Society 2021: Making Waves, AAS 2021, 2022, pp. 68-72
dc.identifier.isbn	9781713844266
dc.identifier.uri	http://hdl.handle.net/10453/161919
dc.description.abstract	Mechanical waves and sound waves have complex propagation characteristics that are manipulated by periodic structures such as elastic metamaterials and phononic crystals for the purposes of wave guiding, vibration isolation and sound absorption. System parameters are tuned to induce auxetic physical properties such as negative effective mass density and negative Poisson's ratio. Locally resonant metamaterial (LRM) uses Fano-type interference to manipulate elastic wave propagation from the host structure by formation of a band gap due to local resonance. Not restricted by the Bragg interference limit, such sub-wavelength structures are particularly effective in attenuation of the low frequency oscillations. Tunability of the lower and upper bounds of the band gap through simple geometrical and material variations has made the LRMs a strong candidate for the noise and vibration control of automotive and industrial applications. In this study, we demonstrate a tunable LRM design that can be fabricated by injection moulding and vacuum casting. The mould for the fabrication of the resonator features a cylindrical hollow section. Pins of different diameter can be inserted into the mould to vary the material distribution in the cavity, thereby changing the resonance. A numerical model using COMSOL Multiphysics has been developed to investigate the dispersion mechanism. A parametric study of the pin diameter with respect to target band gap frequency demonstrates the capability of broadband vibration attenuation while keeping the overall size of the resonator small and constant. These results are promising for practical implementation of LRMs.
dc.language	en
dc.publisher	AAS
dc.relation	http://purl.org/au-research/grants/arc/DP200101708
dc.relation.ispartof	Annual Conference of the Australian Acoustical Society 2021: Making Waves, AAS 2021
dc.relation.ispartof	Annual Conference of the Australian Acoustical Society
dc.rights	info:eu-repo/semantics/openAccess
dc.title	Novel resonator geometry for easily manufactured tunable locally resonant metamaterial
dc.type	Conference Proceeding
utslib.location.activity	Wollongong, Australia
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Mechanical and Mechatronic Engineering
utslib.copyright.status	open_access	*
pubs.consider-herdc	false
dc.date.updated	2022-09-20T06:22:27Z
pubs.finish-date	2021-02-23
pubs.place-of-publication	Australia
pubs.publication-status	Published
pubs.start-date	2021-02-21
dc.location	Australia

Abstract:

Mechanical waves and sound waves have complex propagation characteristics that are manipulated by periodic structures such as elastic metamaterials and phononic crystals for the purposes of wave guiding, vibration isolation and sound absorption. System parameters are tuned to induce auxetic physical properties such as negative effective mass density and negative Poisson's ratio. Locally resonant metamaterial (LRM) uses Fano-type interference to manipulate elastic wave propagation from the host structure by formation of a band gap due to local resonance. Not restricted by the Bragg interference limit, such sub-wavelength structures are particularly effective in attenuation of the low frequency oscillations. Tunability of the lower and upper bounds of the band gap through simple geometrical and material variations has made the LRMs a strong candidate for the noise and vibration control of automotive and industrial applications. In this study, we demonstrate a tunable LRM design that can be fabricated by injection moulding and vacuum casting. The mould for the fabrication of the resonator features a cylindrical hollow section. Pins of different diameter can be inserted into the mould to vary the material distribution in the cavity, thereby changing the resonance. A numerical model using COMSOL Multiphysics has been developed to investigate the dispersion mechanism. A parametric study of the pin diameter with respect to target band gap frequency demonstrates the capability of broadband vibration attenuation while keeping the overall size of the resonator small and constant. These results are promising for practical implementation of LRMs.

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http://hdl.handle.net/10453/161919