A new membrane-type metamaterial for multiple peaks absorption at low frequencies

F. Bucciarelli, O. Iervolino, M. Meo

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In the recent years, various membrane-type acoustic metamaterials were developed for low frequency sound absorption. However, a membrane absorber usually requires a large back cavity to achieve low frequency sound absorption and on the other hand, in order to guaranty a multiple peaks absorption decorated membrane resonators or membrane with multiple magnetic negative stiffness cell shall be considered. This research proposes a new concept of membrane-type metamaterial which can achieve multiple peaks and broadband absorption at low frequencies. The basic concept behind the design of the elementary cell is associated to the vibro-acoustic behavior of the structure. In fact, the maximum sound absorption is related to the symmetrical mode of the membrane, so playing with the geometry, the mass and the stiffness of the membrane the eigenfrequencies can be tuned easily in the prescribed frequency range. At same time local increase of strain energy around geometrical discontinuity or around discontinuity associated to the material properties may lead a gain in sound absorption. A mono-layer membrane structure is presented where the geometrical shape and material properties distribution in terms of density and stiffness in the elementary cell are optimized in order to manipulate the vibro-acoustic properties and maximize the absorption at required frequencies. To optimize the geometry and the vibro-acoustic properties of the proposed metamaterial, finite element simulation were carried out. The numerical model was then validated using experimental measurements. A preliminary prototype was tested into an impedance tube test ring and the normal sound absorption was measured following the transfer function approach and compared with the numerical results.

Original languageEnglish
Title of host publicationHealth Monitoring of Structural and Biological Systems XII
PublisherSPIE
ISBN (Electronic)9781510616967
DOIs
Publication statusPublished - 1 Jan 2018
EventHealth Monitoring of Structural and Biological Systems XII 2018 - Denver, USA United States
Duration: 5 Mar 20188 Mar 2018

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume10600

Conference

ConferenceHealth Monitoring of Structural and Biological Systems XII 2018
CountryUSA United States
CityDenver
Period5/03/188/03/18

Fingerprint

Metamaterials
Low Frequency
sound transmission
Absorption
Membrane
membranes
low frequencies
Membranes
Acoustic waves
Acoustics
Acoustic properties
stiffness
acoustic properties
Stiffness
Materials properties
discontinuity
Material Properties
cells
Discontinuity
Cell

Keywords

  • impedance tube
  • membrane-type acoustic metamaterials
  • transfer function method

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Bucciarelli, F., Iervolino, O., & Meo, M. (2018). A new membrane-type metamaterial for multiple peaks absorption at low frequencies. In Health Monitoring of Structural and Biological Systems XII [1060011] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 10600). SPIE. https://doi.org/10.1117/12.2297670

A new membrane-type metamaterial for multiple peaks absorption at low frequencies. / Bucciarelli, F.; Iervolino, O.; Meo, M.

Health Monitoring of Structural and Biological Systems XII. SPIE, 2018. 1060011 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 10600).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Bucciarelli, F, Iervolino, O & Meo, M 2018, A new membrane-type metamaterial for multiple peaks absorption at low frequencies. in Health Monitoring of Structural and Biological Systems XII., 1060011, Proceedings of SPIE - The International Society for Optical Engineering, vol. 10600, SPIE, Health Monitoring of Structural and Biological Systems XII 2018, Denver, USA United States, 5/03/18. https://doi.org/10.1117/12.2297670
Bucciarelli F, Iervolino O, Meo M. A new membrane-type metamaterial for multiple peaks absorption at low frequencies. In Health Monitoring of Structural and Biological Systems XII. SPIE. 2018. 1060011. (Proceedings of SPIE - The International Society for Optical Engineering). https://doi.org/10.1117/12.2297670
Bucciarelli, F. ; Iervolino, O. ; Meo, M. / A new membrane-type metamaterial for multiple peaks absorption at low frequencies. Health Monitoring of Structural and Biological Systems XII. SPIE, 2018. (Proceedings of SPIE - The International Society for Optical Engineering).
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