Enhancing the sound absorption of small-scale 3D printed acoustic metamaterials based on Helmholtz resonators

Cecilia Casarini, Ben Tiller, Carmelo Mineo, Charles N. MacLeod, James F. C. Windmill, Joseph C. Jackson

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)
258 Downloads (Pure)


Acoustic metamaterials have recently become of interest for their ability to attenuate sound by breaking the massdensity law. In this paper, acoustic metamaterials based on Helmholtz resonators and capable of attenuating sound up to 30 dB are fabricated for sound absorption applications in the smallscale. The proposed metamaterials are subwavelength at a factor of λ/12 with respect to the lateral dimension of the units. The directional response due to the position of the acoustic source on the sound attenuation provided by the metamaterial is investigated by controlling the location of a loudspeaker with a robot arm. To enhance and broaden the absorption bands, structural modifications are added such that overtones are tuned to selected frequencies, and membranes are included at the base of the resonators. This design is made possible by innovative 3D printing techniques based on stereolithography and on the use of specific UV-curable resins. These results show that these designs could be used for sound control in small-scale electroacoustic devices and sensors.
Original languageEnglish
Pages (from-to)7949-7955
Number of pages7
JournalIEEE Sensors Journal
Issue number19
Early online date13 Aug 2018
Publication statusPublished - 1 Oct 2018


  • acoustic metamaterials
  • Helmholtz resonators
  • overtones
  • membranes
  • sound absorption
  • stop bands
  • 3D printing


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