6533b85dfe1ef96bd12be019
RESEARCH PRODUCT
Enhancing the sound absorption of small-scale 3D printed acoustic metamaterials based on Helmholtz resonators
Cecilia CasariniCharles MacleodJoseph C. JacksonJames F. C. WindmillBenjamin TillerCarmelo Mineosubject
0209 industrial biotechnologyAbsorption (acoustics)AcousticsTKPhysics::Optics02 engineering and technology01 natural scienceslaw.inventionResonatorsymbols.namesake020901 industrial engineering & automationlawElectrical and Electronic EngineeringInstrumentationStereolithographyPhysicsAttenuation010401 analytical chemistryMetamaterial0104 chemical sciencesComputer Science::SoundHelmholtz free energy3D printing Acoustic metamaterials Helmholtz resonators membranes overtones sound absorption stop bandssymbolsLoudspeakerAcoustic attenuationdescription
Acoustic metamaterials have recently become of interest for their ability to attenuate sound by breaking the mass-density 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 small scale. The proposed metamaterials are subwavelength at a factor of $\lambda /12$ 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 3-D 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2018-10-01 |