Journal
PHYSICA SCRIPTA
Volume 97, Issue 8, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1402-4896/ac8026
Keywords
metasurface; sound absorption; helmholtz resonator; embedded neck
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Funding
- Ministry of Science and Technology, Taiwan [MOST1092221-E-006-010-MY3]
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This study presents a novel acoustic metasurface with a coplanar series-type Helmholtz resonator with curled necks, which reduces the resonance frequency. The sound absorption performance of this metasurface is investigated theoretically, numerically, and experimentally, demonstrating its effectiveness in absorbing low-frequency sound.
This study presents a novel acoustic metasurface with a coplanar series-type Helmholtz resonator with curled necks. Using extended necks that are embedded in cavities enables one to significantly reduce the resonance frequency of the resonator. The sound absorption performance of this metasurface is investigated theoretically, numerically, and experimentally. The absorption band can be easily adjusted by altering the neck length and diameter. To achieve a wide frequency band with high absorption, two inhomogeneous units are arranged in parallel. Theoretical and finite-element predictions exhibit good agreement with the experimental measurements. The results demonstrate that the proposed acoustic metasurface with subwavelength thickness is capable of effectively absorbing low-frequency sound.
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