US 12,254,858 B2
Acoustic metamaterial structure
Jong Jin Park, Sejong-si (KR); Jae Hwa Lee, Daejeon (KR); Eun Bok, Seoul (KR); and Hak Joo Lee, Daejeon (KR)
Assigned to CENTER FOR ADVANCED META-MATERIALS, Daejeon (KR)
Filed by CENTER FOR ADVANCED META-MATERIALS, Daejeon (KR)
Filed on Mar. 8, 2022, as Appl. No. 17/688,949.
Claims priority of application No. 10-2021-0031978 (KR), filed on Mar. 11, 2021.
Prior Publication US 2022/0293076 A1, Sep. 15, 2022
Int. Cl. G10K 11/162 (2006.01); G10K 11/16 (2006.01)
CPC G10K 11/162 (2013.01) [G10K 11/161 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An acoustic metamaterial structure comprising:
multiple first unit cells each comprising a first space having a first cross-sectional area and a second space disposed downstream of the first space in a flow direction of fluid to communicate with the first space, the second space having a second cross-sectional area larger than the first cross-sectional area,
wherein at least one of the multiple first unit cells communicates with a flow pipe through which the fluid flows,
the multiple first unit cells are sequentially arranged in a longitudinal direction of the flow pipe, and
the acoustic metamaterial structure reduces noise in a specific frequency range through formation of an acoustic bandgap, the specific frequency range being determined by a periodic structure formed by an array of the first space and the second space; and
a neck extension member extending from the first space to protrude inwardly of the second space,
wherein the first space has a shape bent at a 90-degree angle, with one end connected to the flow pipe and the other end connected to the second space.