Ventilated acoustic metasurface with low-frequency sound insulation

• DOI: 10.1121/10.0020133
• Publication Date: 2023-07-24T13:25:24Z
• Authors: Yingxin Zhang; Yao Wei Chin; Xiang Yu; Milan Shrestha; Gih-Keong Lau; Boo Cheong Koo; Kun Liu; Zhenbo Lu

A ventilated acoustic metasurface consisting of a membrane covered with a combination of different depth sub-chambers is proposed. It can achieve at least a 5 dB sound insulation acoustic performance in the wide frequency range from 100 to 1700 Hz, in particular a 10 dB noise reduction in the range from 100 to 200 Hz and from 437.4 to 1700 Hz, which can therefore cover the low-frequency range of the environmental noise. The physical mechanism of membrane-acoustic coupling for noise reduction in the low-frequency range is further explored.