Zhang Yingxin, Chin Yao Wei, Yu Xiang, Shrestha Milan, Lau Gih-Keong, Koo Boo Cheong, Liu Kun, Lu Zhenbo
School of Aeronautics and Astronautics, Shenzhen Campus of Sun Yat-sen University, Shenzhen 518107, China.
Department of Mechanical Engineering, National University of Singapore, Singapore 117411, Singapore.
JASA Express Lett. 2023 Jul 1;3(7). doi: 10.1121/10.0020133.
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.
