Akademik Veri Yönetim Sistemi
4th International Naval Architecture and Maritime Symposium (Int-Nam 2023), İstanbul, Türkiye, 11 - 13 Ekim 2023, cilt.1, sa.1, ss.1-9
Acoustic ventilation metamaterials surpass the limitations of conventional sound barriers and go beyond the accepted traditional applications, by simultaneously sound blocking and allowing free airflow. This presents significant potential for specific scenarios in acoustic engineering. Here, we propose multiorder acoustic ventilation metamaterials with different numbers of layers, which can achieve diverse insulation peaks in the low and high-frequency regions. The metastructure is typically composed of a hollow circular cylinder with a diverse number of resonant chambers connected to the cylinder via orifices. The single-layer metamaterial with a thickness of 6.5 mm provides a bandwidth of 1301 Hz at a transmission loss of 10 dB. As we increase the number of layers to three, five, and seven, the bandwidth improves to 1867 Hz, 2384 Hz, and 2904 Hz, respectively. Our proposal can offer enhanced soundproofing performance with varying thicknesses whilst maintaining a free airflow passage. This makes it suitable for challenging environments that require both noise reduction and air circulation.