The development of sound-absorbing materials for noise reduction in daily life has been a prolonged issue that also applies to a recognized need for submarine anechoic tiles to stay independent from SONAR (SOund NAvigation Ranging). Here, we present an underwater stealth metasurface that uses split-orifice–conduit (SOC) hybrid resonators to significantly reduce its acoustic reflectance. A theoretical analysis of SOC elements provides an approach to quantifying acoustic characteristics using the transfer matrix method in a single metasurface. The findings confirm that we can tune the absorption with respect to a resonating frequency by adjusting geometrical parameters. Utilizing a hybrid mechanism that enables easy access to coupled resonances, we obtain broadband absorption spectra even in the presence of a covariant sound speed profile in the deep sea and a thermoviscous effect on unit cells of the metasurface. Such a metasurface will provide a further step toward developing feasible underwater stealth technologies for submarines and remains to be experimentally demonstrated.
Underwater stealth metasurfaces composed of split-orifice–conduit hybrid resonators
Note: This paper is part of the Special Topic on Acoustic Metamaterials 2021.
Dongwoo Lee, Yeongtae Jang, Jeonghoon Park, In Seok Kang, Jensen Li, Junsuk Rho; Underwater stealth metasurfaces composed of split-orifice–conduit hybrid resonators. J. Appl. Phys. 14 March 2021; 129 (10): 105103. https://doi.org/10.1063/5.0042246
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