当前位置:
X-MOL 学术
›
Phys. Rev. Appl.
›
论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Ultrathin Composite Metasurface for Absorbing Subkilohertz Low-Frequency Underwater Sound
Physical Review Applied ( IF 4.6 ) Pub Date : 2021-07-08 , DOI: 10.1103/physrevapplied.16.014021 Ye Gu 1 , Houyou Long 1 , Ying Cheng 1, 2 , Mingxi Deng 3 , Xiaojun Liu 1, 2, 3
Physical Review Applied ( IF 4.6 ) Pub Date : 2021-07-08 , DOI: 10.1103/physrevapplied.16.014021 Ye Gu 1 , Houyou Long 1 , Ying Cheng 1, 2 , Mingxi Deng 3 , Xiaojun Liu 1, 2, 3
Affiliation
The crucial ability to suppress low-frequency waterborne sound efficiently has far-reaching implications for underwater noise-control engineering. Here, we propose an ultrathin composite metasurface in deep subwavelength thickness based on pentamode metamaterials (PMs) backed by rubber-metal resonators (RMRs). As a demonstration, average absorptance at subkilohertz frequencies ranging from 760 to 920 Hz (wavelength from 30.9 to 25.5 times of absorber thickness) is achieved. In the composite system, PM layer functions as an energy converter, which converts incident waterborne sound into mechanical vibrations, suggesting that sound waves could be absorbed only if the converted vibrations are eliminated by the backing RMRs. Beyond as a converter, PM itself also exhibits an additional stringlike resonant mode originating from the fixed-boundary constraints, which gives rise to intense vibrations of RMRs that facilitate energy dissipation. Further investigation demonstrates the unique property of robust high-efficiency absorption for extended frequency region and wide oblique incidence angles. The proposed methodology paves the way for a class of low-frequency underwater absorber design platforms, allowing devices for versatile applications to be envisioned.
中文翻译:
用于吸收亚千赫兹低频水声的超薄复合超表面
有效抑制低频水声的关键能力对水下噪声控制工程具有深远的影响。在这里,我们提出了一种基于由橡胶金属谐振器 (RMR) 支持的五模超材料 (PM) 的深亚波长厚度的超薄复合超表面。作为示范,平均吸收率 亚千赫兹频率范围从 760 到 920 Hz(波长 吸收器厚度的 30.9 到 25.5 倍)。在复合系统中,PM 层起到能量转换器的作用,将入射的水传播声转换为机械振动,这表明只有通过背衬 RMR 消除转换后的振动才能吸收声波。除了作为转换器之外,PM 本身还表现出源自固定边界约束的额外弦状谐振模式,这会引起 RMR 的强烈振动,从而促进能量耗散。进一步的研究证明了对扩展频率区域和宽斜入射角的强大高效吸收的独特属性。所提出的方法为一类低频水下吸收器设计平台铺平了道路,允许设想用于多功能应用的设备。
更新日期:2021-07-08
中文翻译:
用于吸收亚千赫兹低频水声的超薄复合超表面
有效抑制低频水声的关键能力对水下噪声控制工程具有深远的影响。在这里,我们提出了一种基于由橡胶金属谐振器 (RMR) 支持的五模超材料 (PM) 的深亚波长厚度的超薄复合超表面。作为示范,平均吸收率 亚千赫兹频率范围从 760 到 920 Hz(波长 吸收器厚度的 30.9 到 25.5 倍)。在复合系统中,PM 层起到能量转换器的作用,将入射的水传播声转换为机械振动,这表明只有通过背衬 RMR 消除转换后的振动才能吸收声波。除了作为转换器之外,PM 本身还表现出源自固定边界约束的额外弦状谐振模式,这会引起 RMR 的强烈振动,从而促进能量耗散。进一步的研究证明了对扩展频率区域和宽斜入射角的强大高效吸收的独特属性。所提出的方法为一类低频水下吸收器设计平台铺平了道路,允许设想用于多功能应用的设备。