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<p>In order to address the issue of the bulky nature of acoustic materials, multi-band acoustic metamaterials (AMs) with negative effective mass density have been designed using nested multilayer open-end-closed-end OE-CE hollow tubes (NMLHT). The number of layers determines the number of frequency bands of the negative effective mass density, as demonstrated by experiments and simulations. The resonance frequency is found to be strongly correlated to the length of the tubes, the resonant frequency can be modified by adjusting the height of the inner water medium, while there is only a weak correlation with the centrifugal distance. Based on the one-dimensional approximate wave principle, an exact resonant frequency formula for NMLHT is derived, which is highly consistent with the simulation. This formula can be reversed to accurately set the structural geometric parameters to match the target response band. This multi-band intensifier improves space utilization, enhances design flexibility, simplifies modelling and facilitates customized production. Furthermore, it is straightforward to combine with other negative modulus units to conveniently develop dual-negative AMs in the desired frequency band.</p>

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Multiband and broadband acoustic metamaterials from nested multilayer hollow tubes

  • 期刊论文

  • 发表日期：

    2025年6月30日

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  • Limei Hao,
  • Dong-an Liu,
  • Xiao Yang,
  • Xiaole Yan,
  • Jifeng Guo,
  • Qingning Yang,
  • Xingchen Tian,
  • Shaofang Pang,
  • You Xie,
  • Zhi Chen

摘要

In order to address the issue of the bulky nature of acoustic materials, multi-band acoustic metamaterials (AMs) with negative effective mass density have been designed using nested multilayer open-end-closed-end OE-CE hollow tubes (NMLHT). The number of layers determines the number of frequency bands of the negative effective mass density, as demonstrated by experiments and simulations. The resonance frequency is found to be strongly correlated to the length of the tubes, the resonant frequency can be modified by adjusting the height of the inner water medium, while there is only a weak correlation with the centrifugal distance. Based on the one-dimensional approximate wave principle, an exact resonant frequency formula for NMLHT is derived, which is highly consistent with the simulation. This formula can be reversed to accurately set the structural geometric parameters to match the target response band. This multi-band intensifier improves space utilization, enhances design flexibility, simplifies modelling and facilitates customized production. Furthermore, it is straightforward to combine with other negative modulus units to conveniently develop dual-negative AMs in the desired frequency band.