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<p>Aircraft structural vibration and cabin noise critically impact comfort and equipment reliability. Traditional passive and active noise control methods face limitations in the low-frequency range, with issues of added mass or system complexity respectively. To address this issue, this study proposes a novel plate-type acoustic metamaterial unit cell based on the local resonance principle, ingeniously incorporating a compression-torsion coupling effect to generate broadband bandgap characteristics at extremely low frequencies. Using the finite element method with Bloch’s theorem, the structure is shown to exhibit a complete bandgap from 18.792 to 26.267&#xa0;Hz, yielding a bandwidth of 7.577&#xa0;Hz. Simulations confirm significant vibration attenuation and sound insulation within this range. A parametric study analyzed the influence of mass block size and linkage stiffness on bandgap properties. On this basis, a lightweight improvement plan was proposed to reduce the unit cell mass by approximately 24%. Experimental vibration transmission tests corroborated the simulation data, verifying the structure’s practical feasibility and effectiveness. This research provides a novel, lightweight metamaterial solution for low-frequency vibration and noise control in applications like aircraft cabins.</p>

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Performance of a Locally Resonant Metamaterial Plate for Low-Frequency Vibration and Noise Suppression

  • 期刊论文

  • 发表日期：

    2026年5月27日

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  • Lei Li,
  • Meng-Yao Zhang,
  • Yan-Liang Guo,
  • Ting-Ting Wang,
  • Kai Zhang,
  • Zi-Chen Deng

摘要

Aircraft structural vibration and cabin noise critically impact comfort and equipment reliability. Traditional passive and active noise control methods face limitations in the low-frequency range, with issues of added mass or system complexity respectively. To address this issue, this study proposes a novel plate-type acoustic metamaterial unit cell based on the local resonance principle, ingeniously incorporating a compression-torsion coupling effect to generate broadband bandgap characteristics at extremely low frequencies. Using the finite element method with Bloch’s theorem, the structure is shown to exhibit a complete bandgap from 18.792 to 26.267 Hz, yielding a bandwidth of 7.577 Hz. Simulations confirm significant vibration attenuation and sound insulation within this range. A parametric study analyzed the influence of mass block size and linkage stiffness on bandgap properties. On this basis, a lightweight improvement plan was proposed to reduce the unit cell mass by approximately 24%. Experimental vibration transmission tests corroborated the simulation data, verifying the structure’s practical feasibility and effectiveness. This research provides a novel, lightweight metamaterial solution for low-frequency vibration and noise control in applications like aircraft cabins.