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<p>Acoustic metamaterials (AMs) exhibit outstanding sound absorption performance due to their customizable design. In this work, a low-frequency sound-absorbing metamaterial plate, which combines a fractal-based labyrinth acoustic metamaterial (FLAM) and a micro-perforation panel, is proposed. The theoretical, simulation, and experimental methods are used to comprehensively examine the sound absorption performance. A triangular fractal curve is first introduced, and the combined FLAM model is constructed. An equivalent straight channel model is developed to study the effects of the structural parameters on the sound absorption coefficients. The finite element analysis (FEA) is further conducted to validate the theoretical results. All the findings indicate that the proposed combined FLAM exhibits excellent sound absorption performance at a deep sub-wavelength scale, with absorption coefficients of 0.89, 0.98, and 1.00 for the first three fractal orders, respectively. Finally, the prototypes are fabricated, and the impedance tube experiments are conducted, yielding results that align closely with both analytical and FEA results. Notably, the sound absorption performance of large-area sound-absorbing plates is also investigated by splicing two/four FLAMs together, demonstrating a relative absorption bandwidth exceeding 35%. This work offers a viable alternative to low-frequency sound-absorbing materials for potential engineering applications.</p>

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Fractal-Based Acoustic Metamaterials Coupling with Micro-Perforation for Low-Frequency Sound Absorption

  • 期刊论文

  • 发表日期：

    2025年7月3日

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  • Dongxing Cao,
  • Liming Wang,
  • Junru Wang,
  • Jianfei Wang,
  • Xiangying Guo,
  • Shuai Huang

摘要

Acoustic metamaterials (AMs) exhibit outstanding sound absorption performance due to their customizable design. In this work, a low-frequency sound-absorbing metamaterial plate, which combines a fractal-based labyrinth acoustic metamaterial (FLAM) and a micro-perforation panel, is proposed. The theoretical, simulation, and experimental methods are used to comprehensively examine the sound absorption performance. A triangular fractal curve is first introduced, and the combined FLAM model is constructed. An equivalent straight channel model is developed to study the effects of the structural parameters on the sound absorption coefficients. The finite element analysis (FEA) is further conducted to validate the theoretical results. All the findings indicate that the proposed combined FLAM exhibits excellent sound absorption performance at a deep sub-wavelength scale, with absorption coefficients of 0.89, 0.98, and 1.00 for the first three fractal orders, respectively. Finally, the prototypes are fabricated, and the impedance tube experiments are conducted, yielding results that align closely with both analytical and FEA results. Notably, the sound absorption performance of large-area sound-absorbing plates is also investigated by splicing two/four FLAMs together, demonstrating a relative absorption bandwidth exceeding 35%. This work offers a viable alternative to low-frequency sound-absorbing materials for potential engineering applications.