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<p>To enhance the low-frequency sound absorption performance of aluminum foam, a folded slit structure was introduced to achieve subwavelength sound absorption. The theoretical model and finite element model of sound absorption performance of folded slit aluminum foam structure are established. The influence of matrix material properties, number of folded slits, and geometric size on sound absorption performance is analyzed, and the reliability of the model is verified by experiments. It is found that the folded slit aluminum foam structure of the high flow resistance substrate material exhibits excellent subwavelength low-frequency sound absorption performance. At the peak frequency of sound absorption, the thickness of the material is only 1/15 of the wavelength, and the number of folded slits affects the frequency and bandwidth of the low-frequency sound absorption peak. Finally, the Nelder-Mead algorithm is used to optimize the geometric size. Compared with the unoptimized structure, the optimized sound absorption structure improves the low-frequency sound absorption performance by 13.4% and 9.8%, respectively. Hence, the work can guide for the design of the low-frequency sound absorption structure of aluminum foam.</p>

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Sound absorption mechanism and low frequency sound absorption performance optimization of aluminum foam-based labyrinth acoustic metamaterials

  • 期刊论文

  • 发表日期：

    2025年4月11日

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  • Jin Chen,
  • Lisi Liang,
  • Han Mi,
  • Jiangyu Qiao,
  • Zhongyi Cui,
  • Yi Li,
  • Lixing Zhang

摘要

To enhance the low-frequency sound absorption performance of aluminum foam, a folded slit structure was introduced to achieve subwavelength sound absorption. The theoretical model and finite element model of sound absorption performance of folded slit aluminum foam structure are established. The influence of matrix material properties, number of folded slits, and geometric size on sound absorption performance is analyzed, and the reliability of the model is verified by experiments. It is found that the folded slit aluminum foam structure of the high flow resistance substrate material exhibits excellent subwavelength low-frequency sound absorption performance. At the peak frequency of sound absorption, the thickness of the material is only 1/15 of the wavelength, and the number of folded slits affects the frequency and bandwidth of the low-frequency sound absorption peak. Finally, the Nelder-Mead algorithm is used to optimize the geometric size. Compared with the unoptimized structure, the optimized sound absorption structure improves the low-frequency sound absorption performance by 13.4% and 9.8%, respectively. Hence, the work can guide for the design of the low-frequency sound absorption structure of aluminum foam.