| 粱梦桃,吴华根,熊艳玲,付泽明.二维局域共振型声子晶体吸声特性*[J].,2025,44(4):971-982 |
| 二维局域共振型声子晶体吸声特性* |
| Sound absorption characteristics of two-dimensional locally resonant sonic crystal |
| 投稿时间：2024-12-19 修订日期：2025-06-25 |
| 中文摘要: |
| 针对传统吸声材料低频吸声性能差，难以满足全方位全频段噪声吸收的问题，提出了由排列在六边形晶格中的圆柱形散射体组成的二维局域共振型声子晶体。通过比较不同入射角度下二维声子晶体的理论吸声系数和有限元结果证实了理论吸声模型的可靠性。结果表明：垂直入射时该声子晶体在410 Hz处出现了吸声系数为0.99的近完美一阶吸声峰，半吸声带宽为165 Hz；在1840 Hz处出现了二阶完美吸声峰，半吸声带宽为295 Hz。声子晶体的共振峰和半吸声带宽会随着声波入射角度的变化而显著改变。增加散射体中心距可以在保持高吸声峰值的同时使共振频率向低频移动。此外，提高填充分数也可使共振频率向低频移动。通过散射体层数和结构总层数的调整可以得到优异的吸声性能。研究工作可为新型全向宽带吸声器的研发与应用提供指导。 |
| 英文摘要: |
| A two-dimensional locally resonant sonic crystal composed of cylindrical scatterers arranged in hexagonal lattice is proposed to address the problem of poor low-frequency sound absorption performance of traditional sound-absorbing materials, which are difficult to meet the requirements of noise absorption in all directions and frequency bands. The reliability of the theoretical absorption model of two-dimensional sonic crystals are confirmed by comparing the theoretical absorption coefficients with the finite element results at different incidence angles. The results show that under the condition of normal incidence, the sonic crystal exhibits a near-perfect first-order absorption peak with an absorption coefficient of 0.99 at 410 Hz and a half -absorption bandwidth of 165 Hz, and a second-order perfect absorption peak at 1840 Hz with a half-absorption bandwidth of 295 Hz. The resonance peak and the semi-absorption bandwidth of the sonic crystal change significantly with the variation of the incidence angle of acoustic wave. Increasing the center distance and the total layers of the structure can move the resonance frequency to the lower frequency while maintaining the high absorption peak. In addition, increasing the filling fraction can also make the resonance frequency shift to the low frequency. Excellent sound absorption performance can be achieved by adjusting the number of scattering layers and structural layers. The research work can provide guidance for the development and application of novel omnidirectional broadband absorbers. |
| DOI：10.11684/j.issn.1000-310X.2025.04.018 |
| 中文关键词: 声子晶体 全向宽带吸声 局域共振 低频吸声 |
| 英文关键词: sonic crystal omnidirectional broadband absorption locally resonance low-frequency sound absorption |
| 基金项目:国家杰出青年科学基金 |
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