Abstract
The purpose of the research is to assess the sound absorption performance (SAP) of acoustic metamaterials made of double-layer Nomex honeycomb structures in which a micro-orifice corresponds to a honeycomb unit. For this purpose, the influences of structural parameters on the SAP of acoustic metamaterials were investigated by using experimental testing and a validated theoretical model. In addition, the sandwich structure was optimized by the genetic algorithm. The research shows that the panel thickness and micro-orifice diameter mainly affect the second resonant frequency and second peak sound absorption coefficient (SAC) of the structure. The unit cell size is found to influence the first and second resonant frequencies and two peaks of the SAC. An extremely low side-length of the honeycomb core decreases the SAP of the structure for low-frequency noise signals. Additionally, the sandwich structure presents a better SAP when the diameter of micro-orifices on the front micro-perforated panel (MPP) exceeds that of the back MPP. The sandwich structure shows better noise reduction performance after the optimization aiming at the noise frequency outside trains.
摘要
本文研究了每个蜂窝单元上都对应有微穿孔的双层Nomex蜂窝构成的声学超材料的吸声性能. 基于传递矩阵法构建理论模型并进行试验测试和验证, 研究结构参数对其吸声性能的影响, 并基于遗 传算法优化了夹层板结构. 研究结果表明, 面板厚度和孔径主要影响结构第二个共振频率和吸声峰值 的大小, 胞元大小影响第一、 第二共振频率和峰值的大小, 过小的蜂窝芯边长会降低结构对低频的吸 声性能. 同时发现前板孔径大于后板孔径时, 结构表现出更好的吸声性能. 对列车车外噪声频率进行 优化后, 结构具有更好的降噪性能.
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Project(51775558) supported by the National Natural Science Foundation of China; Project(2019JJ30034) supported by the Natural Science Foundation for Excellent Youth Scholars of Hunan Province, China; Project(20181053303gg) supported by the Training Objects of Young-Middle-Aged Backbone Teacher in Ordinary Universities of Hunan Province, China
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WANG Da wrote the original draft, XIE Su-chao helped perform the analysis with constructive discussions, YANG Shi-chen and LI Zhen contributed significantly to manuscript preparation.
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WANG Da, XIE Su-chao, YANG Shi-chen, and LI Zhen declare that they have no conflict of interest.
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Wang, D., Xie, Sc., Yang, Sc. et al. Sound absorption performance of acoustic metamaterials composed of double-layer honeycomb structure. J. Cent. South Univ. 28, 2947–2960 (2021). https://doi.org/10.1007/s11771-021-4818-3
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DOI: https://doi.org/10.1007/s11771-021-4818-3