嵌套开缝共振腔型声学超材料性能及测试分析  

Performance and test analysis of acoustic metamaterials with nested slit resonant cavity

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作  者:张宪旭 李丽君[1] 魏逸飞 张帆[1] 安留学 ZHANG Xian-xu;LI Li-jun;WEI Yi-fei;ZHANG Fan;AN Liu-xue(School of Transportation and Vehicle Engineering,Shandong University of Technology,Zibo 255049)

机构地区:[1]山东理工大学交通与车辆工程学院,山东淄博255049

出  处:《机械设计》2023年第1期40-46,共7页Journal of Machine Design

基  金:山东省自然科学基金(ZR2020ME123);国家自然科学基金(51505261)。

摘  要:设计了一种嵌套开缝共振腔型声学超材料,由两个大小不同的开缝内腔嵌套并周期排列构成,其内部波导、开缝结构、腔体和外部波导提供了多个共振区域,实现了对中低频噪声的控制。通过COMSOL Multiphysics计算了声学超材料能带结构图与传递损失曲线,传递损失曲线峰值频域与能带结构图的带隙频域相吻合,在2 000 Hz以下频率范围内,结构存在2条完全带隙和4条方向带隙。对所设计结构的带隙产生机理进行分析:带隙下边界形成机理为单元腔体独立共振,上边界形成机理为腔体与外部波导的联合共振。搭建阻抗管测试系统,测试样件吸声系数大于0.6的效吸声范围为800~1 600 Hz,吸声效果要好于传统吸声材料三聚氰胺泡沫,且试验测试数据与仿真计算传递损失结果较为吻合。In this article, the acoustic metamaterials with nested slit resonant cavity are designed, which consist of two slit resonant cavities of different sizes nested and arranged periodically. The inner waveguide, slit structure, cavity and outer waveguide provide multiple resonant regions and realize control of low-and-medium frequency noise. Through COMSOL Multiphysics, the energy-band structure diagram and the transfer-loss curve of the acoustic metamaterials are calculated. The peak frequency domain of the transfer-loss curve is consistent with the band gap frequency domain of the energy-band structure diagram. In the frequency range below 2 000 Hz, there are two complete band gaps and four directional band gaps. The analysis is carried out the generation mechanism of the structure’s band gap: the lower band gap boundary is the independent resonance of the unit cavity, and the upper band gap boundary is the joint resonance of the cavity and the external waveguide. Then, the impedance-tube test system is set up. The sound absorption range of the test sample with the sound-absorption coefficient greater than 0.6 is 800 to 1 600 Hz, and the sound-absorption effect is better than that of the traditional sound-absorption material melamine foam. Moreover, the test data is in good agreement with the results of transfer loss obtained from simulation and calculation.

关 键 词:Helmholtz共振腔 声学超材料 能带 传递损失 波导 

分 类 号:TB535[理学—物理]

 

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