点缺陷折叠结构声学超材料的声局域化特性

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摘要以折叠结构为基本单元组成点缺陷声学超材料。采用数值模拟和实验分析的方法探索结构低频声局域化机理，分析结构参数对声局域化模态的影响规律。结果表明，该结构在800 Hz以下可产生多个声局域化模态。在频率为222 Hz、362 Hz、385 Hz、408 Hz和511 Hz入射平面波作用下，结构可在中心腔体或周边腔体中实现声压局部放大，这种现象是由于结构内各子腔体的声学虹吸效应或它们之间的耦合共振所致。通过增加中心腔体尺寸、隔板数量、隔板长度，可降低结构声局域化响应频率。实验结果进一步证明了结构在低频范围内具有放大多个频段声波的能力。研究成果可为实现低频宽带声能聚集提供借鉴。

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	徐驰1
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	陈应航1
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	郭辉3
	金文超3
	刘涛4
	靳奉华3
	刘春景1
	2

关键词 ：声局域化, 声学超材料, 空间折叠结构, 点缺陷

Abstract：An innovative structure, composed of coiled acoustic metamaterials having a point defect, is proposed to collect and amplify the low-frequency broadband acoustic waves. Numerical simulation and experiment were introduced to analyze the sound collection mechanism of the structure. The impacts of the structural parameters on sound collection performances were further studied. Results reveal that the center and around cavities obviously amplify the sound pressures under the excitation of incident waves at 222 Hz, 362 Hz, 385 Hz, 408 Hz and 511 Hz. These characteristics can be attributed to the acoustic siphon effect of different cavities and their coupling resonances. The regulation of sound collection effect can be achieved by matching the structural parameters. In general, a structure tends to have better broadband low-frequency sound collection when it has a larger center cavity, longer and more partitions. The experimental results prove the sound collection of the proposed structure. Those results obtained herein, can be used as a guide toward achieving low-frequency broadband sound energy collection.

Key words： sound collection acoustic metamaterials coiled structure point defect

收稿日期: 2021-08-25 出版日期: 2023-08-28

引用本文:

徐驰1,2，陈应航1,2，郭辉3，金文超3，刘涛4，靳奉华3，刘春景1,2. 点缺陷折叠结构声学超材料的声局域化特性[J]. 振动与冲击, 2023, 42(16): 196-201.
XU Chi1,2,CHEN Yinghang1,2,GUO Hui3,JIN Wenchao3,LIU Tao4,JIN Fenghua3,LIU Chunjing1,2. Sound collection of coiled acoustic metamaterials with point defect. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(16): 196-201.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2023/V42/I16/196

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