低频噪声吸收长期以来都是一个具有挑战性的课题，当前热点研究的声学超材料因其新颖的物理特性，能够有效的解决低频噪声的吸收问题。设计了一种微缝卷曲耦合低频吸声超材料，首次建立了微缝与卷曲通道的耦合吸声理论模型与有限元模型，并进行了试验验证，分析了结构的吸声特性与吸声机理，最后通过并联两个峰值频率不同的吸声单体协同耦合拓宽吸声带宽。研究结果表明：该结构在共振频率420 Hz处取得97%的声波能量吸收，此时结构总厚度(27 mm)为共振频率下对应工作波长的1/30，具有良好的亚波长尺度特性；试验结果良好；结构的吸声带宽被拓宽至49%，实现了低频宽带吸声。该吸声超材料结构简单，易于加工制造，在低频噪声控制工程领域中具有实际应用前景。
Abstract
Low frequency noise absorption is a challenging topic for a long time.The current hot study on acoustic metamaterials can effectively solve the problem of low frequency noise absorption due to their novel physical properties.Here, a low-frequency sound absorption metamaterial with micro slit-curl coupling was designed.The theoretical model and finite element model of coupling sound absorption of micro slit and curl channel were established for the first time, and the test verification was conducted.Then, this metamaterial structure’s sound absorption characteristics and mechanism were analyzed.Finally, the sound absorption bandwidth was broadened through collaborative coupling of two sound absorption monomers with different peak frequencies in parallel.The results showed that the metamaterial achieves 97% acoustic energy absorption at the resonance frequency of 420 Hz, the total thickness (27 mm) of the metamaterial is 1/30 of the corresponding working wavelength at the resonance frequency to has good sub-wavelength scale characteristics;, the test results are good; the sound absorption bandwidth of the metamaterial is increased by 49% to realize low-frequency broadband sound absorption; this sound absorption metamaterial has a simple structure, and is easy to manufacture, it has a practical application prospect in low frequency noise control engineering field.
关键词
微缝 /
卷曲通道 /
低频吸声 /
声学超材料
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Key words
micro slit /
curl channel /
low-frequency sound-absorbing /
acoustic metamaterials
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