Low frequency sound absorbing metamaterials with micro slit-curl coupling

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (17) : 229-233.

WU Fei1, CHEN Wenyuan2, JU Zegang2, YAO Lingyun2, HU Man2

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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.

Key words

micro slit / curl channel / low-frequency sound-absorbing / acoustic metamaterials

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WU Fei, CHEN Wenyuan, JU Zegang, YAO Lingyun, HU Man. Low frequency sound absorbing metamaterials with micro slit-curl coupling[J]. Journal of Vibration and Shock, 2021, 40(17): 229-233

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