Band gap characteristics of bilateral Helmholtz acoustic metamaterial

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (23) : 144-150.

SUN Weipeng,SHEN Mingzhao,ZHONG Kexin,LIU Yuanyuan,ZHAO Daoli

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Abstract

In order to effectively suppress low-frequency noise and broaden the low-frequency band gap, a double-sided Helmholtz acoustic metamaterial with low-frequency broadband is designed. The band structure and transmission spectrum of the system are calculated by the finite element method. The formation mechanism of band gap is analyzed by the vibration modes of each point on the band structure. The spring mass model is used to calculate the equivalent band gap frequency, and the influence of structural parameters on the band gap is explored. The results show that the band gap overtaking phenomenon can be realized by changing the structural parameters. When the Helmholtz resonator material is tungsten, the wall thickness and height are 1.0 mm and 6.0 mm respectively, the cladding radius is 4.6 mm, and the substrate thickness is 1.0 mm, the band gap starting frequency of the model is 195.8 Hz. Under this parameter, the first complete band gap width is broadened to 758.1 Hz. The designed two-sided Helmholtz acoustic metamaterial can provide a reference for low-frequency noise control.

Key words

Acoustic metamaterials / Helmholtz resonant cavity / local resonance / low frequency broadband

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SUN Weipeng,SHEN Mingzhao,ZHONG Kexin,LIU Yuanyuan,ZHAO Daoli. Band gap characteristics of bilateral Helmholtz acoustic metamaterial[J]. Journal of Vibration and Shock, 2023, 42(23): 144-150

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