Laminated multi-channel structure acoustic metamaterial broadband muffling characteristics

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (1) : 305-314.

ACOUSTIC RESEARCH AND APPLICATION

Laminated multi-channel structure acoustic metamaterial broadband muffling characteristics

XU Chi1,2, CHEN Yinghang1,2, WANG Chao1,2, LIU Ningning3, DONG Xiaori1,2, GUO Hui3, LIU Chunjing*1,2

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Abstract

An innovative acoustic metamaterial was developed by stacking multi-channel structures layer by layer. Theoretical analysis, numerical simulation and experiment were introduced to study the characteristic and generation mechanism of the sound attenuation. A genetic algorithm was utilized to find the optimal combination scheme of the chamber length to broaden the sound attenuation frequency band, and its underlying logic was discussed. Results show that the structure can be regarded as an acoustic waveguide attached multiple side-branched Helmholtz resonators, and its transmission loss curve has multiple continuous resonance peaks to achieve broadband sound attenuation. The broadband sound attenuation can be improved by adjusting the length and width of the chamber, increasing the thickness of the structure, and creating the non-uniform array. When optimizing the structure with different size parameters, the genetic algorithm consistently maximizes the sound attenuation bandwidth by creating as many Helmholtz resonators with stronger single-cell sound attenuation as possible. The broadband sound attenuation is verified by the experimental results. The obtained results can be used as a guide for reducing pipeline noise in narrow space.

Key words

acoustic metamaterials / sound attenuation / coiled channel structure / Helmholtz resonator / genetic algorithm

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XU Chi1, 2, CHEN Yinghang1, 2, WANG Chao1, 2, LIU Ningning3, DONG Xiaori1, 2, GUO Hui3, LIU Chunjing1, 2. Laminated multi-channel structure acoustic metamaterial broadband muffling characteristics[J]. Journal of Vibration and Shock, 2025, 44(1): 305-314

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