Additional mass distribution law of broadband memberane-type acoustic metamaterial

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (15) : 225-231.

DING Bei1,2, WANG Wei1,2

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Abstract

Membrane-type acoustic metamaterial has attracted much attention due to its excellent vibration reduction and sound insulation performance in low frequency domain. The additional mass distribution problems involved have great research value, which directly influence the overall performance of the structure. Considering the latent regularity of mass distribution is not clear, membrane-type acoustic metamaterials with the same total mass while different mass distribution patterns are researched in this paper. Through comparing the characteristics with centralized and dispersing mass blocks distribution patterns, it is found that the structure with the latter pattern obtains wider bandwidth. The influences of the size and mass of the blocks and the number of distribution ring regions are discussed. A mass distribution pattern namely the blocks are evenly distributed on the membrane without aggregation is formed. Both simulation and experimental results indicate the pattern is conducive to maintain deep sub-wavelength size, and enhance its performance obviously. It also provides reference for lightweight design and target-driven functional optimization of membrane-type acoustic metamaterials.

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membrane-type acoustic metamaterials / mass distribution / sound insulation performance

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DING Bei1,2, WANG Wei1,2. Additional mass distribution law of broadband memberane-type acoustic metamaterial[J]. Journal of Vibration and Shock, 2023, 42(15): 225-231

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