宽频带薄膜型声学超材料附加质量分布规律分析

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (15) : 225-231.

论文

丁北1,2，王炜1,2

作者信息 +

Additional mass distribution law of broadband memberane-type acoustic metamaterial

DING Bei1,2, WANG Wei1,2

Author information +

文章历史 +

摘要

薄膜型声学超材料因其良好的低频域减振降噪性能而备受关注，其中涉及到的附加质量分布问题也具有重要的研究价值，直接关系到薄膜结构的整体隔声性能。考虑到现有针对质量分布规律的研究仍有待深化，本文以一类薄膜型声学超材料为对象，通过分析多种附加质量分布形式（集中、分散）对应的结构隔声特性，验证了等质量下分散结构相对于集中分布具备更好的隔声性能，进一步明确了质量块质量、数量及其布置环数对于隔声性能的影响规律，形成了可在低频域实现宽频降噪的质量分布方案，即：质量块均匀分布在圆膜上而不产生聚集。仿真及实验分析均表明，该方案能够在保持超材料深亚波长尺寸的同时，强化低频域宽频减振降噪性能，有利于实现结构轻量化设计，并为目标驱动的薄膜型声学超材料功能优化提供了参考依据。

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.

导出引用

丁北1,2，王炜1,2. 宽频带薄膜型声学超材料附加质量分布规律分析[J]. 振动与冲击, 2023, 42(15): 225-231

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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