Additional mass distribution law of broadband memberane-type acoustic metamaterial
DING Bei1,2, WANG Wei1,2
1.School of Mechanical Engineering, Tianjin University, Tianjin 300350, China;
2.Tianjin Key Laboratory of Nonlinear Dynamics and Control, Tianjin 300350, China
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.
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. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(15): 225-231.
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