宽频带薄膜型声学超材料附加质量分布规律分析  

Additional mass distribution law of broadband memberane-type acoustic metamaterial

作　　者：丁北 王炜[1,2] DING Bei;WANG Wei(School of Mechanical Engineering,Tianjin University,Tianjin 300350,China;Tianjin Key Laboratory of Nonlinear Dynamics and Control,Tianjin 300350,China)

机构地区：[1]天津大学机械工程学院,天津300350 [2]天津市非线性动力学与控制重点实验室,天津300350

出　　处：《振动与冲击》2023年第15期225-231,284,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金(12172248;12021002)。

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,该文章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。仿真及试验分析均表明,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。Membrane-type acoustic metamaterial attracts much attention due to its excellent performance in low frequency domain for vibration and noise reduction,the additional mass distribution problem involved also has important study value,it is directly related to the overall sound insulation performance of membrane-type structure.Here,considering the existing study on mass distribution law still needing to be deepened,a class of membrane-type acoustic metamaterials was taken as the study object,structural sound insulation characteristics corresponding to various additional mass distribution forms of concentrated form and dispersed form were analyzed to verify dispersed structures under the condition of equal mass having better sound insulation performance compared to centralized mass distribution,further clarify influence laws of mass blocks’mass,number,and their arrangement ring number on sound insulation performance,and form the mass distribution scheme being able to realize broadband noise reduction in low frequency-domain.This scheme was that mass blocks being uniformly distributed on a circular film without causing aggregation.Both simulation and experimental analysis showed that this scheme can keep deep subwavelength size of metamaterial,and enhance low-frequency domain broadband vibration and noise reduction performance to be conducive to realizing lightweight structural design,and provide a reference basis for functional optimization of target driven membrane-type acoustic metamaterials.

关 键 词：薄膜型声学超材料 质量分布 隔声性能 

分 类 号：O422.4[理学—声学] TB353.1[理学—物理]