南京大学学报（自然科学版）2025，Vol.61Issue(5)：772-780,9.DOI:10.13232/j.cnki.jnju.2025.05.006
双层薄膜声学超材料的低频吸声特性研究
The study of low-frequency sound absorption properties in a double-layer acoustic metamaterial
摘要
Abstract
To overcome the limitations of traditional materials in low-frequency noise reduction,a MAM(Membrane-type acoustic metamaterial)composed of double-layer membranes,mass rings,and cavities is proposed in this paper.The sound absorption mechanism is elucidated through the analysis of its resonance modes,equivalent parameters,and acoustic impedance.Utilizing finite element analysis,the sound absorption coefficient within the frequency range of 100 to 600 Hz is calculated,and the effects of the geometric parameters of the mass ring,membrane,and cavity on the sound absorption coefficients are discussed and compared.Besides,the sound absorption performance is optimized by parallel connecting multiple MAM units and changing the position of the mass ring.These results indicate that the sound absorption performance of the double-layer MAM cell structure at low frequencies is better than that of the conventional structure,and the corresponding operating frequencies can be altered by changing the geometric parameters,positions,and parallel connection of multiple units,thereby increasing the sound absorption coefficient and broadening the bandwidth.This study can provide implications for the optimization of sound absorption performance by MAM.关键词
低频噪音/薄膜型声学超材料/吸声系数Key words
low-frequency noise/membrane-type acoustic metamaterial/absorption coefficient分类
数理科学引用本文复制引用
胡碗铷,李义丰,蓝君..双层薄膜声学超材料的低频吸声特性研究[J].南京大学学报（自然科学版）,2025,61(5):772-780,9.基金项目
国家自然科学基金(61571222,12504517),江苏省自然科学基金(BK20210541),江苏省高校自然科学研究项目(21KJB140003) （61571222,12504517）
