三元周期结构声禁带形成机理  

Mechanism of broad acoustic band-gap in the three-component composite

作　　者：华佳[1] 张舒[1] 程建春[1] 

机构地区：[1]南京大学近代声学国家重点实验室,南京210093

出　　处：《物理学报》2005年第3期1261-1266,共6页Acta Physica Sinica

基　　金：国家杰出青年基金 (批准号 :10 12 5 417);国家重点基础研究发展规划项目 (批准号 :5 13 0 7)资助的课题 .~~

摘　　要：研究了二维三元周期结构的声禁带加宽现象产生的物理机理 .用有限元方法分别计算了嵌入 1,3和 5排铁柱和具有橡胶包层铁柱的周期复合结构的声能量传输谱和禁带形成过程 .通过比较二元和三元周期复合结构中的声场分布情况 ,认为三元样品宽声禁带的形成机理是Bragg反射和局域化共振共同作用的结果 ,前者在高频段的作用更为明显 ,而后者在低频段起主要作用 .Mechanism of broad acoustic band-gap in the two-dimensional three-component composite is investigated by calculating acoustic transmission spectra and acoustic fields for different inserted steel rows embedded in epoxy resin matrix with or without rubbers as the coating material. By comparing the acoustic fields inside the two- and three-component crystal slabs, one can conclude that the broad acoustic band-gap in the. three-component crystal slab is formed by the coexistence of the Bragg reflection of a periodic structure and the localized resonance in the soft rubber. The former is evidence in higher frequency and the latter is dominant in lower frequency with the wavelength longer than that of the coating layer.

关 键 词：禁带 周期结构 局域化 嵌入 反射 二维 二元 频段 传输谱 低频 

分 类 号：TB33[一般工业技术—材料科学与工程]