南京大学学报：自然科学版2012，Vol.48Issue(5)：531-536,6.
三明治型声子晶体中Lamb波传播特性的研究（英文）
Study on the band gap variation caused by constructed materials in a sandwich phononic crystal
摘要
Abstract
The characteristics of Lamb waves in phononic crystal plate have been studied recently as the wide applications of Lamb waves and great popularity of phononic crystal.This study distinguishes the models proposed in the previous papers and focuses on the influences of the loading layers that have different hardness.A sandwich-structured model,which is composed by a one-dimensional phononic crystal and two kinds of pure materials designed as the base layer and the top layer,is proposed and used to investigate the influence on the band gap distribution of Lamb waves by the finite element method.Based on the theoretical model,the transmitted power spectra of sandwich structured plate are calculated.The result demonstrates that when the base layer and the top layer are of hard material,the effect caused by layers on band gaps is significant and the band gaps disappear rapidly with the increasing thickness of layers.On the other hand,if the base and top layers are constructed with soft material,a new band gap gradually appears with the increasing thickness of layers,and tends to combine with the original band gap.In addition,for the case of medium-hardness loading layers,the influence of the loading layers is between those of the two cases described above.Thus,these properties can be applied to design and adjust band gap distribution artificially.关键词
声子晶体/带隙/Lamb波/有限元Key words
phononic crystal/band gap/Lamb wave/finite element method分类
数理科学引用本文复制引用
刘聪,徐晓东,王敬时,刘晓峻..三明治型声子晶体中Lamb波传播特性的研究（英文）[J].南京大学学报：自然科学版,2012,48(5):531-536,6.基金项目
National Natural Science Foundation of China （）
