南京理工大学学报（自然科学版）Issue(6)：869-874,6.
准一维声子晶体中兰姆波低频禁带特性研究
Low-frequency band gap performance for Lamb waves in quasi-one-dimensional phononic crystal
摘要
Abstract
To optimize the band gap structure of Lamb waves in one-dimensional ( 1 D ) phononic crystal(PC)thin plates,quasi-1D PC thin plates are established by embedding a row of air holes pe-riodically in the matrix components in one side of the plate. The effects of the holes’ radii on the band gap of the quasi-1 D PC thin plates are calculated by using the super cell plane wave expansion method and finite element method. The disturbance effects of the embedded air scatterers on the dis-placement field of the eigenmodes are analyzed. The optimizion of air column scatterers on this phononic crystal Lamb wave band gap structure is researched. The results show that with the increase of the radii of the air holes, the coupling between the same lower-order mode Lamb waves is enhanced significantly,the number and bandwidths of the band gaps are increased significantly too, and the occupation ratio of the forbidden gaps in the 0-4 MHz low frequency range is about 70%.关键词
兰姆波/声子晶体/低频/禁带/超原胞平面波展开法/有限元法Key words
Lamb waves/phononic crystal/low-frequency/band gaps/super cell plane wave expansion method/finite element method分类
数理科学引用本文复制引用
丁红星,戴丽莉,沈中华,陆建,倪晓武..准一维声子晶体中兰姆波低频禁带特性研究[J].南京理工大学学报（自然科学版）,2013,(6):869-874,6.基金项目
国家自然科学基金(11274175 （）
61108013) （）
高等学校博士学科点专项科研基金(20103219120040) （20103219120040）
江苏省高校“青蓝工程”(2012) （2012）
