一维声子晶体在防止低频噪声中的应用  

The Application of One-dimensional Phononic Crystals to Preventing Low-frequency Noise

作　　者：徐超[1] 胡丽芬[1] 董兴成[1] 刘应开[1] 

机构地区：[1]云南师范大学物理系,云南昆明650092

出　　处：《压电与声光》2010年第5期859-862,共4页Piezoelectrics & Acoustooptics

基　　金：国家自然科学基金资助项目(10764005);教育部新世纪优秀人才支持计划基金资助项目(NCET-08-0926);云南省自然科学基金资助项目(06A0025Q;2007PY01-41);云南省教育厅基金资助项目(06Y091)

摘　　要：应用集中质量法研究了集中质量数n、晶格常数a、组分比t、弹性模量E及密度ρ等因素对一维声子晶体带隙的影响。结果表明,带隙起始频率及带宽随a增加而减小,随t增加而快速增大(当t>1);带隙起始频率随两种材料E差值与ρ差值增加而减小,而带隙截止频率却不变;带隙精度则随n增加而增大。据此设计出一种能屏蔽约59～557Hz范围内低频噪声的复合结构声子晶体。The effects of the number of lumped-mass n,lattice constant a,composition ratio n,elastic modulus E and the density ρ on the band gap of the 1-D phonon crystals have been studied by using the lumped-mass method.The results showed that the initial frequency of the band gap and the forbidden bandwidth decreased with the increase of the lattice constant a while increased rapidly with the increase of t （t 1）.The initial frequency of the band gap decreased with the increases of both the variances of the elastic modulus E and the density ρ while the cut-off frequency of the band gap kept constant.With the increase of the number of lumped-mass n,the accuracy of the band gap increased.Therefore the composite of phonon crystals are designed to shield the low-frequency noise in the range of 59～557 Hz.

关 键 词：一维声子晶体 低频噪声 弹性波振动带隙 集中质量法 

分 类 号：O321[理学—一般力学与力学基础] O422[理学—力学]