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.
出处
《压电与声光》
CAS
CSCD
北大核心
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)
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
one-dimensional phononic crystals
low-frequency noise
elastic vibration band gaps
lumped-mass method
