Tuning the band structure of locally resonant phononic crystal by hierarchical structure

来源 :The 5th Asian Conference on Mechanics of Functional Material | 被引量 : 0次 | 上传用户:yuantian723
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
  Locally resonant phononic crystal (LRPC) is one of the most promising materials in vibration and noise control because it has low frequency stop band and the cell size is much smaller than the wave length of the stop band.An interesting problem is to tune the stop band frequencies of the LRPC to meet the demands for different situations in real application.As is known to all,the stop band of the LRPC is determined by the single cell rather than the periodic arrangement which works in the Bragg scattering phononic crystal.Here,the hierarchical structure is utilized to change the stop band of the LRPC.The band structures and the corresponding mechanisms of the LRPCs with different inclusions are investigated by the finite element method.The amount of the stop band as well as the frequency range are proved to be tuned.Moreover,the hierarchical structure of the LRPC bring more changes in the microstructure of the cell as the geometrical size,material constants and the structure arrangement of the inclusion can be tuned.As a result,the stop band can be further tuned.These results can be used to extend and lower the stop band in LRPC which are helpful in noise and vibration control.
其他文献
  Even inherently brittle hollow silicon nanoparticles (NPs) can withstand larger strain to failure than solid NPs.However,the influence of wall thickness on
会议
  Polarization switching induced by local mechanical force via flexoelectric effect has recently attracted great attention since it may enable applications in
会议
  Surface instabilities in bilayer systems composed of a thin,hard film bonded to a thick,soft substrate have been studied extensively in recent years both ex
会议
  The flexoelectric effect is coupling of polarization and strain gradient,which exists in wide variety materials and presents strong size-dependent at the na
  Graphene is the thinnest,one-atom thickness material in nature,and has unique mechanical,electronic and optical properties.However,the small out-of-plane ri
会议
  In many engineering fields nowadays functionally graded materials (FGM) are used for structural applications.Functionally graded materials normally consist
  Functionally graded materials (FGM) are finding various applications in different engineering fields due to gradual change of material properties through th
  The hoop flexible structure has light weight,great flexibility,weak damp and large size.These characteristics cause low natural frequency.The external excit
  The e lectromechanical coupling and pyroelectric properties of (001)-,(110)-and (111)-oriented (1-x)Pb(Mgl/3Nb2/3)O3-xPbTiO3[(1-x)PMN-xPT]thin films are inv
会议
  When waves propagate in a certain structure,the dispersion equations are usually transcendental equations about wavenumber and frequency,which does not allo