| 基于二维声子晶体第一带边态的声学定向辐射 |
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| 引用本文： | 申风富,吴利华,邓科,赵鹤平.基于二维声子晶体第一带边态的声学定向辐射[J].应用声学,2012,31(1):75-78. |
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| 作者姓名： | 申风富 吴利华 邓科 赵鹤平 |
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| 作者单位： | 吉首大学物理学院 |
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| 基金项目： | 国家自然科学基金资助项目(No.11104113);湖南省自然科学基金资助项目(No.09JJ6011);湖南省高等学校科研基金资助项目(No.08A055,No.11C1057) |
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| 摘 要： | 采用多重散射方法研究二维四方钢/水声子晶体中线源的辐射问题。数值结果表明利用声子晶体ΓΜ方向的第一带边态可以实现声定向辐射。利用文中设计的三角形晶体结构既可以实现声波的单束定向辐射,还能够得到传播方向互相垂直的双束定向辐射。该研究对声子晶体功能器件的设计具有一定的意义。
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| 关 键 词： | 声子晶体 声波定向辐射 三角晶体结构 |
Acoustic directional radiation based on the first band-edge states of two-dimensional phononic crystals |
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| SHEN Fengfu,WU Lihu,DENG Ke and ZHAO Heping.Acoustic directional radiation based on the first band-edge states of two-dimensional phononic crystals[J].Applied Acoustics,2012,31(1):75-78. |
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| Authors: | SHEN Fengfu WU Lihu DENG Ke and ZHAO Heping |
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| Institution: | (College of Physics Science and Electronic Engineering,Jishou University,Jishou 416000) |
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| Abstract: | A multiple scattering method is applied to study the radiation of a line acoustic source placed inside a two-dimensional steel/water phononic crystal of square lattice.Numerical results show that it is possible to realize the acoustic directivity using the first band-edge states in the ΓΜ direction of the crystal.Using the triangular crystal structures designed in this paper,we realize a single-beam directional radiation as well as a dual-beam one with perpendicular directions.This research affords benefits for the designing of acoustic devices of phononic crystals. |
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| Keywords: | Phononic crystal Acoustic directional radiation Triangular crystal structures |
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