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首页> 外文期刊>Key Engineering Materials >The Study of Acoustic Band Gaps In 2-D Air/Aluminum and Steel/Epoxy Phononic Structure
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The Study of Acoustic Band Gaps In 2-D Air/Aluminum and Steel/Epoxy Phononic Structure

机译：二维空气/铝和钢/环氧声子结构中的声带隙研究

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Analogous to the photonic band gap structure, phononic band gaps could be found in systems comprised of two materials with different elastic properties called "phononic crystals." Acoustic waves propagating in such structures also exhibit band gaps and may find applications in the high frequency acoustic wave devices. In this paper, the results of acoustic wave propagation in two-dimensional PC calculated with finite-difference time-domain (FDTD) method will be presented. The perfectly matched layer (PML) method was adopted to serve as absorbing boundary conditions (ABC). Band gaps of the 2-D PC were calculated by the FDTD method, and the numerical result has revealed more details of the mixed mode and transverse mode for acoustic wave propagation in isotropic materials. Both the transmission coefficient and images of displacement were obtained from the calculations and the phenomenon of reflection and diffraction can be observed clearly. A phononic structure consists of a square periodic arrangement of cylindrical holes in an aluminum alloy was fabricated and the corresponding band gap measurements were conducted. The experimental results have shown good accordance with those predicted using the FDTD method. It is believed that the proposed numerical formulation can be used to design a phononic crystal and find possible applications in the area of wave-guide channel or filter analyses.
机译：与光子带隙结构类似，声子带隙可以在由两种具有不同弹性特性的材料（称为“声子晶体”）组成的系统中发现。在这样的结构中传播的声波也表现出带隙并且可以在高频声波装置中找到应用。本文将介绍利用时域有限差分法（FDTD）计算二维PC中声波的传播结果。采用完全匹配层（PML）方法作为吸收边界条件（ABC）。通过FDTD方法计算了二维PC的带隙，数值结果揭示了声波在各向同性材料中传播的混合模式和横向模式的更多细节。通过计算获得了透射系数和位移图像，可以清楚地观察到反射和衍射现象。制造了由铝合金中圆柱形孔的正方形周期性排列组成的声子结构，并进行了相应的带隙测量。实验结果表明，与使用FDTD方法预测的结果相吻合。可以相信，所提出的数值公式可用于设计声子晶体，并在波导通道或滤波器分析领域找到可能的应用。

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