Dispersion of waves in two and three-dimensional periodic media

Dispersion of waves in two and three-dimensional periodic media
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波在二维和三维周期介质中的色散

DOI:
10.1080/17455030.2020.1810822
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发表时间:
2020
影响因子:
--
通讯作者:
Vainberg, Boris
Vainberg, Boris
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Godin, Yuri A.;Vainberg, Boris

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我们考虑声波通过任意形状的夹杂物周期阵列的传播。当波长固定时,夹杂物的尺寸远小于阵列的周期。我们推导并严格证明了一般频率的色散关系,并表明,有例外的频率,其解决方案是一个集群的波传播在不同的方向与不同的频率,使色散关系不能被唯一地定义。并给出了球形夹杂物的计算实例。
We consider acoustic wave propagation through a periodic array of the inclusions of arbitrary shape. The inclusion size is much smaller than the array period while the wavelength is fixed. We derive and rigorously justify the dispersion relation for general frequencies and show that there are exceptional frequencies for which the solution is a cluster of waves propagating in different directions with different frequencies so that the dispersion relation cannot be defined uniquely. Examples are provided for the spherical inclusions.
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