Application of magnetoelastic materials in spatiotemporally modulated phononic crystals for nonreciprocal wave propagation
Application of magnetoelastic materials in spatiotemporally modulated phononic crystals for nonreciprocal wave propagation
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DOI：
10.1088/1361-665x/aa9d3d
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发表时间：
2017
影响因子：
4.1
通讯作者：
M. Ansari;M. Attarzadeh;M. Nouh;M. Karami
中科院分区：
文献类型：
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作者：
M. Ansari;M. Attarzadeh;M. Nouh;M. Karami
本文提出了一种改变声子晶体在空间和时间上的性质以实现非互易波传输的物理平台。研究了磁弹性材料在弹性声子系统中的应用。在外加磁场的作用下，磁弹性材料的材料性质会发生显著的变化。该特性用于设计具有所需波传播模式的系统。磁弹性介质的性质是以行波模式变化的，这种模式在空间和时间上都是变化的。具有这种调制的声子晶体表现出单向波传播行为。提出了一种用于时变系统建模的扩展传递矩阵法(TMM)。用这种方法求出了倒易杆和非倒易杆的阻带和通带。TMM用于求解磁弹性杆的传递函数。所得结果与理论Floquet-Bloch方法和数值模拟的结果相吻合。结果表明，对于具有时变特性的系统，前向波传播的传递函数中的阻带与后向波传播中的阻带是不同的。所提出的配置使得一类结合了非互易波传播的智能结构能够物理实现。
In this paper, a physical platform is proposed to change the properties of phononic crystals in space and time in order to achieve nonreciprocal wave transmission. The utilization of magnetoelastic materials in elastic phononic systems is studied. Material properties of magnetoelastic materials change significantly with an external magnetic field. This property is used to design systems with a desired wave propagation pattern. The properties of the magnetoelastic medium are changed in a traveling wave pattern, which changes in both space and time. A phononic crystal with such a modulation exhibits one-way wave propagation behavior. An extended transfer matrix method (TMM) is developed to model a system with time varying properties. The stop band and the pass band of a reciprocal and a nonreciprocal bar are found using this method. The TMM is used to find the transfer function of a magnetoelastic bar. The obtained results match those obtained via the theoretical Floquet–Bloch approach and numerical simulations. It is shown that the stop band in the transfer function of a system with temporal varying property for the forward wave propagation is different from the same in the backward wave propagation. The proposed configuration enables the physical realization of a class of smart structures that incorporates nonreciprocal wave propagation.