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2-D numerical simulation of acoustic wave phase conjugation in active medium

机译:活性介质中声波相位缀合的2-D数值模拟

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The effect of parametric wave phase conjugation (WPC) in application to ultrasound acoustic waves in magne-tostrictive solids has been addressed numerically in [1] using 1-D unsteady formulation. Here we apply the numerical method presented in [2], [3] to the analysis of probable 2-D effects by practical implementation of WPC, The model describes universally elastic solids and liquids. A source term is included in the model similar to [1] to describe coupling between deformation of magnetostrictive material and external periodic magnetic field. Supplementary to the 1-D simulations, the present model involves longitudinal/transversal mode conversion at the sample boundaries and separate magnetic field coupling with dilatation and shear stress. The influence of those factors in a 2-D geometry on the potential output of a magneto-elastic wave phase conjugator is analyzed in this paper. The process under study includes propagation of a wave burst of a given frequency from a point source in a liquid into the active solid, amplification of the waves due to parametric resonance and formation of time-reversed waves, their radiation into liquid and focusing.
机译:参数波相位共轭的(WPC)在应用到超声声波在马格纳-tostrictive固体效果已经在[1]使用1- d不稳定制剂数值处理。在这里,我们通过实际执行WPC的应用[2]中提出的数值方法,[3]的可能的2-d的影响的分析,该模型描述了普遍弹性固体和液体。源项被包括在类似于[1]描述的磁致伸缩材料和外部的周期性磁场的变形之间的耦合模型。补充到1-d的模拟,本模型包括在所述样本边界纵向/横向模式转换,并与扩张和剪切应力分离磁场耦合。的在上的磁弹性波相位共轭器的电势输出2-d几何这些因素的影响,本文进行了分析。所研究的方法包括脉冲串给定的频率的来自点光源的液体进入波的活性固体,放大一个波的传播由于参数共振和地层时间反转波的,它们的辐射转换成液体和聚焦。

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