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我们设计了二维横向不均匀介质中的弹性波传播的一个混合方法。这个算法是以有限差分法和边界积分方程法的组合为基础的.它包含了这二种方法之中每一方法的专门应用以指定该模型结构的范畴;有限差分法是用于计算非均匀区域附近的一组边界值(波场和压力)。近场响应的延拓因而是借助于边界积分方程法计算的,在一个数值例子中,混合法已用于计算嵌入在均匀的包围介质中的弹性透镜体的平面波响应。这个例子说明在同样精度的条件下,混合法比纯粹的有限差分计算法是更有效的模拟方法。
We have devised a hybrid approach to the propagation of elastic waves in two-dimensional horizontally inhomogeneous media. This algorithm is based on a combination of the finite difference method and the boundary integral equation method, which includes the specialized application of each of these two methods to specify the scope of the model structure; the finite difference method is used to calculate non-uniform A set of boundary values (wave fields and pressures) near the area. The extension of the near-field response is thus calculated by means of the boundary integral equation method. In a numerical example, the hybrid method has been used to calculate the plane wave response of an elastic lens body embedded in a uniform surrounding medium. This example shows that hybrid methods are more efficient than pure finite-difference methods under the same precision.