本文讨论一列平面波与一列平面行波脉冲的声相互作用，显然这两个波不仅都满足波动方程，而且可以用来讨论公共区之外的声散射声问题。

In this paper, the interaction between a cw plane wave and a plane pulse travelling with sound speed is considered. Both of them satisfy the homogeneous wave equation.

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最后用数学软件Maple对行波方程进行数值模拟，得到纽结波的平面模拟图。

Finally, the planar graphs of the traveling wave equation are simulated by using mathematical software MAPLE.

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该法在行波法生成平面三角形网格的基础上，将一个三角形单元分解为三个四边形单元。

Based on the advancing front technique developed for triangular mesh generation, quadrilateral mesh can be generated by dividing each triangular element into three quadrilateral elements.

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