本文针对声波方程，给出了完全匹配层吸收边界方法。
Aimed at acoustic wave equation, the paper gave absorbing boundary condition by using perfectly matched layer.
通过完全匹配层方法对截断边界的吸收处理，解决了无限自由空间的计算问题。
A perfect matched layer method is used to resolve the numerical simulation in free space.
目前，效果最好的吸收边界条件是完全匹配层（PML）。
The use of perfectly matched layer (PML) in cylindrical coordinates avoids the wasted computation.
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