Artificially matched layers

这些 PREP7 命令用于创建旨在吸收高频波的人工匹配层（PML 或 AML）。

Mapdl.pmlopt([esys, lab, xminus, xplus, ...])	Defines perfectly matched layers (PMLs) for acoustic and structural
Mapdl.pmlsize([freqb, freqe, dmin, dmax, ...])	Determines number of PML layers.