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运用特征分析和事后修正法对无反射边界进行了分析，将两种常用的无反射边界方法（Ｔｈｏｍｐｓｏｎ无反射边界和Ｇｉｌｅｓ无反射边界）以统一的形式表达出来，得到这类边界的事后修正式．运用同一方法讨论了声能量从边界输入时声源的模化问题，给出单极源的边界声源数学模型．计算了单极源在均匀流中的声辐射．结果表明，文中方法计算准确，程序编制方便，适合于小振幅波动方程的计算．
The non-reflection boundary is analyzed by means of feature analysis and post-modification, and the two commonly used non-reflection boundary methods (Thompson non-reflection boundary and Giles non-reflection boundary) are expressed in a unified form. . Using the same method to discuss the sound source modeling when the acoustic energy is input from the boundary, the mathematical model of the boundary sound source of the monopole source is given. The acoustic radiation of a monopole source in a uniform flow was calculated. The results show that the method in this paper is accurate and convenient to program, which is suitable for the calculation of small amplitude wave equation.