Triple integral expression of the radiation impedance of square piston is deduced and the numerical results of the radiation impedance are calculated with the method of Gaussian numerical integral.
利用高斯数值积分方法，推导了方形活塞辐射阻抗的三重积分表达式，计算了方形活塞声源的辐射阻抗。
This paper points out the variable substitution method of triple integral of elliptical volume and examples its applications.
指出了椭球形区域上三重积分的一科变量替换方法，并说明了其应用。
This paper indicates and proves the method of making use of symmetry to predigest calculation of cylindrical coordinates triple integral.
运用对称性简化计算柱面坐标三重积分，并给予证明。
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