Studies the computation method of a circular constant, obtain a rectangular formular, and discusses some difficult problems with parameter transformation.
对循环常数的计算方法进行了研究，提出了一个矩形公式，并用参数变换法对一些疑难问题进行了讨论。
The big difference between measured and theoretic manifold of the circular array showed that the broadband constant beamwidth beamforming method used in the paper has good tolerance.
实验圆阵的实测阵列流形和理论阵列流形存在较大误差，这表明该文采用的可适用于任意结构阵列的宽带恒定束宽波束形成方法具有良好的宽容性。
NC machine is used to ensure that longitudinal and circular weldings are produced at a constant speed and the welding point is always in flat position.
数控主机用于保证箱底纵、环焊缝焊速恒定并使焊接点始终处于平焊位置。
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