On the basis of these results and through calculation of the torsion moment on the cross section, a theoretical formula of the flexural center is derived for the cylinder.

基于上述结果并通过对横截面上扭矩的计算，导出了用于计算柱体弯曲中心的理论公式。

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Key parts including piezoelectric transducer and amplitude transformer with a cylindrical hole in the center, and flexural vibration disk are analyzed and calculated.

提出了珩磨杆、珩磨头体均不振动的设计思想，分析计算了中心有圆柱孔的压电换能器和变幅杆，以及弯曲振动圆盘等关键部分。

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