By use of geometric model and mathematic calculation, this paper draws a way for solving the alignment of vertical and rotational equipment.

通过建立几何模型、数学计算，得出一种有效解决竖直式转动设备对心的方法。

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Because the dynamic character of PMA is affected by permanent magnet and exciting current, in this paper, new mathematic model and equation are established and the calculation result is analyzed.

在动态计算中本文根据永磁和激磁电流共同作用这一特点，建立了相应的数学模型，给出了动态微分方程组的求解方法，并对动态过程进行了分析。

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By analysis, a calculation method of the initial time and allowable time for steel-bar corrosion is built. Then a mathematic model for anti-slide pile service life is established.

分析提出了钢筋开始锈蚀时间及钢筋锈蚀时间计算方法，据此提出了抗滑桩安全使用寿命预测数学模型。

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