为提高精度，在渐变应力比突变应力更符合实际的基础上提出应力在各时段内线性变化的假定，在此假定下推导了应力计算的一般公式，用于实测应变资料的分析计算。
Based on an analysis of the sources of errors, a linear variation of the stress at each stage was assumed, and a general formula for stress calculation was deduced.
结果建立了用于计算机辅助设计的镍钛记忆合金牵引器有限元模型，可以预测一定形状的牵引器在变形过程中(各时段)其本身结构中各节点、单元的受力、位移情况。
Results the finite element model of NTMA tractor for CAD was set up, which could predict the strength and displacement of every node and element of its own structure in the course of deforming.
在优化分段的基础上，根据各控制时段内不同时刻的网损及电压质量，再决定是否用OLTC进行二次调节。
After the partition results being achieved, a secondary control strategy of the OLTCs is implemented depending on the voltage quality and energy loss reduction in the period of specified interval.
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