Two calculational methods for nonlinear analysis are adopted, that is, the improved Euler method and the Newton iteration method.
实现了两种求解非线性问题的数值计算方法：改进欧拉法和增量牛顿迭代法。
Based on the analysis of the look-up table method and Newton iteration algorithm the paper improves the Newton iteration method for the square root calculation.
在分析了查表法以及牛顿迭代法的基础上，对开平方计算的牛顿迭代法进行了改进。
The Newton iteration method is used to solve the economic pressure on the unknown node, so as to calculate the economic head loss and economic pipe diameter of each section,.
采用牛顿迭代法来求解各未知节点的经济水压，进而得出各管段的经济水头损失、经济管径和水源二级泵站的经济扬程。
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