Using the Newton-Raphson iteration method, the node coordinates of elements on the reference configuration or the current configuration, can be obtained efficiently.
使用牛顿—瑞费逊迭代法，可快捷地得到初始构形或当前构形上的节点坐标。
Then using the approximate solution as initial value of iteration, the nonlinear equations for the closest point of collapse are solved directly by Newton-Raphson method.
然后采用牛顿-拉夫逊法直接对最近电压崩溃临界点模型所构成的非线性方程组进行迭代求解。
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