而后，分别采用时域方法和谱分析方法，预报快艇在不规则波中的运动响应，进而确定总纵弯矩。

Then the motion responses in a random seaway are predicted in time and frequency domain, and the bending moment of boat's girder is further deduced.

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目前，计算总纵极限弯矩的方法主要有三种，即非线性有限元法，理想结构单元法和逐步破坏分析法。

There are three main methods by far, nonlinear finite element method, idealized structural unit method and progressive collapse analysis method.

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