The authors propose a new method named the RAO-based Translation Process (RTP) method for simply estimating the extreme value distribution of the nonlinear ship response in irregular waves based on the nonlinear response in regular waves. The proposed method combines the existing idea of the Nonlinear Correction (NLC) method, which is based on wave height-dependent RAO, with the theory of the translation process, and thus has both simplicity and a clear theoretical background. Furthermore, it is positioned as an extension of the Equivalent Design Wave (EDW) method used in conventional ship structural design. The validity of the proposed method is confirmed through a numerical study on the extreme value distribution of hull-girder sectional forces considering body nonlinear effects. The proposed method can be used for various purposes, and in particular, it can reduce the computational demand for strength evaluation by Direct Load and Structure Analysis (DLSA), which is a computationally extensive analysis method. Therefore, the proposed method is expected to make a significant contribution to structural design.

作者提出了一种名为基于 RAO 的平移过程（RTP）的新方法，用于根据规则波浪中的非线性响应来简单估计不规则波浪中船舶非线性响应的极值分布。该方法将现有的基于波高相关RAO的非线性校正(NLC)方法的思想与平移过程的理论结合起来，因此既简单又具有清晰的理论背景。此外，它被定位为传统船舶结构设计中使用的等效设计波（EDW）方法的延伸。通过对考虑车身非线性效应的船体梁截面力极值分布的数值研究，证实了该方法的有效性。该方法可用于多种目的，特别是，它可以减少直接载荷和结构分析（DLSA）强度评估的计算需求，DLSA是一种计算量大的分析方法。因此，所提出的方法有望对结构设计做出重大贡献。