把营运船舶的船体剖面模数看做受蚀耗影响的随机变量，基于随机变量函数线性化提出一个简单方法。
Hull section moduli of ships in service are treated as random variables due to corrosion and wear. A method based on linearization of a random function is described.
船舯断裂的主要原因之一是船体构件因长期受到腐蚀、疲劳等作用而造成船舯剖面模数降低，进而削弱了总纵强度。
The rupture in the middle of bulk cargo is due to the corrosion and fatigue of components in long term usage, which leads the section modulus to reduce and the general longitudinal strength to weaken.
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