【摘要】 为了解决具有多个不确定性因素舰船结构系统的可靠性分析问题 ,这些不确定的因素包含结构元件的面积、长度、弹性模量、结构强度和外载荷等 ,服从统计规律 ,可作为随机变量处理 .这样在结构系统的可靠性分析中 ,建立的极限状态方程 ,实际上是一个含有多随机变量的非线性函数 ,其中有的量 (如位移等 )难以用显式表达 .在这种情况下 ,为了提高系统失效概率计算的精确性 ,采用了改进的一次二阶矩法和随机有限元法求解系统的失效概率 .该方法简便合理 ,置信度高 ,适合工程的应用 .更多还原

【Abstract】 In order to analyse the reliability of ship structural systems with uncertainties including sectional area, length, module, strength of structural members, and loads applied, they are assumed to be subjected to the statistical law and be random variables. So the limit condition equation established is a nonlinear faction with random variables,some of which variables, e.g. displacement, are difficult to be expressed in the form of explicit formula. The improved first_order second_moment method and the stochastic finite element method are used to work out the system probability of failure for improvement of computational precision.This method is easy and reasonable, highly reliable and suitable for engineering application.更多还原