一种基于方向概率的潜艇结构可靠性计算方法  

Reliability Analysis of Submarine Structures Based on Directional Method

作　　者：吴亚舸[1] 吴剑国[2] 

机构地区：[1]同济大学土木工程学院建筑工程系,上海200000 [2]华东船舶工业学院,江苏镇江212003

出　　处：《船舶力学》2003年第1期84-93,共10页Journal of Ship Mechanics

摘　　要：潜艇结构可靠性分析属于多个相关模式串联的系统可靠性分析问题。本文通过随机空间的映射变换,将其多个失效模式的失效面统一变换到随机独立的标准正态空间(Gauss空间)内,以利用该空间球坐标沿其径向的x2分布特性计算总体失效域上的失效概率。由于无须进行模式间相关性的近似分析,因而提高了系统失效概率的计算精度。潜艇两种耐压结构的可靠性分析算例表明:该方法实用性强,操作性好,精度较高,对于有高度非线性失效面方程的可靠性计算问题有很强的适应性。The reliability analysis of submarine structures should be classified as series-system reliability problem with related failure modes.In this paper,all the failure surfaces are transferred into Gaussian Space by transforˉmation of random variable space,and thus the properties of chi-square-distribution in Gaussian Space can be utilized to calculate the failure probability in the total failure area.Because there is no need to determine the corˉrelation of failure modes approximately,the precision of analysis can be raised.Examples for two types of submarine structures indicate that this method is practical and useful,and is especially suitable for reliability analysis with highly non-linear failure surfaces.

关 键 词：结构可靠性 失效模式 串联结构系统 并联结构系统 圆柱壳 液舱 

分 类 号：U661.4[交通运输工程—船舶及航道工程]