相关腐蚀与疲劳及维修对船体可靠性的影响  

Impact of Correlated Corrosion and Fatigue on Reliability of Maintained Ships

作　　者：江晓俐[1] 

机构地区：[1]武汉理工大学交通学院,武汉430063

出　　处：《武汉理工大学学报（交通科学与工程版）》2005年第3期363-366,共4页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：国家自然科学基金项目资助(批准号:10072043)

摘　　要：将腐蚀和疲劳作为非正态相关变量来处理,真实合理地反映了疲劳腐蚀间紧密的内部关联.采用渐进崩溃法计算船体总纵极限强度,将响应面法与传统可靠性计算方法相结合来进行船体总纵极限强度可靠性分析.利用Nataf转化原理获得随机变量当量正态化后新的相关因子.船舶维修对于可靠性的影响通过三种维修决策来实现:无修理,少量修理,更新.对一艘万吨散货船应用该方法进行了分析计算.通过与常规线性叠加方法比较表明,采用相关原理处理疲劳腐蚀间的相互作用是一个合理、有效且实用的方法.Corrosion and fatigue are two keys and correlated damages attributable to the degradation of existing ships.In the paper,both corrosion and fatigue are treated as non-normal random variables,which are in accordance with the reality.Progressive collapse method is used to calculate ship ultimate hull girder strength and the combination of surface response method and traditional method is utilized to analyse reliability.The new correlation coefficient after normalization is obtained by means of Nataf transformation.Protective maintenance is also considered in a structural reliability context with three repair decisions,i.e.do nothing,minimal repair and replacement.An example application for a bulk carrier is presented.A comparison study between proposed approach and traditional linear method indicates that the former is a reasonable and effective approach with practical value.Finally,the problems discovered in the study are stressed.

关 键 词：腐蚀 疲劳 维修 船舶 结构可靠性 

分 类 号：U661.4[交通运输工程—船舶及航道工程]