船体结构疲劳可靠性分析的直接计算方法  

Direct calculation approach for fatigue reliability analysis of ship structures

作　　者：甄春博[1] 王天霖[1] 于鹏垚 ZHEN Chunbo;WANG Tianlin;YU Pengyao(College of Traffic Equipment and Ocean Engineering,Dalian Maritime University,Dalian 116026,China)

机构地区：[1]大连海事大学交通运输装备与海洋工程学院,辽宁大连116026

出　　处：《哈尔滨工程大学学报》2018年第4期664-667,共4页Journal of Harbin Engineering University

基　　金：国家重点研发计划重点专项(2016YFC0301500);国家自然科学基金项目(51379025;51609031);海洋工程国家重点实验室开放基金项目(1513);中央高校基本科研业务费专项资金项目(3132016346);辽宁省博士启动基金项目(201601070)

摘　　要：针对船体结构疲劳寿命预报的可靠性问题,采用三维势流理论和整船有限元分析的谱分析直接计算方法,得到各短期海况和长期海况的应力参数,给出整个寿命期总的疲劳累积损伤。考虑疲劳分析时涉及的诸多不确定性因素,得出船体结构的疲劳寿命可靠性指标及可靠度,从而给出基于直接计算的船体结构疲劳可靠性分析方法。以高性能三体船疲劳可靠性的算例分析表明,疲劳寿命可靠度随着疲劳寿命的增加而增大,在疲劳问题严重区域较小。To accurately predict the fatigue life of a ship structure,3D linear potential flow theory and a direct calculation method based on the spectral analysis used for the finite element analysis of an entire ship were adopted.The stress parameters of short-term and long-term sea states were obtained,and the cumulative fatigue damage of the ship during its entire life period was given.The uncertainties involved in fatigue analysis were considered;the reliability index of the hull structure was obtained,and the fatigue reliability analysis of the ship structure was presented based on direct calculation.In this study,the fatigue reliability of a high-performance trimaran was analyzed.The results of this analysis reveal that the fatigue life reliability increases with an increase in the fatigue life,and it is low in areas with serious fatigue.

关 键 词：直接计算 疲劳可靠性 谱分析法 船体结构 三维势流理论 整船有限元分析 应力参数 

分 类 号：U661.43[交通运输工程—船舶及航道工程]