非线性波浪载荷作用下的船体结构疲劳损伤  

Fatigue Damage of Ship Structure under the Non-linear Wave Loading

作　　者：顾学康[1] 沈进威[1] 

机构地区：[1]中国船舶科学研究中心,无锡214082

出　　处：《船舶力学》2000年第5期22-35,共14页Journal of Ship Mechanics

摘　　要：近年来 ,在非线性波浪载荷(含砰击响应)作用下的船体结构疲劳损伤 ,已成为船舶力学研究和结构设计界颇为关注的一个前沿论题。本文以具有大外飘船舶为背景 ,采用谱分析法首先在短期预报范围内分析非线性波浪弯矩、非线性合成弯矩(含砰击振动弯矩)对船体结构疲劳损伤的影响 ;然后 ,在设定的船舶长期使用环境中 ,用不同的载荷理论估计和分析结构的疲劳损伤 ;同时计算分析了平均应力、二种计数法、不同长期疲劳损伤分析方法、二种S-N曲线、不同海浪资料以及船体刚度和结构振动阻尼对疲劳损伤的影响 ;最后为船舶结构疲劳分析法提出了一些指导性意见。This topic about the fatigue damage of ship structure under the loading of non-linear wave-induced bending moment,including whipping response,has been a popular project,which has been specially attended to by the community of research and design in recent years. In this paper first,using the method of spectrum analysis the effects of the non-linear wave-induced bending moment and combined bending moment on the fatigue damage of ship structure in short-term prediction with very large flare ship are presented.Second,using the various load theory the fatigue damage is estimated and analyzed in the given environment of long-term.Meanwhile,the effects of the mean and two kinds of counting of the stress history,the different methods to analyze the fatigue damage in long-term,two kinds of S-N curve,the different wave data,the rigidity and vibration damping of ship girder are calculated and analyzed.At last,some views of guidance about the analysis method of structure fatigue are provided.

关 键 词：非线性波浪载荷 疲劳损伤 船体结构 谱分析法 

分 类 号：U661.4[交通运输工程—船舶及航道工程] U663.2[交通运输工程—船舶与海洋工程]