大尺度异形镂空浮体疲劳强度分析方法研究
Research on fatigue strength analysis method for large scale special-shaped hollow floating structure
张书友 1冷述栋 2常新江 3全博伦1
作者信息
- 1. 哈尔滨工程大学烟台研究院,山东烟台 264000
- 2. 中船重工船舶设计研究中心有限公司,北京 100081;大连理工大学能源与动力学院,辽宁大连 116024
- 3. 中船重工船舶设计研究中心有限公司,北京 100081
- 折叠
摘要
海洋环境复杂多变,海上结构物需要长期承受随机波浪引起的交变载荷,极易产生疲劳破坏.本文以某海上大尺度异型镂空浮体为研究对象,通过计算分析找出异形浮体结构容易产生疲劳破坏的位置.为使结构疲劳谱分析计算结果更加准确,本文提出一种数值规则波模拟法,用来计算浮体结构在工作时应力的传递函数.在此基础上,分别采用基于热点应力与名义应力的谱分析方法计算浮体的疲劳寿命.结果显示,基于热点应力法得到的结构疲劳寿命略低于基于名义应力法得到的疲劳分析结果,更偏保守.研究结果可以为大型海上浮式结构的设计提供参考.
Abstract
The marine environment is complex and changeable,and offshore structures need to bear the alternating load caused by random waves for a long time,which is very easy to cause fatigue damage.In this paper,a large-scale special-shaped hollow floating structure is taken as the research object,and the location where the structure is prone to fatigue fail-ure is found through calculation and analysis.In order to make the results of structural fatigue spectrum analysis more accur-ate,a numerical regular wave simulation method is proposed to calculate the transfer function of structural stress.On this basis,the fatigue life of the floating structure is calculated by using the spectrum analysis method based on hot spot stress and nominal stress respectively.The results show that the fatigue life of the structure based on hot spot stress method is slightly lower than that based on nominal stress method.The above research results can provide reference for the design of large offshore floating structures.
关键词
大尺度异形镂空浮体/数值规则波模拟法/热点应力/名义应力Key words
large scale special-shaped hollow floating structure/numerical regular wave simulation method/hot spot stress/nominal stress引用本文复制引用
出版年
2024
NETL
NSTL
万方数据