大连海事大学学报 >
2018 , Vol. 44 >Issue 1: 41 - 47
DOI: https://doi.org/10.16411/j.cnki.issn1006-7736.2018.01.007
宽带随机载荷下船舶结构的两种疲劳直接计算方法
收稿日期: 2017-06-05
修回日期: 2017-08-01
网络出版日期: 2017-08-01
基金资助
中央高校基本科研业务费专项资金资助项目(3132016339).
Two direct fatigue calculation methods for ship structures under broadband random loading
Received date: 2017-06-05
Revised date: 2017-08-01
Online published: 2017-08-01
针对船舶疲劳计算将外载荷以及波浪引起的船舶交变应力响应过程当窄带模型处理，而现实海况模型更接近宽带模型这一问题，考虑从应力范围分布为切入点，以实船结构为研究对象，采用两种直接计算法——HCSR直接计算方法和谱分析方法解决宽带随机载荷下的疲劳计算问题.谱分析法以Rice分布为基础，建立宽带载荷下等效应力范围的近似计算模型进行疲劳求解；而HCSR直接计算方法则用连续型模型Weibull分布来表示宽带谱下应力范围的分布模型，从而解决宽带随机载荷下求解疲劳寿命问题.研究结果表明：考虑宽带影响因素后，两种方法虽然采用模型不同，但结果相接近或趋势相同，证明两种方法对解决宽带下疲劳问题都有一定可行性；但谱分析法求解时采用多种等效应力近似模型，可满足不同带宽下的疲劳强度计算，结果更加准确可信.
关键词： 宽带随机载荷; HCSR直接计算方法; 谱分析; 应力范围; 近似计算模型
周陈炎 , 张佳宁 , 申亚洲 , 张天逸 . 宽带随机载荷下船舶结构的两种疲劳直接计算方法[J]. 大连海事大学学报, 2018 , 44(1) : 41 -47 . DOI: 10.16411/j.cnki.issn1006-7736.2018.01.007
In view of the problem that the alternative stress responses resulted from external load and waves loads were treated as a narrow band model in fatigue calculation process, while the actual sea state model was closer to a broadband mode, and the stress range distribution was considered as the breakthrough point, taking the real ship structure as the study object, the fatigue problems were resolved by using two direct calculation methods—HCSR and spectral analysis method under broadband random loads. For spectrometry based on Rice distribution, the approximate model of the equivalent stress range was set up under broadband loads. For direct calculation method based on HCSR, a continuous model—Weibull model was used to represent the stress range distribution model under broadband spectrum to solve the fatigue problem under broadband random loads. Results show that considering the influence of broadband factors, two kinds of methods while using different models, but the results are close to or the same trend, which prove that the two methods have certain feasibility to solve the fatigue problem of broadband, but spectral analysis method using a variety of equivalent stress model to calculate the fatigue strength under different bandwidth, therefore the results are more accurate and reliable.
[1]伍义生.窄带和宽带随机载荷下的疲劳寿命估算[J]. 固体力学学报,1992,13(4):322-329.
WU Yi-sheng.Fatigue life estimation under narrow band and broad band random loading[J].Acta Mechanica Solida Sinica,1992,13(4):322-329.(in Chinese)
[2]吕彭民.宽带随机载荷谱下结构疲劳寿命的计算[J]. 长安大学学报(自然科学版),2004,24(1):76-78.
LÜ Peng-ming.Calculation of structural fatigue life under broad band random loading spectrum[J].Journal of Chang’an University(Natural Science Edition),2004,24(1):76-78.(in Chinese)
[3]KAM J C P.Recent development in the fast corrosion fatigue analysis of offshore structures subject to random wave loading[J].International Journal of Fatigue,1990,12(6):458-468.
[4]吕澎民,赵邦华,严隽耄.宽带随机谱下一种实用的等效应力计算模型[J].甘肃工业大学学报,1996,22(3):75-82.
LU Peng-ming,ZHAO Bang-hua,YAN Jun-mao.A practical model of equivalent stress range calculation under broad band random loading[J].Journal of Gansu University of Technology,1996,22(3):75-82.(in Chinese)
[5]CHAUDHURY G K,DOVER W D.Fatigue analysis of offshore platforms subject to sea wave loading[J].International Journal of Fatigue, 1985,7(1):13-19.
[6]CHOW C L,LI D L.An analytical solution for fast fatigue assessment under wide-band random loading[J].International Journal of Fatigue,1991,13(5):395-404.
[7]SARKANI S.Influence of high-frequency compnents on fatigue of welded joints[J].International Journal of Fatigue,1990,12(2):115-120.
[8]李晓飞,胡毓仁.宽带波浪载荷下海洋结构物内应力范围及疲劳损伤分析[J].海洋工程,2008,26(4):35-38.
LI Xiao-fei,HU Yu-ren.Short-time distribution of stress ranges in ship and ocean structures under wide band wave loads and fatigue damage[J].The Ocean Engineering,2008,26(4):35-38.(in Chinese)
[9]张立军.宽带随机载荷下的疲劳寿命统一模型[J].振动、测试与诊断,2014,34(6):1022-1026.
ZHANG Li-jun.Unified model of fatigue life under wide-band random load[J].Journal of Vibration ,Measurement & Diagnosis,2014,34(6):1022-1026.(in Chinese)
[10]IACS.Common structural rules for bulk carriers and oil tankers[EB/OL].(2015-01-01)[2017-06-05]. http://www.iacs.org.uk/publications/common-structural-rules/csr-for-bulk-carriers-and-oil-tankers/.
[11]冯国庆.船舶结构疲劳强度评估方法研究[D].哈尔滨:哈尔滨工程大学,2006.
FENG Guo-qing.Research on fatigue strength assessment method of ship structures[D].Harbin:Harbin Engineering University,2006.(in Chinese)
/
| 〈 |
|
〉 |