基于并行计算的海洋平台谱分析疲劳筛选技术研究
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摘要
为了得到海洋平台疲劳失效风险最大的焊接区域,提出了以有限元网格单元应力为基础的谱分析筛选方法,并开发了程序。程序采用并行计算架构,单次完成数万个单元的累积损伤度/疲劳寿命计算,并通过有限元软件以云图方式显示疲劳寿命。采用该程序计算双浮筒半潜式平台的疲劳寿命。结果表明,该型平台疲劳失效风险较高的区域为立柱与上壳体下浮体连接对角线转角区域、浮筒中纵舱壁与立柱连接区域。并行计算方法的引入,大大缩减疲劳损伤度计算的分析时间,采用22核心的CPU,时间缩短为原来的1/18.5,17小时完成全平台外壳单元谱分析计算。
In order to obtain the welding area with the greatest risk of fatigue failure on the offshore platforms,a method of spectral analysis and screening based on the stress of finite element was proposed,and a program was developed. The parallel computing architecture was used to calculate the cumulative damage/fatigue life of tens of thousands of units at one time,and the fatigue life was visually displayed in a color chart way by using FEM software. The program was used to calculate the fatigue life of the double pontoon semi-submersible unit. The results show that the areas with high risk are the corner area on the diagonal line where the columns are connected to the pontoon/the upper hull,and the area where the longitudinal bulkhead of pontoon is connected to the columns. The parallel computation method greatly reduced the time of fatigue calculation analysis,with 22 core CPU,using a shorter time period( 1/18.5 of the original) of 17 hours to finish spectrum analysis and calculation of the whole platform out shell elements.
In order to obtain the welding area with the greatest risk of fatigue failure on the offshore platforms,a method of spectral analysis and screening based on the stress of finite element was proposed,and a program was developed. The parallel computing architecture was used to calculate the cumulative damage/fatigue life of tens of thousands of units at one time,and the fatigue life was visually displayed in a color chart way by using FEM software. The program was used to calculate the fatigue life of the double pontoon semi-submersible unit. The results show that the areas with high risk are the corner area on the diagonal line where the columns are connected to the pontoon/the upper hull,and the area where the longitudinal bulkhead of pontoon is connected to the columns. The parallel computation method greatly reduced the time of fatigue calculation analysis,with 22 core CPU,using a shorter time period( 1/18.5 of the original) of 17 hours to finish spectrum analysis and calculation of the whole platform out shell elements.
引文
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[3]谢文会,谢彬.深水半潜式钻井平台简化疲劳分析[J].海洋工程,2010,28(2):37-43.(XIE Wenhui,XIE Bin. Simplified fatigue assessment for deepwater semi-submersible rig[J]. The Ocean Engineering,2010,28(2):37-43.(in Chinese))
[4] LIU B,WANG J,ZHONG W J,et al. Liuhua 11-1 FPS dry-dock upgrader and life extension-fatigue assessment challenges and solutions[C]//OTC 24094. 2013:1-10.
[5] Watsamon Sahasakkul,Amir Arablouei,Ali Sari. Genesis. Comparison of fatigue calculations methods for structural integrity assessment of offshore structures[C]//OTC-27216-MS. 2016:1-10.
[6]李洛东,刘成名,梁园华,等.子模型法在半潜式平台疲劳谱分析中的应用[J].船海工程,2014,43(6):150-153.(LI Luodong,LIU Chengming,LIANG Yuanhua,et al. Application of sub-model method in spectral-based fatigue analysis of semisubmersible unit[J]. Ship&Ocean Engineering,2014,43(6):150-153(in Chinese))
[7] AHMADI H,LOTFOLLAHI-YAGHIN M A. Effect of SCFs on S-N based fatigue reliability of multi-planar tubular DKT-joints of offshore jacket-type structures[J]. Ships and Offshore Structures,2013,8(1):55-72.
[8] MUHAMMED A,STACEY A. Probabilistic S-N fatigue assessment methods for weld joints in offshore structures[C]//Proceedings of the 27thInternational Conference on Offshore Mechanics and Arctic Engineering. American Society of Mechanical Engineers,2008:335-354.
[9] A GHOLIZAD,A A GOLAFSHANI,V AKRAMI. Structural reliability of offshore platforms considering fatigue damage and different failure scenarios[J]. Ocean Engineering,2012(46):1-8.
[10]梁园华,杨清峡,闫小顺,等.老龄半潜式钻井平台节点疲劳裂纹扩展寿命预报[J].海洋工程,2015,33(6):20-25.(LIANG Yuanhua,YANG Qingxia,YAN Xiaoshun,et al. Fatigue crack growth life prediction for a welded detail on an ageing semi-submersible platform[J]. The Ocean Engineering,2015,33(6):20-25(in Chinese))
[11]中国船级社,海洋工程结构物疲劳强度评估指南[S].北京:人民交通出版社,2014.(China Classification Society,Guidelines for fatigue strength assessment of offshore engineering structures[S]. Beijing:China Communications Press,2014.(in Chinese))
[12]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 Guoqing. Research on fatigue strength assessment method of ship structures[D].Harbin:Harbin Engineering University,2006.(in Chinese))
[13]中国船级社,海上移动平台入级规范[S].北京:人民交通出版社,2016.(China Classification Society,Rules for classification of mobile offshore units[S]. Beijing:China Communications Press,2016.(in Chinese))