基于改进响应面法的立管疲劳可靠性计算

发布时间：2018-05-23 12:35

本文选题：海洋立管 + 疲劳可靠性　；参考：《天津大学学报(自然科学与工程技术版)》2017年10期

【摘要】：基于现代断裂力学方法建立立管疲劳失效的极限状态函数.应用经典响应面法求解可靠性指标时,发现迭代过程会出现混沌或数值振荡现象.为避免可靠性指标计算过程中不收敛问题,引入混沌控制方法改进算法.研究表明改进的响应面法具有较好的适用性和收敛性.基于改进的响应面法重新计算立管的疲劳可靠性指标,有效解决了迭代不收敛问题,且计算结果具有较高精度.在此基础上,分析了随机变量变异系数对立管疲劳可靠性的影响.计算结果显示立管疲劳可靠性随随机变量变异系数的增大而减小,并且随机变量B变异系数对立管疲劳可靠性的影响最大.
[Abstract]:Based on the modern fracture mechanics method, the limit state function of fatigue failure of riser is established. When the classical response surface method is used to solve the reliability index, it is found that chaos or numerical oscillation will occur in the iterative process. In order to avoid the problem of non-convergence in the process of reliability index calculation, an improved chaos control algorithm is introduced. The results show that the improved response surface method has good applicability and convergence. Based on the improved response surface method, the fatigue reliability index of riser is recalculated, which effectively solves the problem of iteration non-convergence, and the calculation results have high accuracy. On this basis, the influence of the coefficient of variation of random variables on the fatigue reliability of pipe is analyzed. The results show that the fatigue reliability of riser decreases with the increase of variation coefficient of random variables, and the coefficient of variation B of random variable has the greatest influence on the fatigue reliability of risers.
【作者单位】：天津大学水利工程仿真与安全国家重点实验室;高新船舶与深海开发装备协同创新中心;
【基金】：国家重点基础研究发展计划(973计划)资助项目(2014CB046803) 国家自然科学基金资助项目(51239008)~~
【分类号】：TG142.12

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