Fatigue Characteristic Analysis of Deepwater Steel Catenary Risers at the Touchdown Point     

傅俊杰  杨和振 《中国海洋工程》2010,24(2):291-304

This paper presents fatigue characteristic analysis of a deepwater steel catenary riser (SCR) under ambient excitations. The SCR involves complex nonlinear dynamic behaviors, especially at the touchdown point (TOP) where the riser first touches the seafloor. Owing to the significant interaction with soil, the touchdown zone is difficult to be modeled. Based on Lumped-Mass method and P-y curve, nonlinear springs are used to simulate the SCR-seabed coupled interaction. In case studies, an SCR's dynamic features have been obtained by transient analysis and the structure fatigue assessment has been carried out by S-N approach. The comparative analysis shows that the TOP is the key location where soil-riser interaction rises steeply and minimum fatigue life occurs. Parameters such as ocean environment loads, vessel motions, riser material and geometric parameters are discussed. The results indicate that the vessel motion is the principal factor for the structure fatigue lite distribution.  相似文献   

深海钢悬链立管触地点动力响应分析   总被引：1，自引：0，他引：1  

傅俊杰  杨和振 《海洋工程》2009,27(2):36-40

研究深海钢悬链立管(SCR)在海洋环境载荷作用下的动力响应.利用非线性弹簧模拟立管与海床触地点的耦合模型,通过模态分析得到钢悬链立管的动力特性参数;时域动力响应分析获得不同工况下触地点及典型部位的位移、弯矩和应力时程.比较分析表明:浮体垂荡运动对触地点的应力状态影响较大,触地点附近存在钢悬链立管动力响应过程中的位移极值点和弯矩极值点.所提方法为触地点区域模拟分析提供了新思路,给出的分析结论对钢悬链立管设计有一定借鉴意义.  相似文献   

带端部间隙的机翼绕流PIV测量     

李广年  郭欣  傅俊杰 《海洋工程》2010,28(2)

以带端部间隙的机翼绕流模拟泵喷推进器导管间隙流动,利用2D-PIV测试系统,选定PVC为示踪粒子,以透明二维机翼模型为研究对象,在小循环水槽中研究了间隙对叶片环量分布的影响。通过同步控制器控制CCD摄像及两激光器出光,有效解决激光器与CCD二者的同步控制与连续采集问题。每个截面均测量获得95幅瞬时速度矢量场,采用平均方法获得了同一截面下的平均速度场。给出了机翼不同截面处的流动情况,分析了机翼环量沿展向分布的规律。  相似文献