深海悬链线立管涡激疲劳损伤研究  

Study on VIV induced fatigue damage for SCR in deep sea

作　　者：周力[1] 周巍伟[1] 曹静 高云[1] 宗智[3] 

机构地区：[1]大连理工大学运载工程与力学学部,辽宁大连116024 [2]中海石油研究中心,北京100027 [3]工业装备结构分析国家重点实验室,辽宁大连116024

出　　处：《海洋工程》2010年第1期36-41,共6页The Ocean Engineering

基　　金：创新研究体科学基金资助项目(50921001);973资助项目(2010CB832700)

摘　　要：讨论海洋平台钢质悬链线式立管SCR(Steel Catenary Riser)的涡激疲劳损伤问题。对于悬链线立管外的流体,给出涡脱落频率和升力对立管作用的计算方法。悬链线立管采用索结构模型,进行动力学分析并利用模态叠加法对其进行动力响应分析。根据Palmgren-Miner线性累积损伤准则并结合S-N曲线,分析在不同流速下立管的涡激疲劳损伤。以工程中实际使用的1 500 m Spar海洋平台悬链线立管为例,对立管的涡激疲劳损伤进行了预报。并通过立管的参数研究,分别就立管外不同来流速度、立管壁厚、内部流体密度和柔性接头刚度对其疲劳损伤的影响进行了分析,得到了一些有意义的研究结果。The fatigue damage of the offshore platform SCR （Steel Catenary Riser） induced by the short term current is discussed. For the fluid around the SCR, the vortex shedding frequency and the lift are considered. The SCR is modelled as a cable. The dynamic response of the SCR is studied using modal superposition method. The riser＇s VIV（Vortex Induced Vibration） damage subject to different current is investigated by combining Palmgren-Miner liner cumulative rule and S-N curve. A 1,500 m Spar Platform-Riser system of engineering is studied, and the SCR VIV induced fatigue damage is predicted. Furthermore, the effect of some parameters on the fatigue damage, such as inflow velocity toward the riser, riser wall thickness, fluid density inside the riser and the stiffness of flex joint, is studied. Some useful results are obtained for offshore engineering.

关 键 词：悬链线式立管 涡激疲劳损伤 来流速度 立管壁厚 流体密度 柔性接头 

分 类 号：P751[交通运输工程—港口、海岸及近海工程]