非金属柔性立管在海洋潮流下的动力响应特性研究  

Study on Dynamic Response Characteristics of Non-metallic Flexible Riser under Ocean Tidal Current

作　　者：姜振 赵林[1] JIANG Zhen;ZHAO Lin(College of Engineering,Ocean University of China,Qingdao 266100,China)

机构地区：[1]中国海洋大学工程学院,山东青岛266100

出　　处：《海洋技术学报》2021年第3期97-104,共8页Journal of Ocean Technology

基　　金：国家高技术研究发展计划资助项目(2013AA09A218)。

摘　　要：针对海洋柔性立管在服役期间,整体性能和运动响应受潮流影响较大的问题,本文在海上试验的基础上,采用OrcaFlex对长细比为448的非金属柔性立管模型进行了数值模拟。研究了潮流作用下,流速和流向的改变对于非金属柔性立管受力情况、涡激振动(VIV)响应特性和控制模态的影响。研究结果表明:潮流流向对立管顶张力、曲率和立管整体VIV响应有着显著影响,随着流速增加呈现不同变化规律。柔性立管悬垂段在高流速下更容易激发高阶模态,并呈现出明显的行波特性;立管的悬挂点和触底点为危险区域,随着流向改变易发生疲劳破坏。研究结果对海洋柔性立管总体布置设计具有参考意义。In order to solve the problem that the overall performance and motion response of marine flexible risers are greatly affected by the tidal current during the service period,this paper uses OrcaFlex to simulate the non-metallic flexible riser model with a slenderness ratio of 448 numerically based on the offshore test.Under the action of tidal current,the effects of changes in velocity and current direction on the stress,vortex-induced vibration(VIV)response characteristics and control modes of non-metallic flexible riser are studied.The research results show that the tidal current direction has a significant impact on the riser top tension,curvature and the overall VIV response of the riser,and presents different variation laws with the increase of current velocity.The suspension section of the flexible riser is easier to excite higher-order modes under high current velocity,and exhibits obvious traveling wave characteristics;the suspension point and touchdown point of the riser are dangerous areas,which are prone to fatigue failure as the current direction changes.The research results have reference significance for the overall layout design of marine flexible risers.

关 键 词：非金属柔性立管 涡激振动 潮流 流速 流向 OrcaFlex 

分 类 号：P756[天文地球—海洋科学]