目的 研究悬挂区域的模拟方法对非黏合柔性立管动力响应和疲劳损伤的影响,并给出选择建议。方法 首先,分别采用OrcaFlex软件中的附件和line接触功能,建立传统方法（简称“ATM法”）和管中管方法（简称“PIP法”）的计算模型,并对模型进行验证,确保结果真实可信。然后,分别采用2种方法对某柔性立管进行分析,对比立管的弯曲响应和疲劳损伤,明确结果出现差异的原因。结果 在恶劣海况下,ATM法和PIP法得到的最大曲率很接近,但在温和海况下结果相差极大。针对所选海况,采用PIP法时,目标立管的最大曲率可以达到ATM法的7倍。无论是恶劣海况还是温和海况,PIP法得到的最大曲率范围均比ATM法有所增大。对于文中算例,增大比例可达20%以上。立管的疲劳损伤与其曲率范围正相关,采用PIP法时目标立管的最大损伤较ATM法增大了26.2%。结论 ATM法的结果并非总是偏于保守,建议采用PIP法对悬挂区域进行模拟,不但能够准确计算立管的响应,也有助于限弯器的设计。
Abstract
The work aims to study the effect of hang-off modelling method on the dynamic response and fatigue damage of unbonded flexible risers and provide selection recommendations. Firstly, the attachment and line contact functions in OrcaFlex were used to establish the calculation models for the traditional method (referred to as “ATM method”) and the pipe-in-pipe method (referred to as “PIP method”), respectively. Then, the models were verified to ensure that the results were authentic. Next, the two methods were adopted to analyze some certain flexible riser and the dynamic response and fatigue damage of the riser were compared to identify the difference in results. The maximum curvatures from the ATM method and the PIP method were close under the severe sea state, but exhibited significant difference under the mild sea state. According to the selected sea state, the maximum curvature of the target riser obtained from the PIP method was 7 times that from the ATM method. However, the maximum curvature range from the PIP method was always larger than that from the ATM method, no matter under the severe or mild sea state, and a proportion of more than 20% was observed in the case study. The fatigue damage of the riser was positively correlated with its curvature range. The maximum damage from the PIP method increased by 26.2% compared with that from the ATM method. Given that the ATM method does not always give the results on the conservative side, it is recommended to use the PIP method to model the hang-off region of flexible risers. The use of the PIP method not only predicts the riser response accurately, but also helps the design of bend stiffeners.
关键词
非黏合柔性立管 /
悬挂区域 /
限弯器 /
曲率 /
曲率范围 /
疲劳损伤
Key words
unbonded flexible riser /
hang-off region /
bend stiffener /
curvature /
curvature range /
fatigue damage
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