钢悬链线立管截断模型设计

Design of truncated model for steel catenary riser

针对有限实验条件下建立超大长细比特征的海洋立管仿真模型存在的诸多问题,引用了深海平台系泊线系统最新的混合实验方法,通过Matlab和Mathematic软件对截断模型的弹性模量、轴向刚度及单位长度质量等特征参数进行优选,建立了合理的钢悬链线立管截断模型。通过有限元模拟对立管的全水深模型和截断模型进行力学特性对比分析,结果表明:截断模型的力学特性与全水深模型的力学特性相似,截断模型的计算结果准确。结合正态相似原理,可以得到适用于室内的小尺寸物理模型,为在有限实验条件下进行模型仿真实验提供了理论支撑。

Due to the limited experimental conditions, the establishment of the simulation model for the marine riser with super slenderness ratio is faced with many difficulties. In this paper, the latest hybrid experiment method for the mooring system of deepwater platform was introduced. Then, the characteristic parameters of truncated model were optimized by Matlab and Mathematic, e.g. elastic modulus, axial stiffness and mass per unit length, and a reasonable truncated model for steel catenary riser was established. Finally, the mechanical behavior of full water depth model was compared with that of truncated model by means of finite element simulation. It is indicated that the mechanical behavior of truncated model is similar to that of full water depth model and the calculation result of truncated model is accurate. Combined with the normal similarity principle, the small-scale physical model suitable for lab research can be established. The research results provide the theoretical support for the simulation experiment in the limited experimental conditions.