瞬变潮汐流对单锚摇臂系泊系统大幅度回转运动的影响

Effect of Transient Tidal Current on Rotational Performance of SAL Yoke System

为了研究瞬变潮汐流产生的单锚摇臂系统大幅度回转问题,针对单锚摇臂系统的特点建立水下摇臂和连接锚链的系泊模型。进一步基于三维波浪势流理论计算浮式生产储卸装置(Floating Production Storage and Offloading,FPSO)的水动力参数,在时域内耦合分析稳态环境载荷作用下的FPSO-chain-yoke多体运动特性,并且与模型试验数据进行对比,验证了算法的准确合理性。在此基础上,对不同角度的FPSO风(流)载荷系数进行样条插值分段得到其与迎风(流)角度的关系表达式。结合单点系泊系统的风向标效应,实现对瞬变潮汐流问题的求解,重点讨论了大角度方向变化的潮汐流对单锚摇臂系泊系统回转运动的影响。通过与实际观测数据进行对比,验证了算法的工程应用价值,以期能够为探究单锚摇臂系统运动和轴承磨损行程提供研究方法和理论依据。

In order to study the problem of large rotation of Single Anchor Loading （SAL） yoke system due to transient tidal current, the mooring models with underwater yoke and chain are proposed for the characteristics of SAL yoke system. The hydrodynamic para- meters of Floating Production Storage and Offloading （FPSO） are calculated based on 3D po- tential wave theory. The coupling analysis on the motion performance of multi-body system is taken under various environmental loads in time domain, which is validated by comparing with the experimental data of model test. On this basis, according to the wind （current） coeffi- cients of various directions, the expression between the coefficients and angles can be deduced in the form of spline interpolation. For the vane effect of single point mooring system, the ro- tational motion of SAL yoke system under transient tidal current with large change of flow di- rection is analyzed. Compared with the practically observed data, the accuracy and rationality of numerical scheme are validated to provide technical support for rotational motion perform-ance and bearing wear of SAL yoke system.