瞬变潮汐流对单锚摇臂系泊系统大幅度回转运动的影响
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摘要
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 parameters of Floating Production Storage and Offloading(FPSO)are calculated based on 3 Dpotential 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)coefficients 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 rotational motion of SAL yoke system under transient tidal current with large change of flow direction 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.
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 parameters of Floating Production Storage and Offloading(FPSO)are calculated based on 3 Dpotential 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)coefficients 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 rotational motion of SAL yoke system under transient tidal current with large change of flow direction 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.
引文
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[14]中国海洋石油总公司.Model Test Reports of SAL Yoke System[R].2000.
[2]胡楠.FPSO单锚摇臂系泊系统的非线性动力特性研究[D].天津:天津大学,2006.
[3]张宝雷.FPSO水下软钢臂单点系泊系统刚度特性浅析[J].资源节约与环保,2012(05):113-116.
[4]李淑一,王树青.基于多体分析的浅水FPSO和水下软钢臂系泊系统运动特性研究[J].中国海洋大学学报:自然科学版,2011,41(09):95-102.
[5] YATES M L,BENOIT M.Accuracy and Efficiency of Two Numerical Methods of Solving the Potential Flow Problem for Highly Nonlinear and Dispersive Water Waves[J].International Journal for Numerical Methods in Fluids,2015,77(10):610-640.
[6]刘应中,缪国平.船舶在波浪上的运动理论[M].上海:上海交通大学出版社,1987.
[7]戴遗山.舰船在波浪中运动的频域与时域势流理论[M].北京:国防工业出版社,1998.
[8] FALTINSEN O M.Sea Loads on Ships and Offshore Structures[M].UK:Cambridge University Press,1990.
[9]肖龙飞,杨建民,胡志强.极浅水单点系泊FPSO低频响应分析[J].船舶力学,2010,14(04):372-378.
[10]方子帆,贺青松,向兵飞,等.低张力缆索有限元模型及其应用[J].工程力学,2013,30(03):445-450.
[11]中国船级社.海上单点系泊装置入级与建造规范[S].北京:人民交通大学出版社,1996.
[12]赵军凯,谭耀模,张武奎,等.海洋石油112号FPSO建造、安装和调试期间的项目管理[J].海洋石油,2007,27(02):109-112.
[13]王春升.渤海曹妃甸11/渤中25-1油田FPSO新型单点介绍[J].中国造船,2006,47(S):9-13.
[14]中国海洋石油总公司.Model Test Reports of SAL Yoke System[R].2000.