新型深水绷紧式系泊系统动力特性分析
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摘要
通过对工作水深为1 500 m的新型绷紧式系泊系统中单根系缆进行动刚度和动张力计算,并与静刚度下计算结果比较,说明了在合成纤维系缆数值计算中考虑其动刚度特性的必要性;传统动刚度计算中将整条系缆作为直线考虑,假定系缆上的应力和应变处处相同,不考虑系缆自身重量,且忽略流体动力作用,这些假设和忽略降低了计算精度;基于集中质量法建立了系缆的动力学模型,提出采用分段动刚度方法通过迭代计算各缆段上的动刚度和动张力,并考虑了系缆自身重量、流体动力和海流等因素的影响;由于传统方法中取预张力作为平均张力计算会降低精度,于是提出基于统计的方法计算各缆段的平均张力,并用于该缆段动刚度的计算。该研究对于绷紧式系泊系统的数值分析和工程应用具有重要的意义。
Taking a spar platform operated in 1 500 m water depth as an example, the dynamic stiffness and tension of a single cable in new type taut-wire mooring system are calculated. Through comparing of the results with that of using static stiffness, the necessity of taking into account of the dynamic stiffness property is indicated when calculating the synthetic fiber mooring lines. In traditional dynamic stiffness calculation, it is assumed that the tension and strain to be equal along the line, the line's weight was not taken into account, and the drag force was ignored, these assumptions and ignores declined the accuracy. Building up the mooring line's model based on lumped mass method, using sectional dynamics stiffness method to calculate the segments' dynamic stiffness and tension through iteration process, and line's weight, drag force and current's effect are all investigated. In traditional method, taking the pretension as mean load could decrease accuracy, and so the method that obtaining the mean load through averaging the recorded historical tension of a node is put forward, and using the average as mean load to calculate the sectional dynamic stiffness. The present work provides significant reference for the research and development and engineering application of taut-wire mooring systems.
Taking a spar platform operated in 1 500 m water depth as an example, the dynamic stiffness and tension of a single cable in new type taut-wire mooring system are calculated. Through comparing of the results with that of using static stiffness, the necessity of taking into account of the dynamic stiffness property is indicated when calculating the synthetic fiber mooring lines. In traditional dynamic stiffness calculation, it is assumed that the tension and strain to be equal along the line, the line's weight was not taken into account, and the drag force was ignored, these assumptions and ignores declined the accuracy. Building up the mooring line's model based on lumped mass method, using sectional dynamics stiffness method to calculate the segments' dynamic stiffness and tension through iteration process, and line's weight, drag force and current's effect are all investigated. In traditional method, taking the pretension as mean load could decrease accuracy, and so the method that obtaining the mean load through averaging the recorded historical tension of a node is put forward, and using the average as mean load to calculate the sectional dynamic stiffness. The present work provides significant reference for the research and development and engineering application of taut-wire mooring systems.
引文
[1]连宇顺,刘海笑,黄维.超深水混合缆绷紧式系泊系统非线性循环动力分析[J].海洋工程,2013,3:1-7.Lian Yushun,Liu Haixiao,Huang Wei.Cyclic nonlinear analysis of ultra-deepwater hybrid mooring systems[J].Ocean Engineering,2013,3(31):1-7.
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[8]Fran觭ois M,Davies P.Characterization of polyester mooring lines[C].American Society of Mechanical Engineers,2008:169-177.
[9]刘海笑,黄泽伟.新型深海系泊系统及数值分析技术[J].海洋技术,2007,26(2):6-10.Liu Haixiao,Huang Zewei.A new type deep-water mooring system and numerical analytical techniques[J].Ocean Technology,2007,26(2):6-10.
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[11]张火明,洪文渊,王强,等.纤维系缆动刚度特性研究[J].船舶,2014(2):26-32.Zhang Huoming,Hong Wenyuan,Wang Qiang,et al.Investigation on dynamics stiffness of fiber cables[J].Ship&Boat,2014(2):26-32.
[12]Walton T S,Polachek H.Calculation of transient motion of submerged cables[J].Mathematics of Computation,1960,14(69):27-46.
[13]Thomas D O.A numerical investigation of time integration schemes applied to dynamic solution of mooring lines[D].University of Newcastle Upon Tyne,1993.
[14]Chai Y T,Varyani K S,Barltrop N D P.Three-dimensional lump-mass formulation of a catenary riser with bending,torsion and irregular seabed interaction effect[J].Ocean Engineering,2002,29(12):1503-1525.
[15]王飞.海洋勘探拖曳系统运动仿真与控制技术研究[D].上海:上海交通大学,2006.Wang Fei.Simulation and control research of marine towed seismic system[D].Shanghai:Shanghai Jiao Tong University,2006.
[16]王飞,黄国樑,刘天威.规则波作用下水下拖缆数值分析研究[J].海洋工程,2006,24(1):92-97.Wang Fei,Huang Guoliang,Liu Tianwei.Dynamic study of towed cable in regular waves[J].Ocean Engineering,2006,24(1):92-97.
[17]王飞.各向异性弯矩扭矩作用下导流缆运动建模与仿真[J].哈尔滨工程大学学报,2013,34(5):549-554.Wang Fei.Modeling and simulation of faired cable with anisotropic bending moment and torque[J].Journal of Harbin Engineering University,2013,34(5):549-554.
[18]王飞,黄国樑.导流缆拖曳系统准动态运动建模及仿真[J].上海交通大学学报(自然版),2012,46:1658-1664.Wang Fei,Huang Guoliang.Semi-dynamic modeling and simulation study of underwater faired cable[J].Journal of Shanghai Jiao Tong University,2012,46:1658-1664.
[19]Ablow C M,Schechter S.Numerical simulation of undersea cable dynamics[J].Ocean Engineering,1983,10(6):443-457.
[20]Huang Shan.Dynamic analysis of three-dimensional marine cables[J].Ocean Engineering,1994,21(6):587-605.
[2]Del Vecchio C J M.Light weight materials for deep water moorings[D].University of Reading,1992.
[3]Bosman R,Hooker J.The elastic modulus characteristics of polyester mooring ropes[C].Offshore Technology Conference,1999.
[4]Casey N F,Belshaw R,Paton A G,et al.Short and long-term property behaviour of polyester rope[C].Offshore Technology Conference,2000.
[5]Casey N F,Banfield S J.Full-scale fiber deepwater mooring ropes:advancing the knowledge of spliced systems[C].Offshore Technology Conference,2002.
[6]Kim M S.Dynamic simulation of polyester mooring lines[D].Citeseer,2004.
[7]Tahar A,Kim M H.Coupled-dynamic analysis of floating structures with polyester mooring lines[J].Ocean Engineering,2008,35(17):1676-1685.
[8]Fran觭ois M,Davies P.Characterization of polyester mooring lines[C].American Society of Mechanical Engineers,2008:169-177.
[9]刘海笑,黄泽伟.新型深海系泊系统及数值分析技术[J].海洋技术,2007,26(2):6-10.Liu Haixiao,Huang Zewei.A new type deep-water mooring system and numerical analytical techniques[J].Ocean Technology,2007,26(2):6-10.
[10]黄泽伟.新型深海系泊系统及数值分析技术[D].天津:天津大学,2006.Huang Zewei.A new type deep-water mooring system and numerical analytical techniques[D].Tianjing:Tianjing University,2006.
[11]张火明,洪文渊,王强,等.纤维系缆动刚度特性研究[J].船舶,2014(2):26-32.Zhang Huoming,Hong Wenyuan,Wang Qiang,et al.Investigation on dynamics stiffness of fiber cables[J].Ship&Boat,2014(2):26-32.
[12]Walton T S,Polachek H.Calculation of transient motion of submerged cables[J].Mathematics of Computation,1960,14(69):27-46.
[13]Thomas D O.A numerical investigation of time integration schemes applied to dynamic solution of mooring lines[D].University of Newcastle Upon Tyne,1993.
[14]Chai Y T,Varyani K S,Barltrop N D P.Three-dimensional lump-mass formulation of a catenary riser with bending,torsion and irregular seabed interaction effect[J].Ocean Engineering,2002,29(12):1503-1525.
[15]王飞.海洋勘探拖曳系统运动仿真与控制技术研究[D].上海:上海交通大学,2006.Wang Fei.Simulation and control research of marine towed seismic system[D].Shanghai:Shanghai Jiao Tong University,2006.
[16]王飞,黄国樑,刘天威.规则波作用下水下拖缆数值分析研究[J].海洋工程,2006,24(1):92-97.Wang Fei,Huang Guoliang,Liu Tianwei.Dynamic study of towed cable in regular waves[J].Ocean Engineering,2006,24(1):92-97.
[17]王飞.各向异性弯矩扭矩作用下导流缆运动建模与仿真[J].哈尔滨工程大学学报,2013,34(5):549-554.Wang Fei.Modeling and simulation of faired cable with anisotropic bending moment and torque[J].Journal of Harbin Engineering University,2013,34(5):549-554.
[18]王飞,黄国樑.导流缆拖曳系统准动态运动建模及仿真[J].上海交通大学学报(自然版),2012,46:1658-1664.Wang Fei,Huang Guoliang.Semi-dynamic modeling and simulation study of underwater faired cable[J].Journal of Shanghai Jiao Tong University,2012,46:1658-1664.
[19]Ablow C M,Schechter S.Numerical simulation of undersea cable dynamics[J].Ocean Engineering,1983,10(6):443-457.
[20]Huang Shan.Dynamic analysis of three-dimensional marine cables[J].Ocean Engineering,1994,21(6):587-605.