In order to provide a theoretical guide for choosing the material for the hawsers for the FPSO side-by-side offloading system, which is moored by the yoke system, the 3D potential flow theory and full coupled time-dom...In order to provide a theoretical guide for choosing the material for the hawsers for the FPSO side-by-side offloading system, which is moored by the yoke system, the 3D potential flow theory and full coupled time-domain analysis are presented to study the dynamic response of the offloading system. The MingZhu FPSO offloading system in the field BZ25-1 is simulated here; and four different characteristic fiber ropes are used as the material for the hawsers. To acquire an accurate hawser line tension, the polynomial fitting method is used to calculate the nonlinear stiffness of the hawsers. By comparing the hawser lines＇ tension and the relative motion between the FPSO and the shuttle tanker, a suitable material for the hawser lines is chosen and discussed in this paper. The results indicate that the nonlinear stiffness characteristic of the fiber rope has a small effect on the relative motion of the vessels, but the hawser lines＇ tension is greatly influenced by the different characteristics of the fiber ropes. The hawser lines＇ tension with nonlinear stiffness is in accordance with the one with the upper and lower bound linear stiffness, which proves this method of fitting the fiber ropes＇ nonlinear stiffness is reasonable and reliable.展开更多
基于现有的渤海浮式生产储卸油装置(Floating Production Storage and Offloading,FPSO)实测数据,开展海洋核动力平台(Marine Nuclear Power Platform,MNPP)定位系统多体动力特性分析。建立MNPP定位系统的多刚体动力学模型,通过MNPP与...基于现有的渤海浮式生产储卸油装置(Floating Production Storage and Offloading,FPSO)实测数据,开展海洋核动力平台(Marine Nuclear Power Platform,MNPP)定位系统多体动力特性分析。建立MNPP定位系统的多刚体动力学模型,通过MNPP与渤海某FPSO的响应幅值算子(Response Amplitude Operator,RAO),计算FPSO船体实测数据与MNPP响应的比例系数;根据FPSO船体实测数据计算MNPP六自由度数据,并采用经验模态分解(Empirical Mode Decomposition,EMD)方法保留原始数据的波频成分,在此基础上计算定位系统的系泊回复能力和各铰节点的受力行为。通过与FPSO软刚臂系泊系统受力状态进行对比分析,验证MNPP定位系统在实测海况下设计的合理性。可为MNPP系泊结构设计和安全运行提供科学的分析手段。展开更多
The driving necessities of cost reduction and the need to develop fields at ever increasing water depths have led to the use of floating structures. Among these structures are the Floating Production Storage and Offlo...The driving necessities of cost reduction and the need to develop fields at ever increasing water depths have led to the use of floating structures. Among these structures are the Floating Production Storage and Offloading (FPSO) units whose motion analysis is considered in this paper. In actual environmental condition, it is required to accurately determine or predict large amplitude motion of the FPSO before any offshore operation. This paper seeks to present a detailed method of computing the Response Amplitude Operator(s) (RAOs) for the six (6) degrees of freedom using ANSYS AQWA. The results indicate for Heave motion a tendency for the heave peak value to move slightly higher dimensionless encounter-frequency as the wave moves from Head sea to Beam sea direction. A MATLAB source code was developed to validate the result for heave motion at head sea. Although a small difference in predicted heave motion occurred, it is pertinent to note that the comparisons between results generated in the MATLAB program and ANSYS AQWA demonstrate generally good agreement, and the roll response of the FPSO is noted to be critical.展开更多
分析由3艘船[原油转驳船(Crude Transfer Vessel,CTV)、常规油船和拖船]组成的多浮体原油转驳系统在卸载作业过程中的稳定性。根据船舶定位和拖曳模式,考虑多浮体系统所受的复杂环境载荷(包括风载荷、海流载荷和波浪载荷),研究原油卸载...分析由3艘船[原油转驳船(Crude Transfer Vessel,CTV)、常规油船和拖船]组成的多浮体原油转驳系统在卸载作业过程中的稳定性。根据船舶定位和拖曳模式,考虑多浮体系统所受的复杂环境载荷(包括风载荷、海流载荷和波浪载荷),研究原油卸载过程中多浮体系统在不同环境条件下保持准静态平衡的可能位置,得出保持准静态平衡时CTV推进器所需的最小推进力。结果表明,对于特定的风、流和波浪载荷方向,3艘船之间的夹角必须位于一定的范围内才能保持多浮体系统的平衡。展开更多
文中利用水动力分析软件AQWA研究了单点系泊FPSO(floating production,storage and offloading system)与油轮串靠外输时的水动力干扰及不同内转塔位置下串靠外输系统的运动响应,分析了不同转塔位置对FPSO风标效应及外输安全性的影响....文中利用水动力分析软件AQWA研究了单点系泊FPSO(floating production,storage and offloading system)与油轮串靠外输时的水动力干扰及不同内转塔位置下串靠外输系统的运动响应,分析了不同转塔位置对FPSO风标效应及外输安全性的影响.计算结果表明串靠外输时两船的装载情况对水动力干扰影响较大,低频波浪入射时串靠驳船的存在对FPSO二阶漂移力的影响较大,不同的转塔位置对FPSO-油轮系统风标效应存在显著影响.文中计算的4种工况中,FPSO内转塔位置距船艏约25%船长处最合理,风标效应较强且外输安全性较高.文中的计算及分析结果对内转塔式FPSO及外输系统的设计具有一定指导意义.展开更多
基金Supported by the National 111 Project of China under Grant No.B07019Important National Science & Technology Specific Project:Numerical Simulation and Experimental Investigation of FPSO and Offloading System,No.2011ZX05030-006-002
文摘In order to provide a theoretical guide for choosing the material for the hawsers for the FPSO side-by-side offloading system, which is moored by the yoke system, the 3D potential flow theory and full coupled time-domain analysis are presented to study the dynamic response of the offloading system. The MingZhu FPSO offloading system in the field BZ25-1 is simulated here; and four different characteristic fiber ropes are used as the material for the hawsers. To acquire an accurate hawser line tension, the polynomial fitting method is used to calculate the nonlinear stiffness of the hawsers. By comparing the hawser lines＇ tension and the relative motion between the FPSO and the shuttle tanker, a suitable material for the hawser lines is chosen and discussed in this paper. The results indicate that the nonlinear stiffness characteristic of the fiber rope has a small effect on the relative motion of the vessels, but the hawser lines＇ tension is greatly influenced by the different characteristics of the fiber ropes. The hawser lines＇ tension with nonlinear stiffness is in accordance with the one with the upper and lower bound linear stiffness, which proves this method of fitting the fiber ropes＇ nonlinear stiffness is reasonable and reliable.
文摘基于现有的渤海浮式生产储卸油装置(Floating Production Storage and Offloading,FPSO)实测数据,开展海洋核动力平台(Marine Nuclear Power Platform,MNPP)定位系统多体动力特性分析。建立MNPP定位系统的多刚体动力学模型,通过MNPP与渤海某FPSO的响应幅值算子(Response Amplitude Operator,RAO),计算FPSO船体实测数据与MNPP响应的比例系数;根据FPSO船体实测数据计算MNPP六自由度数据,并采用经验模态分解(Empirical Mode Decomposition,EMD)方法保留原始数据的波频成分,在此基础上计算定位系统的系泊回复能力和各铰节点的受力行为。通过与FPSO软刚臂系泊系统受力状态进行对比分析,验证MNPP定位系统在实测海况下设计的合理性。可为MNPP系泊结构设计和安全运行提供科学的分析手段。
文摘The driving necessities of cost reduction and the need to develop fields at ever increasing water depths have led to the use of floating structures. Among these structures are the Floating Production Storage and Offloading (FPSO) units whose motion analysis is considered in this paper. In actual environmental condition, it is required to accurately determine or predict large amplitude motion of the FPSO before any offshore operation. This paper seeks to present a detailed method of computing the Response Amplitude Operator(s) (RAOs) for the six (6) degrees of freedom using ANSYS AQWA. The results indicate for Heave motion a tendency for the heave peak value to move slightly higher dimensionless encounter-frequency as the wave moves from Head sea to Beam sea direction. A MATLAB source code was developed to validate the result for heave motion at head sea. Although a small difference in predicted heave motion occurred, it is pertinent to note that the comparisons between results generated in the MATLAB program and ANSYS AQWA demonstrate generally good agreement, and the roll response of the FPSO is noted to be critical.
文摘分析由3艘船[原油转驳船(Crude Transfer Vessel,CTV)、常规油船和拖船]组成的多浮体原油转驳系统在卸载作业过程中的稳定性。根据船舶定位和拖曳模式,考虑多浮体系统所受的复杂环境载荷(包括风载荷、海流载荷和波浪载荷),研究原油卸载过程中多浮体系统在不同环境条件下保持准静态平衡的可能位置,得出保持准静态平衡时CTV推进器所需的最小推进力。结果表明,对于特定的风、流和波浪载荷方向,3艘船之间的夹角必须位于一定的范围内才能保持多浮体系统的平衡。
基金上海市自然科学基金资助项目(11ZR1417800)the LRET(Lloyds Register Educational Trust)to the joint centre involving University College LondonShanghai Jiao Tong University and Harbin Engineering University
文摘文中利用水动力分析软件AQWA研究了单点系泊FPSO(floating production,storage and offloading system)与油轮串靠外输时的水动力干扰及不同内转塔位置下串靠外输系统的运动响应,分析了不同转塔位置对FPSO风标效应及外输安全性的影响.计算结果表明串靠外输时两船的装载情况对水动力干扰影响较大,低频波浪入射时串靠驳船的存在对FPSO二阶漂移力的影响较大,不同的转塔位置对FPSO-油轮系统风标效应存在显著影响.文中计算的4种工况中,FPSO内转塔位置距船艏约25%船长处最合理,风标效应较强且外输安全性较高.文中的计算及分析结果对内转塔式FPSO及外输系统的设计具有一定指导意义.
