Deployment of buoy systems is one of the most important procedures for the operation of buoy system. In the present study, a single-point mooring buoy system which contains surface buoy, cable segments with components...Deployment of buoy systems is one of the most important procedures for the operation of buoy system. In the present study, a single-point mooring buoy system which contains surface buoy, cable segments with components, anchor and so on is modeled by applying multi-body dynamics method. The motion equations are developed in discrete node description and fully Cartesian coordinates. Then numerical method is used to solve the ordinary differential equations and dynamics simulations are achieved while anchor is casting from board. The trajectories and velocities of different nodes without current and with current in buoy system are obtained. The transient tension force of each part of the cable is analyzed in the process of deployment. Numerical results indicate that the transient payload increases to a peak value when the anchor is touching the seabed and the maximum tension force will vary with different floating configuration. This work is helpful for design and deployment planning of buoy system.展开更多
In the present study, the dynamic response of a coupled SPM-feeder-cage system under irregular waves and shear currents is analyzed. A numerical model is developed by using the commercial software Orca Flex. Hydrodyna...In the present study, the dynamic response of a coupled SPM-feeder-cage system under irregular waves and shear currents is analyzed. A numerical model is developed by using the commercial software Orca Flex. Hydrodynamics coefficients of the vessel are calculated by using a 3D diffraction/radiation panel program. First- and second-order wave forces are included in the calculations. Morison equation is used to compute the drag force on line elements representing the net. Drag coefficients are determined at every time step in the simulation considering the relative normal velocity between the structural elements and the fluid flow. The dynamic response of the coupled system is analyzed for various environments and net materials. The results of the study show the effects of solidity ratio of the net and vertical positions of the cage on the overall dynamic response of the system, confirming the viability of this type of configuration for future development of offshore aquaculture in deep waters.展开更多
年检过程中发现渤海油田"渤海友谊号"浮式生产储油卸油装置(Floating Production Storage and Offloading,FPSO)单点系泊系统单点左右舷系泊腿存在故障,为消除油田安全隐患,需更换系泊腿。通过研究系泊腿的结构形式,初步判断...年检过程中发现渤海油田"渤海友谊号"浮式生产储油卸油装置(Floating Production Storage and Offloading,FPSO)单点系泊系统单点左右舷系泊腿存在故障,为消除油田安全隐患,需更换系泊腿。通过研究系泊腿的结构形式,初步判断故障原因,确定只更换系泊腿上半部分的工作范围;在方案可行性研究阶段,对比分析停产工期、风险及施工效率等,制定在码头更换系泊腿的基本策略;在设计系泊腿拆卸方案时,选择重型销轴开销器作为首选、金刚石绳锯机作为备用的施工方案,最终成功完成单点系泊腿的快速更换工作,使得油田停产时间比原计划缩短18d,经济效益显著提高。该项目是解决水上软刚臂单点系泊腿故障问题的一个典型案例,涉及策略制定、施工方案设计、海上施工与油田复产、冬季施工气候窗口选择及主线辅线施工相互配合等,对类似工程的研究具有借鉴意义。展开更多
基金supported by the National Natural Science Foundation of China (Grant No. 51175484)the Science Foundation of Shandong Province (Grant No. ZR2010EM052)
文摘Deployment of buoy systems is one of the most important procedures for the operation of buoy system. In the present study, a single-point mooring buoy system which contains surface buoy, cable segments with components, anchor and so on is modeled by applying multi-body dynamics method. The motion equations are developed in discrete node description and fully Cartesian coordinates. Then numerical method is used to solve the ordinary differential equations and dynamics simulations are achieved while anchor is casting from board. The trajectories and velocities of different nodes without current and with current in buoy system are obtained. The transient tension force of each part of the cable is analyzed in the process of deployment. Numerical results indicate that the transient payload increases to a peak value when the anchor is touching the seabed and the maximum tension force will vary with different floating configuration. This work is helpful for design and deployment planning of buoy system.
基金Kampachi Farms LLC for their support to complete this work and for all the technical information provided to complete the numerical model
文摘In the present study, the dynamic response of a coupled SPM-feeder-cage system under irregular waves and shear currents is analyzed. A numerical model is developed by using the commercial software Orca Flex. Hydrodynamics coefficients of the vessel are calculated by using a 3D diffraction/radiation panel program. First- and second-order wave forces are included in the calculations. Morison equation is used to compute the drag force on line elements representing the net. Drag coefficients are determined at every time step in the simulation considering the relative normal velocity between the structural elements and the fluid flow. The dynamic response of the coupled system is analyzed for various environments and net materials. The results of the study show the effects of solidity ratio of the net and vertical positions of the cage on the overall dynamic response of the system, confirming the viability of this type of configuration for future development of offshore aquaculture in deep waters.
文摘针对浅水环境下典型外单点系泊系统的结构特性,建立悬链锚腿式系泊系统(Catenary Anchor Leg Mooring System,CALM)、单锚摇臂式系统(Sal Yoke System,SYS)、水上软刚臂式系泊系统(Soft Yoke Mooring System,SYMS)3种单点系泊系统和浮式生产储卸油装置(Floating Production Storage and Offloading,FPSO)船体的多体水动力模型。基于船体与外单点系泊系统的时域耦合分析算法,综合考虑风、浪、流载荷的影响,计算得到FPSO的运动响应和外单点系泊系统所受载荷,统计和比较各单点系统的系泊性能和特点,为浅水环境下外单点系泊系统的设计研究提供理论依据。
文摘年检过程中发现渤海油田"渤海友谊号"浮式生产储油卸油装置(Floating Production Storage and Offloading,FPSO)单点系泊系统单点左右舷系泊腿存在故障,为消除油田安全隐患,需更换系泊腿。通过研究系泊腿的结构形式,初步判断故障原因,确定只更换系泊腿上半部分的工作范围;在方案可行性研究阶段,对比分析停产工期、风险及施工效率等,制定在码头更换系泊腿的基本策略;在设计系泊腿拆卸方案时,选择重型销轴开销器作为首选、金刚石绳锯机作为备用的施工方案,最终成功完成单点系泊腿的快速更换工作,使得油田停产时间比原计划缩短18d,经济效益显著提高。该项目是解决水上软刚臂单点系泊腿故障问题的一个典型案例,涉及策略制定、施工方案设计、海上施工与油田复产、冬季施工气候窗口选择及主线辅线施工相互配合等,对类似工程的研究具有借鉴意义。
