API RP 2P规范推荐的准静力法是目前系泊分析中一种很有用的方法。在初步设计阶段,这种方法被广泛用于前期分析及系泊参数的选择。但是API RP 2P的准静力方法是针对单浮体制定的,即在计算步骤中只涉及到单个浮体。于是,在分析由双浮体(...API RP 2P规范推荐的准静力法是目前系泊分析中一种很有用的方法。在初步设计阶段,这种方法被广泛用于前期分析及系泊参数的选择。但是API RP 2P的准静力方法是针对单浮体制定的,即在计算步骤中只涉及到单个浮体。于是,在分析由双浮体(油轮和浮筒)构成的CALM系统时,这种方法难以实用。本文给出了一种适用于CALM系统的修正准静力方法。该方法将APIRP 2P的准静力方法做了一些修正。以反映CALM系统的特点。最后,文中提供了使用此方法分析一个CALM系统的结果。展开更多
A new full time-domain nonlinear coupled method has been established and then applied to predict the responses of a Truss Spar in irregular wave. For the coupled analysis, a second-order time-domain approach is develo...A new full time-domain nonlinear coupled method has been established and then applied to predict the responses of a Truss Spar in irregular wave. For the coupled analysis, a second-order time-domain approach is developed to calculate the wave forces, and a finite element model based on rod theory is established in three dimensions in a global coordinate system. In nu- merical implementation, the higher-order boundary element method （HOBEM） is employed to solve the velocity potential, and the 4th-order Adams-Bashforth-Moultn scheme is used to update the second-order wave surface. In deriving convergent solu- tions, the hull displacements and mooring tensions are kept consistent at the fairlead and the motion equations of platform and mooring-lines/risers are solved simultaneously using Newmark-fl integration scheme including Newton-Raphson iteration. Both the coupled quasi-static analysis and the coupled dynamic analysis are performed. The numerical simulation results are also compared with the model test results, and they coincide very well as a whole. The slow-drift responses can be clearly ob- served in the time histories of displacements and mooring tensions. Some important characteristics of the coupled responses are concluded.展开更多
文摘API RP 2P规范推荐的准静力法是目前系泊分析中一种很有用的方法。在初步设计阶段,这种方法被广泛用于前期分析及系泊参数的选择。但是API RP 2P的准静力方法是针对单浮体制定的,即在计算步骤中只涉及到单个浮体。于是,在分析由双浮体(油轮和浮筒)构成的CALM系统时,这种方法难以实用。本文给出了一种适用于CALM系统的修正准静力方法。该方法将APIRP 2P的准静力方法做了一些修正。以反映CALM系统的特点。最后,文中提供了使用此方法分析一个CALM系统的结果。
基金supported by the National High Technology Research and Development Program of China(Grant No.2006AA09A109-3)the Important National Science&Technology Specific Projects(Grant No.2008ZX05026-06-02)
文摘A new full time-domain nonlinear coupled method has been established and then applied to predict the responses of a Truss Spar in irregular wave. For the coupled analysis, a second-order time-domain approach is developed to calculate the wave forces, and a finite element model based on rod theory is established in three dimensions in a global coordinate system. In nu- merical implementation, the higher-order boundary element method （HOBEM） is employed to solve the velocity potential, and the 4th-order Adams-Bashforth-Moultn scheme is used to update the second-order wave surface. In deriving convergent solu- tions, the hull displacements and mooring tensions are kept consistent at the fairlead and the motion equations of platform and mooring-lines/risers are solved simultaneously using Newmark-fl integration scheme including Newton-Raphson iteration. Both the coupled quasi-static analysis and the coupled dynamic analysis are performed. The numerical simulation results are also compared with the model test results, and they coincide very well as a whole. The slow-drift responses can be clearly ob- served in the time histories of displacements and mooring tensions. Some important characteristics of the coupled responses are concluded.
