Tension Leg Platform Hydrodynamic Response And Global Strength Research

Ocean exploitation towards deepwater is the general trend of the world offshore oil andgas exploration and development, which means deep sea platform technology will becomes aresearching hotspot in Ocean Engineering field. Tension Leg Platform (TLP) as a typicaldeepwater floating structure, can provide a better motion performance and more stableoperating conditions. Especially in the depth of1000m-2000m, its economic performance ismore obvious, so it is the preferred type of deepwater floating platform.This paper uses “Typical Deepwater Tension Leg Platform” as parent form, with SouthChina Sea specific environment conditions and specifications, carries on preliminary designand analysis of target TLP. It can be used as a reference for practical TLP design andconstruction, and also is very important for China deep sea platform technology development.First of all, this paper summarizes the analysis methods and processes about TLPhydrodynamic response and global strength. Under the premise of considering tension legs,risers and ballast water, establishes TLP hydrodynamic model and completes TLPhydrodynamic response analysis based on three-dimensional potential flow theory.Meanwhile discusses the effect caused by TLP structure forms, pretension, number andstiffness of tension legs on TLP global motion response, and through comparative analysis toobtain valuable conclusions.Secondly, according to the South China Sea environmental conditions and loading cases,establishes TLP wave load calculating model to calculate typical profile load. Then obtain thelong term forecasting values through the probability and statistical analysis method.Finally, determines the design wave parameters and combination conditions which usedfor global strength analysis based on design wave and spectrum method. Then sets up TLPglobal finite element model, calculates TLP deformation modes and Von-Mises stress underdifferent load cases, and completes TLP global strength analysis to determine the key factorswhich affect TLP global strength.