Coupling Dynamic Analysis Of Taut-wire Deepwater Mooring Lines With The Upper Platform

With the growing energy demands of industrial technology, deep-sea oil and gas gradually developed from inland areas to the deep sea, and has become an inevitable trend. With China's rapid economic development, China's consumption of oil and gas is also growing rapidly, China's oil and gas pressure becomes bigger and bigger. Therefore, the development of deep-sea oil and gas is not only important for the implementation of China's marine development strategy, but also ainevitable choice to ease pressure on scarce oil and gas resources and energy security.FPSO, s emi-submersible p latform, te nsion le g p latform (T LP) a nd single column (Spar) platform as the most promising new generation of offshore platforms have attracted much attention, and its mooring system gradually transformed from conventional catenary into new taut style. At first, this project made a research of the conventional c atenary style m ooring lin es. The cat enary m ethod i s us ed t o calculate the static characteristics, draws the static response of mooring lines and the relationship of floating body and weight. Then on the basis of lumped mass method, the dynamic characteristics were calculated. The influence of amplitude and natural frequency on t he e ndpoint were al so analysis. The s econd, ba sed on t he d ynamic stiffness t heory, t he d ynamic ch aracteristics of taut w ire m ooring lines w ere calculated, the node trajectory and tension curves have been obtained. The restoring force of whole the mooring system are analyzed. Subsequently considered seabed roughness and elastic, using the compiled program to analysis the influence.In addition, this project is respectively based on the C# programming language developing the dynamic characteristics o f catenary and synthetic fiber mooring visualization software. Through import of different example calculated the dynamic characteristics of synthetic fiber mooring lines, some rules and conclusions are obtained, provide certain theoretical basis for the research of new deepwater mooring system for the future.Finally, based on Sesam software, the coupled motion of the taut wire mooring cable in deep s ea and t he upper pa rt o f t he floating body a re calculated and an alyzed, obtained t he upper f loating body 6 de grees o f freedom mo tion, choose 4 lines,8 lines and 12 lines mooring s ystem compared to draw certain conclusions.