@inproceedings{be5c0c26155d4e5dadb99e5984b6f0de,
title = "An effective method to predict the motion of DDMS platform with Steel Catenary Riser",
abstract = "Steel Catenary Riser (SCR) has become a good alternative option compared with the traditional flexible riser due to its low cost, and consequently SCR is widely applied on Spar and TLP platforms as well as FPSO and Semi recently. However, the fatigue problems of SCR are very remarkable and sensitive to the host platform motion characteristics to which they are attached. As we known that the platform is not an individual system, and actually the platform motions are significantly affected by the interaction of hull, mooring lines and risers. The fully coupled model is a direct approach to this complex issue; whereas it costs much computer resource and calculation time especially when the water depth toward to deep as well as the number of SCR or mooring lines increase. Therefore, this paper attempts to establish a simple and effective method which is essentially a decoupled approach with enhanced strategies to predict the platform motion. The SCR induced damping is identified via the free-decay tests. The initial amplitude and mean offsets needed for the free-decay tests are estimated by using a fast frequency domain analysis subjected to the 2nd order wave slow drift and time-varying wind forces. In addition, the relationship of SCR quantity and damping ratios is acquired which is subsequently used to estimate the SCR damping of arbitrary SCR quantity. The platform motions under two cases with different SCR quantity simulated by this new effective method perfectly agree with rigorous fully coupled model determined by commercial program. The correlation, coefficients of low frequency (L-F) motions are above 0.966, and which of wave frequency (W-F) are around. 0.9. Furthermore, the effective method saves about 20 times of calculation time than the fully coupled model. Additionally, the novel Deep draft multi-spar (DDMS) platform is selected to be the host floater, and this paper also shows the updating version through optimization based on the original concept.",
keywords = "Coupled model, Frequency domain, Hydrodynamics, Riser, Spar, Time domain",
author = "Binbin Li and Jinping Ou",
year = "2010",
language = "英语",
isbn = "9781880653777",
series = "Proceedings of the International Offshore and Polar Engineering Conference",
pages = "521--528",
booktitle = "Proceedings of the 20th (2010) International Offshore and Polar Engineering Conference, ISOPE-2010",
note = "20th International Offshore and Polar Engineering Conference, ISOPE-2010 ; Conference date: 20-06-2010 Through 25-06-2010",
}