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Nonlinear coupled dynamics analysis of A Truss Spar Platform

China Ocean Engineering 2016年第6期30卷 835-850页

作者： LI Cheng-xi ZHANG Jun Department of Mechanical Engineering Massachusetts Institute of Technology Department of Civil Engineering Texas A&M UniversityCollege Station

Accurate prediction of the offshore structure motion response and associate mooring line tension is important in both technical applications and scientific research. In our study, a truss spar platform, operated in Gulf of Mexico, is numerically simulated and analyzed by an in-house numerical code ＇COUPLE＇. Both the platform motion responses and associated mooring line tension are calculated and investigated through a time domain nonlinear coupled dynamic analysis. Satisfactory agreement between the simulation and corresponding field measurements is in general reached, indicating that the numerical code can be used to conduct the time-domain analysis of a truss spar interacting with its mooting and riser system. Based on the comparison between linear and nonlinear results, the relative importance of nonlinearity in predicting the platform motion response and mooring line tensions is assessed and presented. Through the coupled and quasi-static analysis, the importance of the dynamic coupling effect between the platform hull and the mooting/riser system in predicting the mooting line tension and platform motions is quantified. These results may provide essential information pertaining to facilitate the numerical simulation and design of the large scale offshore structures.

关键词： coupled dynamic analysis nonlinear effect hybrid wave model (HWMO

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Time-domain floater stress analysis for a floating wind turbine

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Journal of Ocean Engineering and Science 2023年第4期8卷 435-445页

作者： Zhen Gao Daniel Merino Kai-Jia Han Haoran Li Stian Fiskvik School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityChina Department of Marine Technology Norwegian University of Science and TechnologyNorway COWI Energy International COWINorway DNV AS HøvikNorway College of Harbour Coastal and Offshore EngineeringHohai UniversityChina

There are increasing focuses on developing cost-effective floating wind turbines,for which efficient stress analysis methods are needed for floater structural *** of the today’s studies focus on global analysis methods in which the floater is assumed as a rigid body or multiple rigid bodies and the stress distributions in the floater cannot be directly *** part of the COWI Fonden funded EMULF project,a summary about the methodology,the numerical modeling procedure and the verification for stress response analysis of a semi-submersible floater for a 15MW wind turbine is *** analy-sis procedure includes the regeneration of the hydrodynamic pressure loads on the external wet surface of the floater due to wave diffraction,radiation and hydrostatic pressure change,and the application of these pressure loads,together with the time-varying gravity due motions,the inertial loads and the forces/moments at the boundaries(*** bottom and mooring line fairleads)of the floater to obtain the deformation and the stresses of the floater in the time *** analysis procedure is imple-mented in a developed MATLAB code and the DNV software *** importance of the different hydrodynamic pressure components was discussed considering representative sea states.A verification of the obtained stress time series and statistics using this method against the regeneration from a linear frequency-domain approach was made considering irregular wave actions only,and a very good agree-ment was *** developed methodology can provide an efficient solution for structural design analysis of floating wind turbines.

关键词： Floating wind turbine Floater stress analysis Hydrodynamic pressure coupled dynamic analysis

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