Dynamic Responses of A Semi-Type Offshore Floating Wind Turbine During Normal State and Emergency Shutdown |
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| Authors: | HU Zhi-qiang LI Liang WANG Jin HU Qiu-hao and SHEN Ma-cheng |
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| Institution: | State Key Lab of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;State Key Lab of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;COTEC Offshore Engineering Solution Houston, Texas 77079, USA;State Key Lab of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;State Key Lab of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China |
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| Abstract: | This paper addresses joint wind-wave induced dynamic responses of a semi-type offshore floating wind turbine (OFWT) under normal states and fault event conditions. The analysis in this paper is conducted in time domain, using an aero-hydro-servo-elastic simulation code-FAST. Owing to the unique viscous features of the reference system, the original viscous damping model implemented in FAST is replaced with a quadratic one to gain an accurate capture of viscous effects. Simulation cases involve free-decay motion in still water, steady motions in the presence of regular waves and wind as well as dynamic response in operational sea states with and without wind. Simulations also include the cases for transient responses induced by fast blade pitching after emergency shutdown. The features of platform motions, local structural loads and a typical mooring line tension force under a variety of excitations are obtained and investigated. |
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| Keywords: | offshore floating wind turbine dynamic responses semi-type aerodynamic effects effective RAO emergency shutdown |
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