Analysis On Response Of A Tri-floater Offshore Turbine

Wind is a renewable,pollution-free energy.As the most important renewableenergy,with the industrialization progressing and the pressure of the shortage of energybeing aggravated and the price of energy keeping rising,the development and utilization ofwind resources has caught the attention all over the world.At present,the base can be dividedinto Gravity-Based, Single pile-Based, Barrel-Based and Floater-Based.The supportstructure includes Single pile-Based,Tripod-Based,Jacket-Based,TLP,Tri-floater and Spar.With the offshore wind turbine farms expanding gradually into deep sea,Floater-Based isbecoming more and more famous in the county which is short of wind resources in coastalwater,such as the United States,Japan etc.And tri-floater offshore wind turbine infrastructureis appropriate to the deep sea environment.Firstly, the inevitable trend towards deep sea of wind farms is analyzed and the presentdevelopment situation of global wind turbine farms is introduced in this thesis.Secondly,thepresent situation of wind resource and wind power development in main countries,as well asthe main types and their characteristics of offshore wind turbine infrastructure inmainstream are introduced briefly.The characteristics of tri-floater offshore wind turbineinfrastructure is described in detail，and then it is compared with other types of offshorewind turbine.Finally,an appropriate field is chosen considering the distribution of windresources in our country.In this thesis,calculations of the response of the motion are carried out on a tri-floateroffshore wind turbine infrastructure with the software package of SESAM developed byDNV.The GeniE module is adopted to establish the structure model as well ashydrodynamic model.Then,the calculation of combined loads and motion response arecarried out in HydroD.Finally,hydrodynamic characteristics of this tri-floater offshore windturbine infrastructure are analyzed. During the calculation of the wave induced-load,thedesign wave method which is based on the3D hydrodynamic theory is adopted. The actingmode varied in loads upon the structure is analyzed,and the loads are combined inaccordance with the actual working situation. Separate calculation is conducted according todifferent sizes, different environmental parameters and different working conditions,andthen result is made a comparison with the purpose of supplying data for choosing the size ofstructure.