Collision Analysis Of Tripod Foundation For Offshore Wind Turbine Based On VFIFE

Wind energy is one of sustainable clean energy with wide distribution and unlimited space for development.With land wind energy has been effectively used,offshore wind energy has been a new strategy for sustainable development in many coastal countries.Foundation is the support structure of offshore wind turbine(OWT),and its safety relates to the normal operation of the whole wind turbine generator system.Ship collision is an important factor related with safety of foundation for OWT.Currently,traditional finite element method has disadvantages of long calculating time and convergence difficulty.Response of tripod foundation for OWT caused by ship collision is systematically studied with Vector Form Intrinsic Finite Element(VFIFE)method in the paper.Some meaningful conclusions are obtained from research work,which can provide references for similar research in the future.The main researches are as the following part.(1)Based on VFIFE beam theory,formula of static and ship collision for tripod foundation is derived.Calculation program is compiled using MATLAB.In addition,the result of VFIFE is verified using LS-DYNA.(2)Taking a tripod foundation of 3.0MW OWT as the research object,mechanical response of the tripod foundation is calculated using VFIFE,considering the working load and environmental load.Displacement and stress on foundation is also discussed.(3)Collision processes of the tripod foundation is simulated using VFIFE and MATLAB,considering different ship tonnage and different ship speed.The displacement,speed,stress,collision force and kinetic energy of tripod foundation to different ship tonnage and different ship speed is compared and analyzed.