Parameter Correlation Analysis And Configuration Optimization For The Anti-collision Device For Mono-pile Foundation Of Offshore Wind Turbine

As an important direction for the development of renewable energy,offshore wind power is concerned by all countries in the world.With the gradual increase of global offshore wind farms,the importance of infrastructure protection has also become increasingly prominent.Therefore,it is very important for the safe operation of offshore wind turbines to design economical and practical anti-collision devices and to design them lightweight.In this paper,a composite material anti-collision device is taken as the research object,the parameter correlation analysis and configuration optimization design are explored to find a more reasonable component size,and the energy consumption of the optimized anti-collision device is evaluated and analyzed.The main research contents of this paper are as follows:(1)According to the initial design size of the anti-collision device,the finite element model is established,and the static analysis is performed to analyze the mechanical properties of the anti-collision device and pile foundation.(2)After the parameter correlation analysis,the key design parameters of the anti-collision device were found.In order to minimize the total weight of anti-collision device and to minimize the Mises stress of pile foundation,multi-objective optimization of the anti-collision device is carried out.After the optimization,the total weight of anti-collision device is decreased by 34.36%,and the maximum Mises stress of pile foundation is decreased by 30.73%.(3)The explicit dynamic analysis software LS-DYNA was used to simulate the whole process of the collision between the ship and the anti-collision device.After that,the energy dissipation capacity of anti-collision device before and after optimization is compared and evaluated.After the optimization,the maximum impact force on pile foundation is decreased by 17.46%;the total energy dissipation of anti-collision device is increased by 9.27% and the ratio of energy dissipation to quality is increased by 66.32%.The energy distribution of optimized anti-collision device components has been significantly changed.The energy dissipation proportion of unit 1 is decreased from 93.25% to 65.53%;The energy dissipation proportion of unit 2 is increased from 1.05% to 29.42%;The energy dissipation proportion of support structure is decreased from 5.70% to 5.05%.In this paper,the optimized anti-collision device can delay the growth of the impact force to a certain extent and can reduce the maximum impact force.The energy dissipation capacity and the ratio of energy dissipation to quality of the optimized anti-collision device are obviously improved.