Energy Dissipation Performance And Mechanism Analysis Of A New Type Of Anti-collision Device For Offshore Wind Power Foundation

With the development of offshore wind power industry and shipping industry,there are more and more collisions between ships and marine engineering structures.Once a collision happens,it may cause casualties,sinking of ships and environmental pollution.Therefore,it is necessary to analyze the anti-collision of offshore wind power.Based on the anti-collision of mono-pile foundation of offshore wind power,this paper presents a floating FRP energy consumption anti-collision device,and studies the energy consumption performance and energy consumption mechanism of the anti-collision device by numerical simulation.The main research contents of this paper are as follows:(1)This paper first summarizes the research methods of ship collision at home and abroad,analyzes the characteristics of the existing anti-collision devices,and puts forward the possible problems that the anti-collision device can be applied to the offshore platform.A floating FRP energy consumption anti-collision device is proposed.(2)The preliminary design of the anti-collision device is carried out for offshore wind infrastructure.Considering the two working conditions of whether there are anti-collision device,the simulation is carried out by the finite element software ABAQUS,and the energy consumption,impact force,collision time,stress and strain of the mono-pile foundation during the collision process are analyzed.The analysis results show that : The collision time of the condition which the offshore wind turbines has anti-collision device is 2.36 times longer than that without the anti-collision device,and the maximum impact force is reduced by 57.5%.This means that the anti-collision device can effectively protect the mono-pile foundation.At the same time,the energy consumption mechanism and damage mode of anti-collision device are deeply studied,The results show that the energy consumption of the anti-collision device is mainly achieved by the structural deformation and material failure.The tensile failure of the material matrix is the main failure mode.Which provides some theoretical basis for the design of anti-collision device.(3)This paper has a parameter analysis for energy consumption performance of the anticollision device,and takes threes parameters into consideration,namely thickness of the ply of the unit 1 and the unit 2 and the size of the grid of the unit 1.The ABAQUS software is used to analyze the dynamic effects of these parameters on the energy consumption and the impact force of the anti-collision system.The calculation results show that the energy consumption performance of the anti-collision device can be improved and the maximum impact force can be reduced by changing the parameter value.At the same time,the collision parameters of the ship are analyzed.The influence of speed and mass of the ship is mainly studied.The energy dissipation law of the anti-collision device under different conditions is obtained.