Study On Dynamic Performance Of Composite Anti-collision Device

At present,with the rapid development of marine transportation industry and the large-scale construction of offshore bridges and offshore wind power stations,there are many collisions between ships and offshore structures,resulting in significant loss of life and property.Therefore,it is urgent to design and study a new type of offshore anti-collision device.Taking the offshore single pile foundation as an example,a multi-layer lattice web reinforced polyurethane of foam core anti-collision device is designed.The numerical simulation method is used to study its dynamic performance under the ship impact and the protection effect on the pile foundation.The main work of this paper is as follows:? This paper summarizes the research methods and examples of anti-collision devices at home and abroad,and a flat cylindrical anti-collision device based on glass fiber reinforced epoxy resin matrix composite(GFRP)and polyurethane foam(PUR)is designed.It is divided into three layers from inner layer,middle layer to outer layer.? Under the impact of ship,the dynamic response of offshore single pile foundation under two working conditions are studied,including energy conversion and maximum impact force.Through numerical simulation,it is found that under the protection of anti-collision structure,96.3% of collision energy is absorbed by anti-collision device,and polyurethane foam is the main energy absorbing material,and the maximum impact force is reduced by 62.9% compared with that without anti-collision structure protection.It is found that GFRP and polyurethane foam can absorb energy through their own yield deformation.? By changing the internal and external factors of the anti-collision device,the dynamic response of the anti-collision device is further explored.By changing the density and rearrangement of the polyurethane foam,it is found that the polyurethane foam has a better overall energy absorption effect with the arrangement of the density from small to large,from the inner layer to the outer layer.With the different mass and impact speed of ship,two materials of the anti-collision device still maintain good stability,energy absorption effect and impact force.