Dynamic Analysis Of Buoy Collision And Design Of Buoy Anti-collision Structure

The ocean data buoy is a mooring floating type of automatic monitoring platform that has continually served in atrocious marine environment.The sensor equipments can acquire information of marine meteorology,hydrology and ecology,which play an important role in disaster prevention and economic promotion.Due to the long-term continuous networking service characteristics,the buoy is increasingly likely to be damaged after collision by passing ships in recent years.What's more,the collision with powerful instantaneous impact can lead to acceleration overload that will cause damage to the precise sensors and communication systems on the buoy,resulting in the loss of buoy function.Therefore,it is of great engineering significance to research on the dynamic response of buoy collision and design a reasonable and effective buoy anti-collision structure.In this paper,the research method of dynamic response characteristics of a disc-shaped ocean buoy impacted by a ship hull has been studied.The equivalent deformation method based on Hertz contact theory has been proposed to evaluate the contact stiffness coefficient and continuous impact force of irregul ar bodies.The AQWA analysis software was used to solve the buoy hydrodynamic parameters.The fluid-solid coupling mechanical model of buoy collision was established in ADAMS to solve the collision force and acceleration amplitude response during the collision.Based on the above theoretical analysis methods,the anti-collision protection technology of buoys is studied.First of all,the collision dynamic response analysis of the established buoy was carried out.Meanwhile,the collision acceleration where communication electronic device is installed(i.e.the top of the buoy)was calculated.Then the collision safety of the buoy in active service was evaluated.Last but not least,three kinds of rubber anti-collision structures were proposed and analyzed by collision dynamics,namely semi-circular rubber protection ring,thick semi-circular rubber protection ring and partial hollow semi-circular rubber protection ring.The results showed that the three rubber protection structures c an significantly reduce the collision force by 33%-44% and peak collision acceleration by 28%-38%.Among them,the partial hollow semi-circular rubber protection ring has the best anti-collision performance.The protective measures can ensure that the acceleration of the buoy communication subsystem is always below the safe threshold during the collision,which has improved the reliability of the long-term continuous operation of the buoy electronic system.