Design Of Drifting Buoy And Research About It's Hydrodynamic Capability

The research on the law of ocean current flow and the generation mechanism has always been an important subject in ocean research,which is of great significance to the country's economy,culture and national defense and military construction.Drifting buoys have the advantages of small size,easy delivery,simple operation and wide range of use,and are widely used in ocean current measurement and monitoring.According to the technical requirements of drifting buoys,a drifting buoy with high safety and high observation accuracy was designed,and static analysis,flow field analysis and hydrodynamic performance analysis were carried out.The drifting buoy is composed of three parts: buoy body,sail and positioning communication module.According to the technical requirements of each part of the drift buoy,the design of the drift buoy is completed.The design of the positioning communication module includes the selection of the Iridium communication module,the design of the four-arm helical antenna,the calculation of power consumption,the selection of the client module and the decompression of the mailbox data;the design of the buoy body includes the design of the structure and the selection of the material,Fixed way,concealed and hydrophobic design;the design of sail includes structure design and material selection.Solve the impact of the environmental load force on the drift buoy body,calculate the environmental load in the ultimate survival environment,perform static analysis through the Static Structure module in ANSYS Workbench,and ensure that the buoy body meets the strength requirements;perform characteristic buckling analysis through the Eigenvalue Buckling module Verify the stability of the buoy body;analyze the flow field through the Fluent module to simulate the flow field results under the action of wind and seawater: wind and seawater have the smallest effect on the spherical buoy body,followed by the gourd-shaped buoy body,and the cylindrical buoy body.Through the Hydrodynamic Diffraction module,the hydrodynamic performance of the floating buoy body is analyzed to study the influence of waves on the buoy body.It mainly includes additional mass coefficient,damping coefficient,first-order linear wave force and RAO response factor.Through comparative analysis,it is concluded that the gourd-shaped buoy body has the best wave resistance,followed by the spherical shape,and the cylindrical buoy body has the worst wave resistance.Through the Hydrodynamic Response module,the overall analysis of the drift buoy is carried out,and the hydrodynamic performance of the drift buoy under the combined action of wind load,sea current load and wave load is studied.The hydrodynamic performance of thegourd-shaped drift buoy is better than that of the cylindrical drift by comparative analysis Buoys and spherical drifting buoys.Through the optimized design of the gourd-shaped buoy body,it can be concluded that reducing the maximum outer diameter can effectively improve the hydrodynamic performance.After completing the design of the drifting buoy,the positioning transmission system test and the overall buoyancy test of the drifting buoy were completed on the shore.Several sets of drifting buoys were deployed near the Dongsha Islands in the South China Sea and the data was successfully recovered.