Flow-Solid Coupled Dynamics Analysis Of Flexible Webbed Wings Based On Bionic Behaviour

With the development and utilization of deep sea resources,more and more attention has been paid to Marine robots.A large number of underwater vehicles have been put into the ocean.The typical ocean observation equipment includes manned submersibles,buoys,autonomous underwater vehicles(AUVs),wile-controlled underwater vehicles(ROVs),underwater gliders and wave gliders,etc.All have different can.They have their own applications in water.Through millions of years of evolution and natural selection,Marine organisms can make good use of the surrounding flow field and have an extraordinary ability to cruise.Bionic technology is also in constant rapid development,bionic propulsion is now a new,innovative technology,now has carried out a lot of research Fish swim with high speed,high efficiency and low noise.Bionic propulsion refers to a way to generate propulsion force by imitating the structure or movement mode of natural organisms.Compared with the traditional propeller propulsion mode,it has the characteristics of good flexibility,low noise and high propulsion efficiency.With the rapid development of computer technology and the emergence of new materials,bionic propulsion has been applied to underwater robot.The fluid-structure coupling dynamic characteristics of flexible webbed wings are studied in this thesis.Using AQWA analysis software,first order wave forces of wave glider at six degrees of freedom were obtained by taking waves with different periods and wave heights,and the related hydrodynamic parameters were obtained.Secondly,the bending deformation of the flexible webbed wing under different sea conditions was analyzed,and the driving force model was established.Fluent module in ANSYS software was used to analyze the hydrodynamic performance of the webbed wing.The fluid-structure coupling simulation was carried out under the unsteady flow field of the webbed wing.The appropriate turbulence model was selected and the relationship between the pressure distribution of the flow field and the thrust change of the webbed wing was obtained through the fluid-structure coupling analysis.The flow field pressure of the webbed wing at different bending angles was obtained.Combined with the dynamic model,the bending Angle at the maximum driving force was obtained by analyzing the lift coefficient and drag coefficient.Finally,the principle prototype of the webbed airfoil wave glider is built.Combined with the experimental prototype and the flume experiment,the wave height is verified to analyze the velocity of the wave glider in the water,so as to prepare for the study of the perfect prototype.