The Optimized Design Of The Unmanned Sailboat Wing Sail For Ocean Monitoring

As countries around the world recognize the importance of marine resources and marine strategic status,marine monitoring technology has developed rapidly.At the same time,sailing technology is favored by the shipping industry for its green and environmental advantages.Therefore,unmanned sailboats are used to develop marine three-dimensional Comprehensive monitoring has become one of the current hotspots of scientific research.In order to improve the sailing performance of the unmanned sailboat,this paper uses the wing design theory to improve the sail of the sailboat,and proposes a rigid wing sail with a tail and optimizes the design.First,by comparing the performance of flexible sail and rigid sail,symmetrical section airfoil and asymmetrical section airfoil,it is determined that the main sail airfoil is NACA 0021 and the tail airfoil is NACA 0018 symmetrical rigid sail to improve the aerodynamic performance of the sailboat;At the same time,the tail wing is used to control the angle of attack between the main sail and the air flow,which reduces the difficulty and power consumption of the automatic sail control of the unmanned sailboat.The force situation of the wing sail is analyzed,which theoretically proves the correctness of the design.Through testing the test ship,it is concluded that the fluid and structural performance of the wing sail needs to be further analyzed and optimized.Then,based on CFD technology,Fluent software is used to analyze the influence of wing sail design parameters on the aerodynamic performance of the mainsail.After analysis,it is concluded that the larger the aspect ratio,the better the aerodynamic performance and thrust performance of the mainsail;the left and right positions of the tail affect the mainsail.Lift has a small effect;changing the up and down position of the tail will not affect the lift of the mainsail;when the mainsail taper ratio is 0.6,the mainsail has the best aerodynamic performance and thrust performance.According to the simulation results and the principle of maximum thrust coefficient,the design parameters of the wing sail are optimized,and the outer dimensions of the wing sail are determined.Secondly,in order to optimize the internal structure of the mainsail and achieve lightweight design,the aerodynamic load calculated by the Fluent software is applied to the surface of the mainsail,combined with the ANSYS Workbench software,a topology-size joint hierarchical optimization method is proposed.The main sail structure model of skin,"I"-shaped wing spar and truss-type ribs.The response surface analysis method is used to analyze the influence of each size parameter on the mainsail structure performance and quality,and it is determined that the two size parameters of the skin thickness and the wing spar width have a greater impact on the mainsail structure performance and quality.After optimizing the size of the main sail structure,it is finally determined that the skin thickness is 2.8mm,the wing spar thickness is 3mm,the wing spar width is 21 mm,and the rib thickness is 3.2mm.The optimized mainsail meets the structural design requirements,and the mass is reduced by 38.68%.Finally,according to the optimization results,the carbon fiber composite material unmanned sailboat was built for sailing test,and the test results were satisfactory.This research has great application value for the use of small unmanned sailboats to explore the ocean.