Conceptual Design And Hydrodynamic Performance Optimization Of Underwater Glider

As an important part of the earth’s continent,the ocean contains a large number of rare resources.The increasing competition of marine resources between countries has become the focus of contemporary resource competition.Among all kinds of resource detection equipment,underwater glider has become the outstanding marine detection equipment.Underwater glider is a kind of underwater robot with low power consumption,long endurance and wide working range.The main work of this paper is to carry out conceptual design for underwater glider at first.Through the analysis of the principle of underwater glider,the main functional requirements and main functional components of the glider are obtained.On this basis,the basic conceptual design is completed.Next,the optimization method of the underwater glider used in this paper is introduced.Through the improvement of the traditional optimization algorithm,combined with genetic algorithm,the shape optimization of the underwater glider is completed.This paper focuses on the numerical calculation and analysis of the hydrodynamic performance of the underwater glider in floating and diving,and compares the performance changes before and after the shape optimization in detail.Finally,the accuracy of the data is verified by the physical experiment of the optimized shape.The main research results are as follows:(1)By analyzing the principle of underwater glider gliding,the conceptual design of underwater glider is completed.Based on the analysis of the advantages and disadvantages of the traditional configuration of the glider,this paper compares the advantages and disadvantages of the traditional configuration of the glider.On this basis,according to the design concept of the internal components of the preliminary selection and analysis,and for the components of the initial placement and static stability analysis,completed the conceptual design of the whole.(2)The optimization method of underwater glider is studied.The improved Hicks-henne airfoil optimization algorithm is used to optimize and improve the airfoil.Bessel curve is used to smooth link the plane shape,and parameterization is used to control the spanwise thickness.Based on these,the shape parameters of underwater glider are described.Combined with the second generation genetic algorithm,the shape of the glider is optimized under the designed speed.(3)The hydrodynamic performance of underwater glider before and after optimization is compared in detail.Based on CFD software,the force of underwater glider in steady state is analyzed.Firstly,a numerical model is established to calculate the performance of the glider before and after optimization.According to a large number of data under working conditions,the lift drag characteristics of the underwater glider at different speeds and angles of attack are obtained.The lift drag ratio of the optimized underwater glider is increased by 14% compared with the original design scheme.(4)Aiming at the hydrodynamic performance of the optimized shape of the underwater glider,the numerical simulation of the circulating pool is carried out,and on this basis,the physical shape experiment is carried out to verify the accuracy of the experimental data.