Structural Design And Shape Optimization Of Spiral Propulsion Underwater Vehicle

The vast territory of the sea,the development and utilization of the sea,the revitalization and implementation of a series of national marine strategies,such as the strength of the sea,all need the support of a series of marine equipment,and the underwater vehicle,as a high-tech equipment,is an important means of marine exploration.It is the key to realize the exploration of ocean mission to realize the underwater vehicle’s large range,high speed and carrying many kinds of detection equipment.By designing and optimizing the autonomous spiral propulsion underwater vehicle,this paper aims to improve the hydrodynamic performance of the vehicle.Firstly,the overall scheme of underwater vehicle is designed,and the design flow of this paper is made according to its system composition and performance requirements.After analyzing and summarizing the "flagfish" underwater vehicle,this paper presents the preliminary design of the shape profile profile of the underwater vehicle.Based on computational fluid mechanics,the hydrodynamic performance of the shape profile profile of the vehicle is analyzed and compared.The ballast-resistant and segment connection structure of underwater vehicle is the safety foundation of the internal components of the whole vessel.Based on the theory of external pressure vessel design theory and the simulation of ANSYS software,the design and analysis of pressure-resistant shell are carried out.After analyzing the connection mode of the first generation underwater vehicle,it is decided to use wedge ring structure to connect between the sections,and the safety and reliability of wedge ring are analyzed.The propulsion system is the basis for the underwater vehicle to realize navigation speed,maneuverability and large range.The propulsion system includes three modules: tail wing optimization design,duct propeller chart design and propulsion system energy supply.The tail wing is designed by bionics to obtain better resistance performance on the basis of the same control performance;the tube propeller increases the structure of the tube,reduces the cavitation phenomenon and improves the propulsion efficiency;and the energy supply adopts the lithium-sulfuric chloride battery pack with higher energy density,and the efficiency of the energy supply is verified by experimental comparison.After the initial design,genetic algorithm is used to optimize the shape of the navigator,with low navigation resistance and large displacement as the optimization objectives,and the optimized size is verified by hydrodynamic performance analysis.