| Underwater Glider(UG)is a new type of unmanned underwater vehicle driven by buoyancy.It is an effective method for realizing large-scale and long-time ocean observation and detection in the deep sea.The South China Sea China’s territorial sea is the largest and deepest sea area in my country’s coastal waters.The observation and detection of the sea area has set a technical requirement of 4000 m for the underwater glider.As the core pressure component of the body of underwater glider,the pressure chamber is the key to the development of deep sea glider.To this end,for the design and manufacture of 4,000-meter deep sea UG pressure hull,the research of material selection,composite pressure shell,connection structure,structural optimization,and experiments are carried out.Firstly,according to the pressure of 4000 m deep sea(40MPa),the common metal and non-metal materials are analyzed.Aluminum alloy,titanium alloy and carbon fiber composite materials are selected for the preliminary design of the pressure-resistant cylindrical shell.The rearrangement ratio of the cylindrical shell is analyzed to determine The carbon fiber composite material is used as the pressure-resistant cylindrical shell material,and the structural form of the pressure-resistant shell is determined according to the characteristics of the carbon fiber cylindrical shell;according to the mechanical properties of the carbon fiber composite material,the layup design of the carbon fiber cylindrical shell is completed;based on the adapter ring and carbon fiber Deformation coordination relationship between the adhesive layer between the end face of the pressure-resistant shell and the adhesive layer between the cylinder faces,the design model of the thickness of the U-shaped adhesive end face adhesive layer and the thickness of the cylindrical adhesive layer is given,and four adhesive structure schemes are proposed;Based on the ballast penetration path,a static seal and water seepage prevention structure for the pressure chamber port and carbon fiber pressure shell are designed.Secondly,the finite element analysis model of the pressure chamber was established to obtain the stress and distribution of the head,U-shaped sleeve,connector and carbon fiber cylindrical shell under the working pressure,and the bonding structure scheme and the volume compression of the pressure chamber were determined.The deformation equation of the amount with the dive depth;the eigenvalue buckling analysis of the composite cylindrical shell was performed to check its stability;with the help of Workbench and Opti SLang,a set of optimized frames for the carbon fiber cylindrical shell was established to lay the carbon fiber.The layer method has been optimized to reduce the number of shell fiber layers by 32,reduce the overall thickness of the pressure bulkhead by 16.84%,and reduce the failure factor by 16.7%.Finally,a water pressure experiment was carried out on the carbon fiber composite pressure hull,and the bonding structure was optimized for the leakage problem.Through the pressure hull compression experiment,the accuracy of the finite element calculation of the pressure hull compression was tested,as The calculation of UG buoyancy compensation provides a basis.The designed and developed composite material deep sea UG was tested in the sea.From the perspective of design parameters,performance indicators,energy consumption and voyage,it was compared with the aluminum alloy deep sea UG with the same diving depth to verify the feasibility of the composite material pressure hull And reliability,and its superiority compared with traditional aluminum alloy pressure cabin in improving the performance of underwater glider.This paper provides a certain theoretical and practical basis for the application of composite materials in submersibles.The fiber layup parameters of the composite pressure shell at a depth of 4000 meters are proposed,and the design model and bonding of the end surface adhesive layer and the cylindrical adhesive layer are given.Structural design method. |
