Surface And Stress Analysis And Splicing Analysis For Membrane Reflector Antenna

Recently,membrane reflector is one of the new type reflector,it is a layer of aluminum material on the surface of the flexible film,then the membrane reflector can reflect electromagnetic waves in the space.Due to the low surface density,high surface accuracy and high strength of the membrane reflector,it is more and more favored by developers.Membrane reflector can be used in space deployable antennas,membrane reflector antenna have the advantages of light weight,high precision and large diameter,which are highly valued by all countries in the world.In order to break through some key technologies of membrane reflector.In this thesis,the theory of membrane reflector geometry forming,cutting and splicing methods are studied.Details and results are shown as follows:(1)In order to meet the design requirements of large diameter,light weight and high precision for membrane reflector antenna,we focus on the problem of surface analysis under the working condition of Membrane reflector.Firstly,based on the principle of nonlinear finite element of membrane structure,programming for analyzing of membrane structure,then,form finding analysis of sliding surface and rotating surface to verify the feasibility of the program.Based on the thin membrane theory,the shape of the membrane reflector in the working state is analyzed.(2)We focus on the analysis of undevelopable membrane reflector which is made by cutting and splicing,we emphasize on the analysis of the flattening and splicing of the membrane reflector.Firstly,based on non-linear finite element program,flattening analysis of the membrane reflector which aperture is 0.55 m,then we have flattened strip plane membrane.Verify the stability and efficiency of the two flattening algorithms.Then,making of a membrane reflector spliced from 12 film cuts.Finally,splicing analysis of plane cutting piece,getting the relationship between the number of cutting pieces and the precision of the membrane reflector.(3)Membrane reflector has different fixing methods,we establish a fixed-type and skirt-type boundary fixed forms,and optimize it.Firstly,based on the electrode optimization model,the developed finite element analysis program is used to optimize the shape of the surrounding fixed membrane reflector,adjust the electrode voltage value,and obtain a membrane reflector with high precision.Then,based on the non-linear finite element principle of the cable membrane structure,the cable membrane structure analysis program was developed,and a saddle-shaped cable membrane structure was analyzed by the compiled program to verify the feasibility of the program.Finally,based on the electrode optimization model,using the developed cable-membrane structure analysis program,the film-shaped membrane reflector of the skirt is optimized for shape and surface,and the membrane reflector with uniform stress distribution is obtained.