| The Cable-Mesh Deployable Antenna is a kind of space-borne deployable antenna which is light in weight,easy to fold,high in precision and easy to realize large aperture,and it is the main type of space-borne deployable antenna currently on orbit.Cable-Mesh Deployable Antenna involves a wide range of technical fields and the research on them is endless.This thesis has conducted in-depth research on many key techniques of it such as the initial equilibrium design,the update of finite element model and the profile design in thermal environment.The main work can be described as follows:1.Based on the force density method and the nonlinear finite element method,the initial equilibrium design of the cable-membrane-beam composite structure of the Cable-Mesh Deployable antenna is carried out.Firstly,the force density equilibrium equation of the cable-membrane structure is established,and the corresponding form-finding iterative solution strategy is given.Then,considering the deformation of the deployable support truss will affect the accuracy of the antenna reflector surface,the stiffness equation of the cablemembrane-beam composite structure was derived based on the results of the cablemembrane form-finding,a form-finding iterative solution strategy was proposed.Finally,simulation examples is given to demonstrate the effectiveness of the method.2.Updated the finite element model of Cable-Mesh Deployable Antenna based on the thermal experiment.Considering the thermal deformation of the deployable truss joint will affect the accuracy of the antenna reflector surface,the finite element model of the truss joint was established firstly,and the joint material parameters were updated according to the results of thermal experiment.Then,simplified the finite element model of the joint and reduced the number of joint elements,updated the structure of the simplified finite element model based on static analysis.Finally,the accuracy of the antenna reflector surface of prototype was measured and adjusted by high precision photogrammetry equipment,and the finite element model of the antenna was updated based on the thermal experiment of the antenna prototype,obtained a satisfactory result.3.Proposed a form-finding method for Cable-Mesh Deployable Antenna,which consider on-orbit thermal effect.First simulated the thermal environment of the satellite on-orbit,calculated the temperature field of the antenna in typical orbit.Then calculated the thermal deformation of antenna orbiting,studied the change of the antenna reflector surface accuracy.Finally,a method of Cable-Mesh Deployable Antenna form-finding design on-orbit is proposed with ANSYS,after the form-finding design,the accuracy of antenna reflector surface is improved,and the on-orbit performance is improved. |
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