Structure Design Of 5m Deployable Mesh Antenna

Large deployable Astro Mesh antenna, which is attracting more and more attention of space navigation scholars all over the world, is an important type for deployable antenna for satellites. The performance of Astro Mesh is decided by its tension truss form-finding and its ring truss.Firstly, the form-finding method is introduced in the paper, and then aimed at minimizing the principle error of the large reflector, a design method of truss is proposed. Finally, the thermal analysis and model analysis is carried out to Astro Mesh. The main work can be described in details as follows:1. Aimed at minimizing the profile error of the large reflector, a geometric design method for Astromesh antenna is developed. The process is resumed by iteratively changing the force density coefficients until the tension in every cable is same. If the process converges, a uniformly tensioned synclastic cable net with every node exactly on the parabolic surface is computed. This form-finding method lays a solid foundation for the design of the structure of large mesh antenna.2. For the pretension design of the structure of large mesh antenna, the rule of the construction of rigid three-dimensional frameworks was proposed. The methodology of two mesh tension symmetry layout and ellipse truss for improving antenna precision was proposed, the evenly pre-tension distribution of space mesh antenna is achieved. From the perspective of the antenna reflector selection, two methods of reflector interception are studied: the oblique interception method and the vertical interception method. According to the oblique interception method, the equation of interception intersecting line and the evaluation standards of interception intersecting lines flatness are derived. Through the oblique interception method, the nodes located on the boundary have the same coordinate value in vertical direction. Through the vertical interception method, achieve the optimal nodes became possible.3. The thermal analysis of the large mesh antenna was guaranteed that the thermal deformation did not affect it's the requirement of electronic performance. Constant temperature was loaded on all nodes using finite element analysis software of ANSYS. In the same situation, the thermal stability of circular truss mesh antenna was better than ellipse truss mesh antenna.4. In the premise of the same quality and caliber, the rigidity of the two kind mesh antennas were the same by the model analyzing. Modal effective mass is an important parameter to determine the quality of a FEM, and the method could have a certain reference of the FEM modeling of the ordinary structure.