Thermal Analysis Of Space Inflatable Deployment Sclerosis Film Antenna Structures

Space inflatable deployment film antenna is widespread concern by aerospace engineers because it has significant features such as light weight, high package ratio, high reliability and low cost. And it is currently in the stage of basic technology domestic. When the antenna is in space orbit, drastic temperature gradient and severe temperature variation in the structure will induce much big thermal stress and thermal deformation. Ill-conditioned thermal equilibrium temperature will reduce its life, and even cause fault. Thermally induced deflections of reflector have much effect on the electric performance of antenna. Therefore, thermal-structural analysis is very important for such structure to maintain its high thermal stability.Firstly, the theory of thermal analysis is introduced briefly. The heat load, shadow orbit, temperature field principle and antenna design method is described. The analysis model of space inflatable deployment film antenna is built, including reflector, rear canopy and skirt. After solar radiation heat, earth radiation heat, earth reflection heat and earth shadow is considered, the temperature field of different sun positon in Low Earth Orbit (LEO) and Geosynchronous Earth Orbit (GEO) are calculated respectively. And the results are compared and evaluated comprehensively.Secondly, the load files are wrote on the basis of thermal analysis results. A method of thermal-structural analysis is developed. And thermal stress and thermal deformation analysis of space inflatable deployable film antenna are carried out sequentially. According to the reflector results, the surface error is calculated and evaluated. Finally, a construction paraboloid inflatable film antenna is introduced. Then the basic procedure of cutting design method is delivered, and the analysis model of paraboloid inflatable film antenna is built, including reflector, rear canopy, skirt and trous. The initial surface error analysis is performed. According to the method of thermal-structural analysis, the temperature field, thermal stress and thermal deformation analysis of paraboloid inflatable film antenna in LEO are carried out. And the error of surface compared with undevelopable surface is calculated.