Initial geometry configuration optimization of space inflatable membrane reflector

For large inflatable space reflector made by membrane, analysis and control of the shape precision are key technologies. At first, the concept of two kinds of configuration is introduced in this paper. Geometrical nonlinear FEA model is utilized to predict the stress and deformation of membrane reflector surface. Shape optimization model based on genetic algorithm method is developed to define the initial geometry configuration of reflector membrane pieces. For verification the optimization method and results, a 6m diameter inflatable membrane parabolic reflector model made by Kapton HN membrane is developed. Results revealed that the precision has been improved but still not achieve the optimization results. It needs to combine with experiment condition to modify model and optimization strategy. A series of suggestions is introduced and the precision impact factors of experimental model are studied by numerical analysis, which is beneficial in optimization analysis.