Executive Summary : | The aim of this project is to Design and Development of the Self-Deployable Ultra-Light Weight Adaptive Inflatable Structures. This research work going to be dispersed in three major study Wrinkling, Vibration and Shape Control using all Analytical, Numerical and Experimental approach. Control optimization of surface error is one the fundamental requirements of space based membrane structures. Prediction and Control of the surface error due to different dynamics and static behaviour of membrane structures is a key aspects of the analyses. Structural wrinkling is a common phenomenon found in thin membranes when subjected to different loading and boundary conditions. These structures are often partially wrinkled and the formation of wrinkles drastically alters load paths and structural stiffness within the membrane. A better understanding of the effects of wrinkles on the structural performance and stability of these structures is essential and desirable. Analytical and numerical studies of the wrinkling analysis of flat membranes provide a natural way of approaching this field. The predictive and preventive methods must be developed for flat membranes and then applied to predict and control the wrinkling behaviour of a deployable membrane structure. The wrinkled membrane vibrates along equilibrium position of wrinkle configuration. Based on the Lagrange equation, the differential equation of vibration will be established for wrinkled membrane. The vibration modes of wrinkled membrane are strongly correlated with wrinkle configurations. Local stiffness of wrinkle wave peaks is larger because of large stress. Vibration frequency apparently increases with wave peak vibration. With the wrinkle out-of-plane deformation, the natural frequency of vibration changes in oscillation. The active vibration control analysis will be carried out using linear quadratic regulator (LQR) and the control mechanism will analysed. The procedure of making actual (fabricated) parabolic membrane with ideal parabolic shape with flat pieces of the membrane will be examined. This will cover the cutting pattern analysis and optimization of number of gores in the membrane with respect to seaming and central cap size. The effect of pressure variation in shape error and sensitivity of the reflector are also discussed. Shape selection of planar polygon membrane depends upon two factors, surface error and maximum principal stress present in the structures. |