Wang Changguo

Simulation Analysis of Vibration Characteristics of Wrinkled Membrane Space Structure

Flexible membrane space structures have received the widest attention due to their small packaging volume and low launching cost, but wrinkles as the common deformation state, are the main failure mode of such structures. They also affect the vibration characteristics which are the main factor of the structural analysis and design. So a better understanding of the vibration characteristics of the wrinkled membrane structure is essential and desirable. In this paper, a modal analysis, incorporating the wrinkling analysis, is presented to model the vibration characteristics of the wrinkled square membrane structure subjected to the asymmetric tension. The effects of the wrinkles on the vibration characteristics of the wrinkled membrane structures are considered in detail. Some important conclusions are also summarized in detail at last. The results of this paper are very important when used in the structural design and optimization of the membrane space structure.

Membrane Buckling Patterns and Secondary Buckling Analysis

In this paper, the shear wrinkles of a rectangular membrane under the pretension were analyzed firstly. A critical shear distance was then obtained based on the tension field theory. An expression between the wavelength and the amplitude of the membrane wrinkles were developed using the Von Karman large deflection formula. The simulation flow of the membrane wrinkles were also established using the nonlinear post-buckling analytical method. The results indicated that the wrinkle was firstly generated on both sides of the membrane and then extended to the center. The wrinkle amplitude increased with the shear distance increases. The wrinkle formation and expansion were effectively resisted by increasing the initial pretension. Buckling mode of the shear membrane was unstable in the post-buckling process and the secondary buckling phenomenon was obviously observed. The theoretical and numerical results were compared to verify the rationality of the theoretical and simulation results.