Wrinkles greatly affect the performance of projection screens.However,there are few studies on the wrinkle problem of large membrane structures.Based on the bifurcation buckling theory,a finite ele-ment model of screen was built and simulated.Various methods were introduced to improve the conver-gence and accuracy of the model.The causes of wrinkles were analyzed by several simulation cases.It is found that the lack of fixation on both sides generates the crescent winkles on edges while the horizontal deformation of the bottom edge leads to radial wrinkles in middle area of screen.The simulation and meas-ured results fit well on amplitude,period and shape.Finally,a wrinkle-free screen structure is designed.The wrinkles are reduced successfully with the new design.
关键词
薄膜结构/褶皱/屈曲/有限元模拟
Key words
membrane structure/wrinkle/buckling/finite element method
维普
万方数据