| Buckling easily appeared in nonrigid airship since it is a typical inflated thin wall structure. Thermal environment of the near space is complex and varies dramatically during a day, resulting in thermal concentration and wrinkling and even damage of the airship. Thus, bending-wrinkling analysis of the airship is of importance and guiding significance.A multi-scale model is established to make numerical simulations on developing and expending of wrinkles of the inflated beam under three point bending. The influence of interface connection and fine component length is analyzed and an optimized modeling method is obtained.Wrinkling test of the inflated beam under three point bending is conducted. Numerical results show good agreement with the experimental solution, which reveals the accuracy and efficeiency of multi-scale method. Thereotical prediction is performed, based on which wrinkling area length, wrinkling angle and bending stiffness is given. Load-displacement curve of the wrinkled infalted beam is certified and then verified by the experiment.Element stiffness matrix deducing based on transfer matrix of the varying cross-section beam was completed. Then this deducing method was applied to element stiffness matrix of non-uniformly varied cross-section beam. Element stiffness matrix of tapered elements was obtained and used to validate the accuracy and high effficiency of this method. A multi-sacle method of the airship was developed and the critical buckling load and failure load is got through large deformation, nonlinear, bending analysis.The models of temperature, pressure, solar radiation and earth radiation were respectively established. Transient and static temperature analysis of the airship was conducted and the change law of temperature field was clerified. Then influence of the Photovoltaic cells on wrinkling characteristics was investigated. Finally wrinkling analysis of the airship considering thermal influence was conducted and related conclusion was presented. |
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