Numerical Simulation Analysis On The Deformation And The Stress Of Inflated Membrane Structure

The deformation of the balloon airship under loads of air-inflated orgravity suspended will affect the balloon airship aerodynamic performanceand flight control capacity, including the balloon’s shape and its volume.Based on these perceptions, this article took a research on the deformationof airship under the loads of air-inflated and gravity suspended to establishan effective method with numerical simulation analysis.Firstly, method of calculating the balloon model of airship had beendetermined by Michel transferring rules and ABAQUS, one of thecommercial finite element software, had been used as the basic calculatingtool. The FEM model had been established by simplifying the materialsparameters and boundary conditions. Based on the elastic mechanics andthe theory of FEM, the theory calculating methods of FEM and usingconditions of membrane elements was given. Then in order to determinethe effectiveness of FEM comparing the results, comparisons of the finiteelement analysis and theoretical analysis on examples had been given.Secondly, problems appeared on the process of FEM calculating werecollected, such as the balloon of airship appearing offset, fold phenomenonand calculating converging errors etc., Effective methods to these problem were proposed. Meanwhile ABAQUS was used to simplify the loadprocedure with its concept of analysis step.Finally, the calculating results of the balloon airship deformation hadbeen analyzed and the deformation rules of balloon of airship under loadsof air-inflated and suspended gravity were summarized with FEM. Thenresults obtained by experiments and calculating methods were contrastedso as to check the validity of the analytical method. Then the stress resultsunder different loads were analyzed to determine the regular pattern ofstress distribution on airship balloon.