Airship Thylakoid Geometric Nonlinear Finite Element Analysis

Airships, as a kind of suspending aircraft, have been widely used in the civil and military fields. The airship gasbag is a typical of membrane structure. In the cases of pitching and steady swerve, gasbag deformation conform the deformation rule of thin plate. During the analysis of aero craft structures, software of international popularity and authorization, such as NASTRAN, ANSYS, ALGOR, COSMOSM, ADINA, have the abilities of solving nonlinear problem.The paper's engineering background was Non-rigid airship gasbag in two operating modes. Chapter 1 presented the histories of airship and nonlinear finite element method. Chapter 2 introduced the fundamental of geometrically nonlinear finite element method and solution methods. In the end of the chapter the bending of rectangular plate is solved, and linear result is compared with nonlinear one. It find that nonlinear solution is more precise than linear one. Chapter 3 discussed all loads in two operating modes in detail. After finishing the finite element model, pitching case was analyzed. The nonlinear and linear finite element results were gained finally. On the base of Chapter 2 their results were compared again. Limit to the length of the chapter, steady swerve case were solved only to obtain precise nonlinear finite element result. In the article two operating modes analysis were finished, and consulted for experimentation.