Application of a multilevel model for analysis and synthesis of load-bearing thin-walled structures

A model for evaluating the stress-strain state of thin-walled aircraft frames is considered in the so-called multilevel formulation. As the basic method, the method of finite elements is used. The structure is represented as a sequential set of module components linked by means of generalized displacements. The number of degrees of freedom of the module components is set depending on the design level, beginning with the simplest one. In the course of calculations, the results obtained at preceding levels are used. Numerical results are given.