Buckling Analysis And Optimal Design Of Grid Stiffened Revolving Shells

This paper first briefly introduces the development and application of gridstiffened revolving shell and its characteristics on structure and performance, thenreview the research results in recent years on size optimization of grid stiffenedrevolving shell structure. Based on the finite element software ANSYS platform, byusing parametric programming languages to establish a three-dimensional finiteelement analysis model to optimize the stability performances of grid stiffenedrevolving shell structure, the main work and conclusions are as follows:Grid-stiffened cylindrical shells which composed of periodical grid cells andcylindrical thin skin are numerical analyzed for stability based on the parameterizedmodeling method. Three periodical grids, i.e., ortho-grid, orthotropic-grid, iso-grid,are choose to study the influences of the cell numbers, cell configurations, skinthickness and stiffener size variation on the critical buckling loads and modes ofcylindrical shell, under uniform material volume. Numerical results reveal that thereare optimal cell number and related cell configurations, which match cylindrical shelldimensions, to maximize the critical buckling load. And the structural criticalbuckling loads normally arise at transitional area between global buckling mode andlocal buckling mode for lateral pressure load case.Aim at stiffened angle optimization problem of the lateral pressure grid stiffenedconical shell, by using aspect ratio of single cell to describe stiffened angle, toanalysis and compared the influence of stability stiffened angle on the bucklingbehavior of three periodical grid stiffened conical shell, i.e., ortho-grid,anisotropic-grid, triangular-grid. The results reveal that under the condition of thelocal buckling, with the increase of skin volume, bigger stiffened angle is often withbetter buckling performance, and under the condition of constant volume, the beststiffened angle of the anisotropic-grid stiffened conical shell is bigger than the otherkinds of grid stiffened conical shell; under the condition of the overall buckling, withthe increase of skin volume, smaller stiffened angle is often with better bucklingperformance, and under the condition of constant same volume, the best stiffenedangle of the triangular-grid stiffened conical shell is bigger than the other kinds of gridstiffened conical shell.Regard the ratio of load to mass as the performance index of buckling, Three periodical grid stiffened conical shells, i.e., ortho-grid stiffened conical shells,anisotropic-grid stiffened conical shells, triangular-grid stiffened conical shells, arechoose to study the buckling behavior of grid stiffened conical shells for lateralpressure load case. Firstly, enumeration analysis is used to study the of a singlestructure parameters influences of stiffened conical shells. The results reveal that theheight of stiffened has the most influence on the the buckling behavior of gridstiffened conical shells than the other structure parameters. On the basis ofenumeration analysis,study the minimum weight of grid stiffened conical shells forthe given loads case. The results show that with the increase of loads, rise velocity ofthe weight of triangular-grid stiffened is the lowest, triangular-grid stiffened conicalshells has the highest efficiency than the other kinds of grid stiffened conical shells.