Pyramid System Of Double Layer Cylindrical Reticulated Shell Shape Optimization And Stability Analysis

Reticulated shell is a bar decorate, according to certain rule through the nodes are linked together, both shell and characteristic of structure of bar system, single bar type, easy installation, high efficiency and good economic benefit, is advantageous for the industrialization production, reasonable stress nature, stiffness big, small weight, amount of steel, elegant, with vivid artistic expression and appeal.Pyramid according to different forms of meshing, the common system of double layer cylindrical reticulated shell are:four cones cylindrical reticulated shell is put, time is put four cones cylindrical reticulated shell, board type four cones cylindrical reticulated shell, diagonal is put four cones cylindrical reticulated shell, the three pyramid cylindrical reticulated shell and took three pyramid cylindrical reticulated shell six types. This article main work includes:1. Using ANSYS software with APDL parametric design language, developed a system of six kinds of typical pyramid parametric design of double layer cylindrical reticulated shell/modeling the macro program, gives relevant pyramid system under different macroscopic geometric parameters, the model of double layer cylindrical reticulated shell This kind of double layer cylindrical reticulated shell is given macro geometry parameters and micro geometric relation; Standardized production, the processing for this kind of cylindrical reticulated shells design provides convenient maintenance and optimization.2. The application of ANSYS software, the six kinds of typical pyramid system of double layer cylindrical reticulated shell structure stress analysis, to study the macroscopic geometric parameters (span, rise, length, mesh count, thickness, etc.) change of the cylindrical reticulated shell the influence law of mechanical properties, obtain some conclusion of engineering application value. 3. Using FORTRAN language shape optimization program and ANSYS, double layer cylindrical reticulated shell of six kinds of pyramid system for the shape optimization. In double layer cylindrical reticulated shell structure, a given span S structure, high vector direction grid number m, F, span length direction of the grid number n. Change net shell structure corresponding geometric parameters, can get different structure forms of net shell node coordinates, then the corresponding node coordinates as variables, the shape optimization design. By changing the geometric parameters to realize the optimization of different structure forms of net shell, seek to minimize the objective function value, the total weight of structure shape and size shape.4. The application of ANSYS software is put four of the optimized pyramid cylindrical reticulated shell buckling analysis and geometrical nonlinear analysis, get the pyramid load-displacement curve of the whole process response of the cylindrical reticulated shell graph, table, for a comprehensive understanding of pyramid system stability and ultimate bearing capacity of double layer cylindrical reticulated shell laid a foundation.