膜结构初始几何形状模拟与有限元前处理

本文介绍了以ＡｕｔｏＣＡＤ为支撑软件，进行膜结构初始几何曲面模拟和有限元数据前处理计算机辅助设计系统。该系统采用ＡｕｔｏＬＩＳＰ语言，编制了具有确定功能的宏命令，通过用户菜单文件，建立了层次式的菜单命令。由于在ＡｕｔｏＣＡＤ环境下运行，该系统可准确模拟任何形状的边界条件。并采用二级曲面网格划分法，自动划分单元提取节点信息，形成面向有限元分析程序的数据。由于运用了ＣＡＤ图形交互技术和数学自动处理，膜结构几何形状模拟与有限元前处理既形象又具有自动化。

INITIAL GEOMETRY SIMULATION AND FINITE ELEMENT ANALYSIS PREPROCESSING OF MEMBRANE STRUCTURE

In this paper,a computer-aided design system for the initial geometry simulation and the FEM analysis data processing of membrane structure is presented by use of the Auto CAD as a support software.in this system,macro-commands of different functions in Auto LISP computer larguage have been compiled.By user's menu.file hierarchical menu commands have been made.As running under,Auto CAD enviroment. the sysytem can simulate arbitrary boundary conditions.The FEM meshing and nodal information, along with the input data for FFM analpsis program. are obtained automatically by making use of two step mesh division Since the CAD interactive technique and mathematicprocessing are included in the system, the initial geometry simulation and FEM front data processing can be done visually and automatically.