大型索网天线结构在轨变形分析及软件研发

针对大型索网天线结构分析存在拉索单元抗拉不抗压引起的本构非线性和大变形引起的几何非线性等难点，基于参变量变分原理和非线性有限元法，开发大型索网天线结构在轨变形分析与预测软件LFAS，实现周边桁架式索网天线结构的参数化建模、静力分析、动力分析以及找形分析等功能；该软件按模块化设计，可以方便地扩展其他功能模块.数值算例表明：LFAS具有更高的收敛性和精度，特别适合大型索网天线结构的高精度分析和控制.

On orbit deformation analysis for large AstroMesh antenna and software development

As to the difficulties during the analysis on large AstroMesh antenna, such as the constitutive nonlinearity caused by the characteristics that the cable elements can only sustain tension and geometric nonlinearity caused by the large deformation of structure, based on parametric variation principle and nonlinear finite element method, a software called LFAS is developed for large on orbit AstroMesh antenna structure deformation analysis and prediction. Some functions of LFAS are implemented, such as parametrization modeling, statics analysis, dynamics analysis, form finding analysis, and so on. The software is developed by modulization and so the other function modules can be extended. The numerical examples prove that, LFAS has higher convergence and accuracy and are especially suitable for high accuracy analysis and control of AstroMesh antenna.