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建立充气膜结构初始瘪气状态的折叠模型是进行充气仿真的基础.动态泄气倒塌分析是获取复杂结构初始折叠模型的基本建模方法之一.以气肋膜结构为例,基于控制体积法,研究了有限元分析中单元类型、数量及三种倒塌算法对计算效率、折叠效果及单元变形等的影响.结果表明,三角形膜单元计算耗时少,但计算结果收敛慢;随单元数量上升,计算耗时呈非线性快速增长,收敛效率则呈非线性递减;压应力消除法倒塌计算慢、体积压缩困难、表面积收缩大,不适于建立初始折叠模型;过载法计算快、体积压缩极快、表面积变形极小,可用于建模,但折叠形态不佳;在综合应力消除法和过载法的基础上,提出适于建模的混合法,实现了较优的计算效率和单元变形控制,且折叠形态较自然.
It is one of the basic modeling methods to obtain the initial folded model of complex structure.Firstly, based on the control volume method, The influence of element type, number and three collapse algorithms in finite element analysis on computational efficiency, folding effect and element deformation is analyzed. The results show that the computation time of triangular membrane element is less and the calculation results converge slowly. As the number of elements increases, The time-consuming and non-linear rapid growth, the convergence efficiency is a non-linear decline; compressive stress elimination method collapse slow calculation, volume compression difficult, large surface shrinkage, unsuitable for the establishment of the initial folding model; overload method fast, rapid compression volume, surface area The deformation is extremely small and can be used for modeling, but the folded shape is not good. On the basis of comprehensive stress elimination method and overload method, a hybrid method suitable for modeling is proposed, which achieves better computational efficiency and unit deformation control, Form more natural.