折叠结构的主从自由度分析

MASTER/SLAVE FREEDOM ANALYSIS FOR FOLDABLE STRUCTRES

折叠结构在建筑和航天工业有着广泛的应用前景，已经引起人们极大的兴趣。本文利用主从自由度概念分析了剪式单元真实的力学模型，并推导了混合坐标下剪式单元的刚度矩阵和自由振动方程。最后，介绍了折叠结构和有限元分析软件SAP的接口程序的编制和功能。算例表明，该分析方法是正确的。

Foldable structures have been of increasing interest for engineers in recent years. The real mecheanics model of pantographs is analyzed with master/slave freedom technique in this paper The element stiffness matrix of pantograph and the free vibration equations under hybrid coordinate are derived. The interface program with the FEM software, SAP, is introduced. Numerical examples show that the present method is correct.