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对可变几何桁架（ＶＧＴ）结构展开运动学和动力学进行了系统分析。基于约束方程得到了运动学分析的递推公式；并利用Ｄ＇Ａｌｅｍｂｅｒｔ原理推导了ＶＧＴ展开的动力学方程；这些公式和方程简洁并具有规律性，适于计算机编程计算，通过算例分析验证了方法的可行性。
The kinematics and dynamics of a variable geometry truss (VGT) structure are systematically analyzed. Based on the constraint equation, the recursive formula of kinematic analysis is obtained. The kinetic equations of VGT are deduced by D’Alembert’s principle. These equations and equations are concise and regular, which are suitable for computer programming and calculation. Feasibility of the method.