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空间伸展臂是广泛应用的航天结构．本文分析了正八面体单元伸展臂的构成原理；推导出展开过程的运动轨迹和滑动－转动单元的两种９×９刚度矩阵；建立了在预应力和外载下的受力分析模型．本文中介绍并分析了４４００ｍｍ高馈源支撑架结构方案．
Space extension arm is a widely used aerospace structure. In this paper, the formation principle of the extended arm of the octahedron element is analyzed. The two 9 × 9 stiffness matrices of the unfolding process and the sliding-rotating element are deduced. The stress analysis model under the prestress and the external load is established. This article describes and analyzes the 4400mm high feed support structure program.