环形桁架式空间薄膜展开机构运动精度可靠性建模与分析

Motion accuracy reliability modeling and analysis of an annular truss space membrane deployable mechanism

空间薄膜展开机构的姿态和位置精度会对薄膜索网的工作形态产生影响。文章首先构建环形桁架式空间薄膜展开机构运动精度可靠性理论模型,然后基于ADAMS建立考虑展开机构杆长误差的参数化仿真模型,并采用蒙特卡罗法对展开机构进行运动精度可靠性仿真分析,求解运动精度可靠度。结果表明,以机构展开到位时折展杆支撑点所拟合的空间圆心坐标位置误差及半径误差作为其运动精度可靠性量化评价指标是正确的。该研究可为空间薄膜展开机构的可靠性设计提供参考。

The attitude and position accuracy of the space membrane deployable mechanism will affect the working pattern of the membrane cable network.In this paper,a theoretical model of motion accuracy reliability of the annular truss space membrane deployable mechanism was constructed,and a parametric simulation model considering the rod length error of the deployable mechanism was established based on ADAMS.The motion accuracy reliability simulation analysis of the deployable mechanism was carried out by Monte Carlo method to solve the motion accuracy reliability.The results indicate that it is correct to take both the spatial circle center coordinate position error and the radius error,fitted by the supporting points of the foldable rod of the fully deployed annular truss space membrane deployable mechanism,as the quantitative index for evaluating the motion accuracy reliability.The research may provide a reference for the reliability-based design of space membrane deployable mechanism.