盘绕式伸展机构非线性屈曲模式的试验研究与数值仿真

Experimental Investigation and Numerical Simulation on Nonlinear Buckling Mode of Coil-able Mast

针对盘绕式伸展机构在轨工作的特点,对其在不同钢丝绳预紧力和机构高度下的非线性屈曲模式和屈曲载荷开展了相关的试验研究。根据其几何非线性特点,采用弧长法对试验状态下结构的非线性屈曲模式进行了仿真分析。研究结果表明:(1)数值仿真计算得到的屈曲模式和屈曲载荷与试验结果一致;(2)伸展机构的屈曲模式与钢丝绳预紧力和机构高度密切相关,处于张紧状态的钢丝绳可显著提高伸展机构的轴压、弯曲承载能力。分析结果也为其他同类机构的设计和试验提供了参考依据。

According to the on-orbit working characteristic of the coil-able mast structure,the experimental investigation on the nonlinear buckling mode and the buckling load at different height and diagonal cable pre-load is carried out.Based on the geometric nonlinearity characteristic,the corresponding numerical simulation is developed by using arc-length method to obtain the nonlinear buckling mode of the structure.The analysis results show that：（1）the buckling mode and the buckling load obtained from numerical simulation agree well with those obtained from the experimental work,（2）the buckling mode of coil-able mast is closely correlative to its height and diagonal cable pre-load,and the bearing capability for the axial compression and bending can be significantly improved if the diagonal cable is under the tension condition.The result is expected to provide some valuable information for studying other similar structures in future.