环形柔性结构四点悬吊设计方法及试验研究

Four-Point Suspension Design Method and Vibration Test for a Hoop Flexible Structure

提出环形柔性结构的四点悬吊设计方法,并进行了模态试验研究。在环形结构地面试验前,设计悬吊装置的三维模型进行力学分析,先建立静平衡方程,增加变形协调条件,求解多个悬吊电机的输入电压和输出安培力。再应用有限元分析,计算结构的固有频率和静态变形。最后,制作缩比模型的四点悬吊装置并进行振动测试。悬吊试验结果表明:悬吊电机对应的电压值和理论分析一致。模态测试结果表明:悬吊前后固有频率接近,证明了悬吊装置的准确性,为航天器柔性结构多点悬吊装置的设计提供了理论依据和试验支撑。

a four-point suspension method of hoop flexible structure is proposed,and modal test is carried out.Before the ground test of hoop flexible structure,the three-dimensional model of suspension device is designed for mechanical analysis. Firstly,the static balance equation is established in consideration of the deformation coordination condition,and the input voltage and output ampere force of multiple suspension motors are solved. Then,the natural frequency and static deformation of the structure are calculated by the finite element analysis. Finally,the four-point suspension device of scale model is fabricated to test. The results of suspension test show that the voltage of suspension motor is consistent with the value of theoretical analysis. The modal test results show that the natural frequencies before and after suspension are close,which proves the accuracy of the suspension device. In a word,it provides theoretical basis and experimental support for the design of multi-point suspension device of spacecraft flexible structure.