考虑桁架柔性的可展开天线动力学分析

Dynamic Analysis of Deployable Antennas Considering Truss Flexibility

周边桁架式可展开天线的展开过程涉及复杂的动力学问题,对天线展开过程的研究有助于展开天线的设计、研制和优化。综合考虑天线展开过程中桁架结构的柔性变形和索网结构的变拓扑特征,建立了周边桁架式可展开天线展开过程的动力学模型。首先采用绝对节点坐标法的梁单元对外桁架结构建模,然后引入过渡函数来描述索段由松弛到张紧状态的转变,最后建立了周边桁架可展开天线的系统动力学方程。对天线进行动力学仿真分析,结果表明该方法能有效地分析天线的展开过程,桁架结构在内部索网张力的作用下会产生柔性变形,对驱动力和展开速度产生显著的影响。

The deployment of the hoop truss deployable antenna involves complex dynamics problems, and the research on the deployment is helpful to the design, development and optimization of the antenna. Considering the flexible deformation of the truss structure and the variable topology of the cable-net structure during the deployment, the dynamic model of the hoop truss deployable antenna is established. Firstly, the beam element of the absolute node coordinate formulation is used to model the external truss structure, and then a transition function is introduced to describe the transition of the cable segment from relaxation to tension, finally, the dynamic equation of hoop truss deployable antenna is established. The simulation results show that the method can effectively analyze the deployment of the antenna, and the flexible deformation of the truss structure under the tension of the internal cable net has a significant impact on the driving force and deployment velocity.