大型反射面的充气展开动力学研究

为了掌握大型反射面从收拢状态到完全展开状态的动力学特性，采用气囊模型和控制体积(CV)法对反射面的充气展开过程进行研究。建立了包含中心轮毂、肋板、支撑杆、薄膜圆环和张拉绳的反射面有限元模型，提出逆解法获得折叠收拢状态下反射面的节点坐标，给出了充气展开动力学分析流程，获得了恒定充气速率下展开过程中圆环充气体积、环内压力等参数与展开时间的变化规律。结果表明，采用充气技术可进行大型反射面有序可控展开，反射面的充气展开过程分初始收拢状态、解锁释放、肋板展开、保压稳定四个阶段，地面充气展开试验结果验证了仿真分析的准确性。

Inflation Deployment Dynamics Analysis on Large Reflector

In order to obtain the dynamic characteristics of large-scale reflector from the folded state to the full deployment state, the airbag model and control volume (CV) method are employed for the inflation deployment of reflector. The finite element models of inflatable antenna including central hub, ribs, supporting tubes, membrane torus and tension ropes are established, an inverse method for the node coordinates of the reflector in the fold state is proposed, the flowchart for analyzing the dynamic deployment process is given, and the relationships between the torus inflation volume and inner gas pressure with deployment time under constant inflation gas velocity are acquired. The results indicate that, it is feasible to use the inflation gas technology for deploying large-scale reflector, with the inflation deployment process including four stages, i.e. initial folded stage, unlocking constrains and releasing stage, inflating and deploying stage, and maintaining shape with pressure stage. The ground inflation deployment experimental testing results validate the process of simulation.