Z形折叠薄膜充气管充气展开过程仿真

Simulation of Inflation Deployment of Z-Folded Membrane Tube

展开过程仿真是评估空间充气折叠结构展开力学行为的重要工具,仿真结果可以进一步指导折叠方案和展开构型的设计改进。笔者基于控制体积法和有限元法,建立了多次Z形折叠充气管的有限元模型,阐明了折叠管充气展开仿真计算的基本原理和建模处理方法。通过对比研究不同充气速率条件下充气管在展开过程中各参数的动态变化规律,表明充气速率是影响Z形折叠充气管展开性能中至关重要的因素。充气速率越快,展开越快捷。但充气速率过高,展开过程对母体的扰动力也越大,并且带来展开后期管体自身的严重振荡。适当选择充气速率,可以有效降低扰动载荷峰值,并且有利于展开后期管体自身振荡的迅速衰减。适当增加充气管薄膜的厚度,虽然增加了对母体的扰动力,但可以有效降低管体展开后期的振荡速度。

The deployment simulation of folded inflatable antenna beam is an important means for assessing inflatable deployment behavior in space environment and for guiding and improving future packaging and deployment concepts.Based on the control volume method,the finite element model of Z-folded membrane tube is established.Analysis and comparison of different inflation rates are conducted to investigate the deployment dynamic properties.The simulation results show that inflation rate is a vital factor which affects the deployment dynamic properties.A high inflation rate reduces the deployment time,but the disturbing force applied on the master structure will increase,and lead to a serious tube swing in the subsequent deployment process.A proper inflation rate can reduce the peak value of disturb force and result in a quicker attenuation of tube swing.Moreover,the membrane thickness has some effect on deployment stabilization of inflatable tube.By choosing a reasonable membrane thickness,the swing amplitude in the deployment process can be effectively reduced.