充气式气动减速器的折叠方法及充气过程数值仿真  

A Folding Method of Inflatable Aerodynamic Decelerator and Numerical Simulation of Inflation Process

作　　者：赵晓舜 余莉[1,2] 杨雪[1] ZHAO Xiaoshun;YU Li;YANG Xue(Key Laboratory of Aircraft Environment Control and Life Support of Ministry of Industry and Informatization Technology,Nanjing,210016,China;College of Aerospace Engineering,Nanjing University of Aeronautics&Astronautics,Nanjing,210016,China)

机构地区：[1]南京航空航天大学飞行器环境控制与生命保障工业和信息化部重点实验室,南京210016 [2]南京航空航天大学航空学院,南京210016

出　　处：《南京航空航天大学学报》2020年第6期948-956,共9页Journal of Nanjing University of Aeronautics & Astronautics

基　　金：国家自然科学基金面上(11972192)资助项目;江苏高校优势学科建设工程资助项目。

摘　　要：针对充气式气动减速器难以建立折痕有序、径向压缩的折叠模型,本文提出了分割映射折叠方法。首先基于分割映射技术得到分割展平面;其次通过矩阵变换将分割展平面转换为连续的几何折叠模型;最后,采用初始应力修正了建模过程中的模型误差,降低了充气过程中的应力集中和网格畸变问题。数值结果表明:充满的单圆环的表面积和体积误差仅为1.8%,验证了本文折叠方法的高精度;充气式气动减速器的初始和充满外形与实验外形一致,展开过程稳定、有序,说明该方法的可靠性和适用性。本文折叠方法适用于任意旋转曲面的多维压缩和有序折叠,提高了曲面展开数值仿真的精确度和稳定性。Aiming at the problem that the inflatable aerodynamic decelerator(IAD)is difficult to establish a folding model with regular folds and radial compression rate,the segmentation mapping folding(SMF)method is proposed in this paper. Firstly,flattened planes are obtained by using the segmentation mapping technique. Then the segmented planes are transformed into a continuous geometric folding model by using the matrix transformation. Finally,the initial stress is used to modify the model errors during folding process,which can reduce the problems of stress concentration and mesh distortions during inflation process.Numerical results show that surface area and volume errors of the inflated single torus are only 1.8%,demonstrating the high precision of SMF method. The initial and the full shapes of the IAD are consistent with those of the experimental,and the inflation process is stable and orderly,demonstrating the reliability and applicability of SMF method. The proposed folding method can be used in the multidimensional compression and regular folding of any surface of revolution,and also improves the accuracy and stability of the surface inflation numerical simulation.

关 键 词：人机与环境工程 充气式气动减速器 折叠建模 初始应力修正 数值仿真 

分 类 号：V475[航空宇航科学与技术—飞行器设计]