柔性伞衣织物的自由变形折叠建模及其充气机制研究

doi:10.13475/j.fzxb.20200704107

纺织学报 ›› 2021, Vol. 42 ›› Issue (07): 108-114.doi: 10.13475/j.fzxb.20200704107

柔性伞衣织物的自由变形折叠建模及其充气机制研究

张思宇¹, 余莉¹(), 贾贺¹^,², 刘鑫¹

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, 江苏南京 210016
2.北京空间机电研究所, 北京 100094

收稿日期:2020-07-17 修回日期:2021-03-10 出版日期:2021-07-15 发布日期:2021-07-22
通讯作者: 余莉
作者简介:张思宇(1995—),男,博士生。主要研究方向为柔性织物建模与流固耦合分析。
基金资助:
国家自然科学基金项目(11972192);江苏省研究生科研与实践创新计划项目(KYCX20_0216);南京航空航天大学研究生拔尖创新人才培养“引航计划”跨学科创新基金项目(KXKCXJJ202001)

Free form deformation modeling method and inflation mechanism of folded canopy fabrics

ZHANG Siyu¹, YU Li¹(), JIA He¹^,², LIU Xin¹

1. Key Laboratory of Aircraft Environment Control and Life Support, MIIT, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 210016, China
2. Beijing Institute of Space Mechanics & Electricity, Beijing 100094, China

Received:2020-07-17 Revised:2021-03-10 Published:2021-07-15 Online:2021-07-22
Contact: YU Li

摘要/Abstract

摘要：

为解决冲压翼伞充气耦合计算中柔性伞衣织物的折叠建模这一关键技术难题,根据柔性伞衣真实的物理折叠特点,引入自由变形思想,提出针对多气室柔性伞衣织物的展向折叠建模方法。采用直接约束型曲面变形技术,通过控制节点移动实现曲面变形,基于坐标矩阵变换对柔性伞衣织物进行展向压缩折叠;并用初始应力方法修正几何误差,使折叠模型具有初始本构力学特征。对翼伞柔性伞衣织物建立展向折叠模型,基于任意拉格朗日-欧拉方法进行充气过程的流固耦合计算,得到充气过程中结构动力学变化及非稳态流场的分布情况,与空投实验进行对比分析,证明了基于自由变形的新型柔性伞衣织物折叠建模方法的准确性与可行性。

关键词: 充气式柔性织物, 柔性伞衣织物, 翼伞, 自由变形, 充气机制, 流固耦合, 折叠建模

Abstract:

Folded flexible canopy fabrics of ram-air parachutes modeling is a key problem in the interaction calculation during inflation process. According to physical folding characteristics, a modeling method of folded canopy fabrics was proposed based on free form deformation. The wing surface deformation was achieved by moving control nodes with direct constraint method of free form deformation. The spanwise folding was obtained by coordinate matrix transformation. In order to modify the geometric errors, the initial stress method was introduced to make the folded model with mechanical characteristics. The folded canopy fabrics model of a certain ram-air parachute was established using this method, and the fluid-structure interaction calculation was carried out based on the arbitrary Lagrange-Euler method during inflation process. The three-dimensional shape, stress and unsteady flow field distribution were obtained. The corresponding calculation and airdrop experiment verified the rationality and feasibility of this method.

Key words: inflatable flexible fabric, folded canopy fabric, ram-air parachutes, free form deformation, inflation mechanism, fluid-structure interaction, fold modeling

中图分类号:

TS101.8

张思宇, 余莉, 贾贺, 刘鑫. 柔性伞衣织物的自由变形折叠建模及其充气机制研究[J]. 纺织学报, 2021, 42(07): 108-114.

ZHANG Siyu, YU Li, JIA He, LIU Xin. Free form deformation modeling method and inflation mechanism of folded canopy fabrics[J]. Journal of Textile Research, 2021, 42(07): 108-114.

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名称	厚度/m	横截面积/m²	弹性模量/Pa	密度/ (kg·m^-3)
伞衣	0.035	—	4.3×10⁸	533.77
伞绳	—	9.0×10^-6	9.7×10¹⁰	462.00

柔性伞衣织物的自由变形折叠建模及其充气机制研究

Free form deformation modeling method and inflation mechanism of folded canopy fabrics

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