伞衣

基于LS-DYNA的降落伞伞衣织物透气性参数仿真验证

The Use of LS-DYNA to Simulate the Permeability Parameters of the Parachute Canopy

其次，以C-9伞为算例进行模型验证，将计算得到的降落伞充气过程中的投影面积、充满距离以及充气过程中伞衣外形变化等关键性能参数与试验结果进行对比。

Then , the inflation process is verified by numerical simulation with C-9 parachute , key performance parameters , such as projected area , full inflation distance and canopy deformation during inflation , are compared with test results .

伞绳和伞衣处理成非线性弹性构件。

The radial members and gores are regarded as non linear elastic materials .

降落伞伞衣透气量对着陆损伤率之影响

The Effect of Parachute Porosity on Parachute Landing Injuries

在落地最后一刹那时，保持你伞衣在充饱状态。

Landing ends when your wing is packed .

不同透气性的伞衣织物与降落伞的发展

Difference Permeability Parachute Fabrics and Development of Parachutes

降落伞伞衣织物的设计特点

Design Feature of Parachute Canopy Fabric

考虑伞衣中线上的子午向应力，得到了一个双轴应力模型。

The meridional stress in the gore centerline is considered , and a biaxial stress model is got .

当主提带上金属部分温度较高时，不要与伞衣接触。

When the temperature is high metal parts of the risers should not get in touch with the wing .

本文依据降落伞的使用，叙述了降落伞伞衣织物的主要设计要求及其组织结构和相关的工艺特点。

In this paper , main design demand and stitch structure and correlation technology feature about parachute canopy fabric is related .

在载人飞船某些批次的空投试验中，出现主伞伞衣的个别伞衣幅撕裂、灼伤等局部破损。

In some airdrop tests of manned spacecraft , local damage was observed in the main parachute canopy , such as tearing , thermal burning .

接着介绍了伞系统的建模方法，重点讨论了主伞衣的模型和降落过程的实现。

Then , it introduces the modeling method of the parachute system , emphasizes the model of the main cloths and the realization of the landing process .

将充满的伞看成柔软的壳体，用力学原理建立伞绳（伞衣上径向加强带）和伞衣幅中线的力平衡方程。

The canopy under inflation is regarded as a soft shell , and the equilibrium equations in the radial member and gore centerline are established by mechanics theorems .

在改变伞衣面积和透气量的情况下，在定常风洞中对小型平面圆形伞的开伞过程进行了动态试验，研究了开伞过程中伞衣形状和伞衣所受载荷之间的动态关系。

The opening process of the circle flat parachute with the differential size and the differential vent position of the canopy by the steady flow wind tunnel were dynamic tested .

根据降落伞的特点，通过伞衣零厚度假设、伞轴对称假设和流场定常假设，建立轴对称降落伞的流体力学计算模型。

According to the characteristics of parachute , based on 0-thickness assumption of canopy , axisymmetric assumption of parachute , and steady assumption of flowfield , a fluid dynamics computational model was established .

建立的尾流再附动力学模型包括：伞系统运动方程、尾流运动方程、伞衣-尾流动量交换方程。

The model includes three parts : equations of the motion for the parachute-store system , equations of the motion for the wake , equations of the momentum transfer between parachute and wake .

定义对称面圆周角，保持伞衣幅底部直径和顶孔直径不变，选取对称面圆周角在80°~140°范围内变化，建立一系列轴对称降落伞的计算模型。

After the circular angle in symmetric plane was defined and diameters of parachute bottom and top vent were kept invariable , a series of fluid dynamics computational model were established over circular angle range of 80 °~ 140 ° .

文章根据降落伞的特点，通过3点假设（伞衣的薄膜假设、降落伞的轴对称假设和流场的定常假设），将三维复杂流动问题，转化成二维轴对称问题，以节约计算时间。

According to the characteristics of parachute , based on three assumptions ( membrane assumption of canopy , axisymmetric assumption of parachute , and steady assumption of flowfield ) , the 3-D complex flow problem was first transformed into an axisymmetric problem with computational timesaving .

研究结果表明，牵顶伞和剥离带能够减小抽打速度、抽打幅度和抽打弧度，改善伞绳和伞衣的张力分布，有效抑制抽打现象的发生。

The results indicated that the attached apex drogue and peel off band could minish the velocity , range and radian of bull whipping , reform the distribution of tensile force in the lines and canopy , and restrain the forming of bull whipping phenomenon effectively .