如果真的遇到主伞问题，我们需要切掉主伞，打开备份伞。
If you really have the main umbrella, we need to cut off the main umbrella, open the parachute.
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.
主伞的顶部开有“天窗”，“天窗”的上端罩有副伞，副伞的上端压有弹簧。
The main umbrella has trap door on the top, the secondary umbrella covers the trap door, and the spring presses the secondary umbrella.
分析了封包绳提前断裂状态下降落伞系统的运动特性，建立伞舱组合体在拉直阶段的动力学模型，计算了主伞的运动轨迹，分析了拉出的主伞与伞舱口的碰撞情况。
Under the conditions of early rupture of the reefing lines, motion characteristics of parachute system were analyzed, and mathematic model of parachute-capsule system in the deployment was built.
本实用新型公开了一种主杆可弯折的伞，旨在提供一种结构简单、使用方便的主杆可弯 折的伞。
The utility model discloses an umbrella, the trunk of which could be bended, and aims to provide the umbrella with the bended trunk which is simple in structure and easy to use.
飞行员：检查装备…背上主降落伞。
利用模型计算了主充气阶段伞衣形状变化、伞衣投影面积变化及伞绳张力。
The model was used to calculate the variations of the canopy shape, the variations of canopy projection area and the tension of the suspension line during the final inflation phase.
利用模型计算了主充气阶段伞衣形状变化、伞衣投影面积变化及伞绳张力。
The model was used to calculate the variations of the canopy shape, the variations of canopy projection area and the tension of the suspension line during the final inflation phase.
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