在进行飞机易损性分析时，需要计算飞机及各部件在垂直于来袭方向的投影面积。
In aircraft vulnerability analysis, it is necessary to calculate the projection areas of the aircraft and its critical components facing against the attacked direction.
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.
最后利用模型计算了初始充气阶段伞衣形状变化、伞衣投影面积变化及伞绳张力。
Finally, the model is used to calculate the variations of canopy shape, the variations of canopy projection area and the tension of suspension lines during initial inflation phase.
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