浮空器囊体材料的气密性研究

The Gas Tightness Study of Aerostat Envelope Material

浮空器产品的一个重要技术指标是囊体气密性。为了对产品实际加工后的囊体材料气密性进行研究,模拟实际加工工况,对Vectran、尼龙、聚酰亚胺三种不同织物为承力层的囊体材料本体揉搓前后及片幅之间连接处的透氦率进行测试,分析了透氦率变化情况。结果表明:囊体材料透氦率随着揉搓次数及热合缝隙面积增加而增大,含外热合条的缝隙处透氦率与本体材料相当。该结果可用于指导囊体材料的选择、产品的加工及整体泄漏量的评估。

The gas tightness of envelope material is one of the important technicalities of aerostat products.In order to study the gas tightness of materials after processing,three materials with bearing layer made of Vectran,nylon and polyimide fabric were chosen as the research objects,and processing parameters here was consistent with the actual working conditions.The helium permeability of materials that were original,after being used and the joint position were tested.The variation of helium permeability was further analyzed.The research results show that the helium permeability of envelope material increases with the increase of kneading times and the area of sealing gap.Besides,the helium permeability of the gap containing the external hot strip is equivalent to that of the bulk material.This study could guide the choice of materials,the product processing and the assessment of overall leakage.