论文部分内容阅读
前言在宇宙空间飞行的火箭、人造卫星、航天飞机要经历超高真空、失重等特殊环境,因此在地面上有必要进行预备性实验。在地面上用长为20m左右的真空槽做失重实验,也只不过能实现几秒的失重状态。然而在地面上30km的高空处,空气密度大约仅是地表处空气密度的1/100,因之空气阻力也变小,所以由很高的高度落下的物体,就能实现近似于失重的状态。例如,重量100kg、横断面积0.1m~2、摩擦阻力系数约为0.2的物体,由35km高空落下时,可望能实现10~(-3)g
Introduction Rocket, satellite and space shuttle flying in space have to go through special environments such as ultra-high vacuum, weightlessness and so on. Therefore, preparatory experiments on the ground are necessary. On the ground with a length of about 20m vacuum tank weight loss experiment, but also to achieve a few seconds of weightlessness. However, at a height of 30 km above the ground, the density of air is only about 1/100 of the density of the air at the surface. As a result, the resistance to air is also reduced. Therefore, an object falling from a very high height can achieve an approximate weightlessness. For example, the weight of 100kg, the cross-sectional area of 0.1m ~ 2, the friction coefficient of about 0.2 objects, falling from 35km altitude, is expected to be able to achieve 10 ~ (-3) g