干燥的风积沙对扰动很敏感，现行有关规程中的密度测定方法对其均不太适合。
Because the dry wind-blown sand is sensitive to disturbance, the methods for measuring density in current regulations are not appropriate to it.
为此，设计了大攻角旋转天平支撑系统，此系统可测定飞机模型在不同姿态角下绕风轴以一系列恒定的角速率旋转时的气动特性。
The paper has introduced design of the support system for rotary balance of high attack angle, and the importance and methods of studying spin of aircraft.
在建立芒刺尖到接地极板间电场分布模型的基础上，提出了在电场中悬挂小球测定离子风的方法。
Then the ion wind can be determined by measuring the shift of a suspended ball in the field.
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