By the limit probability theory, it is shown that the closed-loop system is almost surely uniformlystable, and the control law is asymptotically optimal.
利用概率极限理论，证明了闭环系统的几乎必然一致稳定性和控制律的渐近最优性。
2
Two or four oil wedges uniformly spaced on the circumference hold the rotor in a stable position.
转子周边均匀分布的两个或者是四个油楔是转子处于一个稳定的位置。
3
Some common error sources probably exist in a large region. Instruments should be distributed as uniformly as possibly in order to establish a stable reference system.