我们探讨了弱聚焦磁场中带电粒子轴向和径向运动的稳定性问题，得到稳定性条件。
We discussed the stability of both radial movement and axis movement of charged particle in infirm focusing magnetic field and obtained the term of stability.
轴向运动和编码器之间的轴和驱动轴偏差(径向和角向偏移)进行补偿的耦合。
Axial motion and misalignment (radial and angular offset) between the encoder shaft and the drive shaft are compensated by the coupling.
在降落伞轴向和径向动量方程的基础上进行一些合理的简化，并结合其他经验公式基本描述了降落伞整个充气阶段的运动过程。
The parachute axis of symmetry equation and radial equation were rationally simplified. Integrated with other experienced formulas, the movement process of parachute inflation was described.
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