详细介绍了主动转向系统的结构和组成，以及核心部件双行星齿轮机构的工作原理及工作模式。
The structure and makeup of active steering system, the operating principle and operating mode of dual planetary gear mechanism are introduced in detail.
利用周转轮系的转化机构推导出空间周转轮系行星轮转速计算公式，并阐述行星轮转向的判定方法。
For calculating the rotating speed of planetary gear in space turnover gear trains, a formula is derived by applying the transforming mechanism of turnover gear trains.
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