本文推导了拉维娜式行星齿轮变速器的运动特性方程。
This paper derives the motion property equation for Ravigneaux planetary transmission.
而物体原来的运动状态是变速运动。
速度：一个物体运动的方向和速率。或者是在某一位置的变速率。
Velocity: the speed and direction of an object, or its rate of change in position.
运动速度可采用恒速，也可以通过步进电机控制变速运动方式。
The speed can be constant or be changed by the controlling of step motor.
匀变速运动是恒力作用的结果吗？
Is the motion with even variable velocity the result of constant force?
本文提出了变速箱运动学的数学模型。
The author has put forward a mathematical model of kinematics for tractor gearbox.
本文提出了变速箱运动学的数学模型。
The author has put forward a mathematical model of kinematics for tractor gearbox.
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