YP Planetary Gear is designed to assist teachers and students when they study the working of a planetary gear train. (this software is not related in any way with astronomy). A planetary gear train is a mechanism consisting of an assembly of meshed gears: the sun gear, the planet carrier, and the ring gear. The automatic transmission in an automobile uses the planetary gear train to transmit power from the engine to the wheels at various controllable speeds and torques. The transmission of power is varied by locking one or the other of the three gears. With YP Planetary Gear, you may observe the motion of a planetary gear train when one of its parts is locked. The program also calculates the ratio of the angular velocities when one of its parts is locked.

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