15.4 : 绝对运动分析-一般平面运动

Imagine a propelling drone hovering in the air. The motion of a drone can be analyzed using the principle of general planar motion.

As the propellers of the drone begin to rotate, the drone lifts off and moves along a straight path, undergoing a translational motion.

Once airborne, any point on the drone, for example, point P, is in motion. The movement of point P describes a curved path. This path arises from the combination of curvilinear translational and rotational motion, resulting in general planar motion.

The drone's translational motion during the flight consists of forward or backward movements as well as rising or falling. Furthermore, its rotational motion consists of pitch, yaw, and roll around the three axes of rotation.

This complex motion results from the simultaneous effect of rotational motion around the drone's center of gravity and translational motion driven by its propellers.

When the drone touches down, the rotational and translational motions halt, and the general planar motion ends, causing point P to rest.