For the two-bar robot arm, we focus merely the whole kinetic energy at horizontal condition, and neglect the change of potential energy due to the bending deflection of the robot arm.
对二连杆机器人手臂在水平状态下仅考虑总的动能，而忽略由于手臂挠曲变形而产生的位能变化。
2
With upward decreasing grain size the deflection of the self-potential curve also decreases to form a bell-shape.