Experimental evaluation of a trajectory/force tracking controller for a humanoid robot cleaning a vertical surface

The task of cleaning a vertical flat surface with the help of a standing humanoid robot is considered. A trajectory/force tracking controller is introduced that is implemented under a mixed position/torque control mode. The arm joints are controlled with a conventional PD controller working under position control, while the ankle joints are torque controlled. The desired force is realized via a force tracking controller using CoM and ZMP position readings obtained from the pressure sensors in the feet. The trajectory/force tracking controller is implemented and experimentally evaluated with a miniature humanoid robot HOAP-2.