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Slip often occurs in humanoid robot walking, especially when the robot walks on a low friction floor or walks fast. Unexpected slip may cause the robot to fall and then sustain damage. In real environments, rotational and translational slip phenomena can happen during biped walking. Previous studies have mainly focused on solving these problems independently. In this paper, we propose strategies for simultaneous rotational and translational slip prevention based on a three mass model, which takes into account the effect of the swing leg. The rotational slip is prevented through a bionic walking pattern generator which mimics the yaw moment compensation mechanism of a human. The translational slip is eliminated through a novel reaction force ratio reduction control with the compensation of CoM (center of mass) acceleration. The effectiveness of the presented strategies is validated by simulations and experiments with an actual humanoid robot.

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This paper proposes a disturbance rejection controller using real-time ZMP (Zero Moment Point) regulation which could maintain the stable walk of a humanoid robot when the robot is subjected to external disturbances. The controller detects the disturbance by an accelerometer, and computes the ZMP increment to overcome disturbance to ensure stability, and then calculate the increment of trajectory of center of mass according to ZMP increment using preview control. The