Abstract

This paper addresses robust landing stabilization in humanoid locomotion on uneven terrain. The core idea is to find a configuration of the robot that results in small impulsive force when an unexpected obstacle is encountered, and to adjust post-contact reference for swing foot with which the pose of the foot is stabilized on the obstacle. This can be achieved by walking with heel strike motion (validated by the impact map analysis) and by employing hybrid admittance control combining the admittance control with reset of post-contact reference, embedded into the momentum-based whole-body control framework. The validity of the proposed algorithm is verified by simulation with a physics engine.

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