Episodic Learning for Safe Bipedal Locomotion with Control Barrier Functions and Projection-to-State Safety

Posted on May 21, 2021

Overview

Learning a residual term on a dynamics model to ensure safety via barrier functions.

Abstract

This paper combines episodic learning and control barrier functions in the setting of bipedal lo- comotion. The safety guarantees that control barrier functions provide are only valid with perfect model knowledge; however, this assumption cannot be met on hardware platforms. To address this, we utilize the notion of projection-to-state safety paired with a machine learning framework in an attempt to learn the model uncertainty as it affects the barrier functions. The proposed approach is demonstrated both in simulation and on hardware for the AMBER-3M bipedal robot in the context of the stepping-stone problem, which requires precise foot placement while walking dynamically.

Paper