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research-article

Exponential Stabilization of Fully Actuated Planar Bipedal Robotic Walking with Global Position Tracking Capabilities

[+] Author and Article Information
Yan Gu

School of Mechanical Engineering, Purdue University, West Lafayette, Indiana 47906
gu49@purdue.edu

Bin Yao

School of Mechanical Engineering, Purdue University, West Lafayette, Indiana 47906
byao@purdue.edu

C. S. George Lee

School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47906
csglee@purdue.edu

1Corresponding author.

ASME doi:10.1115/1.4038268 History: Received February 19, 2017; Revised October 19, 2017

Abstract

This paper focuses on the development of a model-based feedback controller to realize high versatility of fully actuated planar bipedal robotic walking. To conveniently define both symmetric and asymmetric walking patterns, we propose to use the left and the right legs for gait characterization. In addition to walking pattern tracking error, a biped's position tracking error in Cartesian space is included in the output function in order to enable high-level task planning and control such as multi-agent coordination. A feedback controller based on input-output linearization and proportional-derivative control is then synthesized to realize exponential tracking of the desired walking pattern as well as the desired global position trajectory. Sufficient stability conditions of the hybrid time-varying closed-loop system are developed based on the construction of multiple Lyapunov functions. In motion planning, a new method of walking pattern design is introduced, which decouples the planning of global motion and walking pattern. Finally, simulation results on a fully actuated planar biped showed the effectiveness of the proposed walking strategy.

Copyright (c) 2017 by ASME
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