Robust Footstep Planning and LQR Control for Dynamic Quadrupedal Locomotion

Guiyang Xin, Songyan Xin, Oguzhan Cebe, Mathew Jose Pollayil, Franco Angelini, Manolo Garabini, Sethu Vijayakumar, Michael Mistry

Research output: Contribution to journalArticlepeer-review

Abstract

In this paper, we aim to improve the robustness of dynamic quadrupedal locomotion through two aspects: 1) fast model predictive foothold planning, and 2) applying LQR to projected inverse dynamic control for robust motion tracking. In our proposed planning and control framework, foothold plans are updated at 400 Hz considering the current robot state and an LQR controller generates optimal feedback gains for motion tracking. The LQR optimal gain matrix with non-zero off-diagonal elements leverages the coupling of dynamics to compensate for system underactuation. Meanwhile, the projected inverse dynamic control complements the LQR to satisfy inequality constraints. In addition to these contributions, we show robustness of our control framework to unmodeled adaptive feet. Experiments on the quadruped ANYmal demonstrate the effectiveness of the proposed method for robust dynamic locomotion given external disturbances and environmental uncertainties.
Original languageEnglish
Pages (from-to)4488 - 4495
Number of pages8
JournalIEEE Robotics and Automation Letters
Volume6
Issue number3
Early online date24 Mar 2021
DOIs
Publication statusE-pub ahead of print - 24 Mar 2021

Keywords

  • Legged Robots
  • Whole-Body Motion Planning and Control
  • Motion Control

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