An Efficient Optimal Planning and Control Framework for Quadrupedal Locomotion

Farbod Farshidian1, Michael Neunert1, Alexander Wayne Winkler1, Gonzalo Javier Rey2, Jonas Buchli1

  • 1ETH Zurich
  • 2Moog Inc.

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Category

Regular Papers

Sessions

09:55 - 11:10 | Tue 30 May | Room 4111 | TUA2

Optimization and Optimal Control

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Abstract

In this paper, we present an efficient Dynamic Programing framework for optimal planning and control of legged robots. First we formulate this problem as an optimal control problem for switched systems. Then we propose a multi--level optimization approach to find the optimal switching times and the optimal continuous control inputs. Through this scheme, the decomposed optimization can potentially be done more efficiently than the combined approach. Finally, we present a continuous-time constrained LQR algorithm which simultaneously optimizes the feedforward and feedback controller with time-complexity of $O(n)$. In order to validate our approach, we show the performance of our framework on a quadrupedal robot. We choose the Center of Mass dynamics and the full kinematic formulation as the switched system model where the switching times as well as the contact forces and the joint velocities are optimized for different locomotion tasks such as gap crossing, walking and trotting.

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