Authors:
José R. Puga
1
;
Filipe M. Silva
2
and
Boaventura R. da Cunha
3
Affiliations:
1
Polytechnic Institute of Porto, Portugal
;
2
University of Aveiro, Portugal
;
3
University of Trás-os-Montes e Alto Douro, Portugal
Keyword(s):
Legged robots, Biped locomotion, Online planning, Interaction forces.
Related
Ontology
Subjects/Areas/Topics:
Informatics in Control, Automation and Robotics
;
Mobile Robots and Autonomous Systems
;
Modeling, Simulation and Architectures
;
Robotics and Automation
Abstract:
This paper presents a motion planning and control method with application in the field of legged robots. The general aim is to explore a set of simple underlying principles that govern balance of posture and gait of biped robots, and to develop control methodologies for such a highly unstable and non linear plants. The proposed controller reflects a hierarchical structure based on the interaction forces between the foot and ground and simple feedback rules used online. The algorithms are applied to a simulated 3-D leg model with five degrees of freedom (DOF). The simulation analyses demonstrate the capability of the control system to keep balance when the leg executes different tasks. To validate the proposed method several aspects are investigated, such as the posture robustness on the level ground when subject to external perturbations, the adaptation when standing in a moving platform and the improvements introduced by the compensation of the tangential reaction forces.