Quasi optimal sagittal gait of a biped robot with a new structure of knee joint
TypeArticles dans des revues avec comité de lecture
The design of humanoid robots has been a tricky challenge for several years. Due to the kinematic complexity of human joints, their movements are notoriously difficult to be reproduced by a mechanism. The human knees allow movements including rolling and sliding, and therefore the design of new bioinspired knees is of utmost importance for the reproduction of anthropomorphic walking in the sagittal plane. In this article, the kinematic characteristics of knees were analyzed and a mechanical solution for reproducing them is proposed. The geometrical, kinematic and dynamic models are built together with an impact model for a biped robot with the new knee kinematic. The walking gait is studied as a problem of parametric optimization under constraints. The trajectories of walking are approximated by mathematical functions for a gait composed of single support phases with impacts. Energy criteria allow comparing the robot provided with the new rolling knee mechanism and a robot equipped with revolute knee joints. The results of the optimizations show that the rolling knee brings a decrease of the sthenic criterion. The comparisons of torques are also observed to show the difference of energy distribution between the actuators. For the same actuator selection, these results prove that the robot with rolling knees can walk longer than the robot with revolute joint knees.
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HOBON, Mathieu; LAKBAKBI EL YAAQOUBI, Nafissa; ABBA, Gabriel (AFM, 2011)L’article présente la méthodologie d’obtention de trajectoires optimales de marche pour une nouvelle classe de robot bipède. Le robot bipède est constitué de sept corps et possède des genoux anthropomorphes avec un contact ...
HOBON, Mathieu; LAKBAKBI EL YAAQOUBI, Nafissa; ABBA, Gabriel (Elsevier, 2011)In this paper, we address the problem of optimization of trajectories for a new class of biped robot. The knees of this biped are similar as the anthropomorphic one and have a rolling contact between the femur and the ...
HOBON, Mathieu; LAKBAKBI EL YAAQOUBI, Nafissa; ABBA, Gabriel (2013)The knee of biped robots has usually one degree of freedom which one is a revolute joint. This work focuses on the study of rolling contact knee. The knee is composed of a cylinder in the extremity of the femur, rolling ...
HOBON, Mathieu; LAKBAKBI EL YAAQOUBI, Nafissa; ABBA, Gabriel (IEEE, 2013)This paper presents the energy consumption of a biped robot with a new modelled structure of knees which is called rolling knee (RK). The dynamic model, the actuators and the friction coefficients of the gear box are known. ...
HOBON, Mathieu; LAKBAKBI EL YAAQOUBI, Nafissa; ABBA, Gabriel (Laboratoire de Conception Fabrication Commande (LCFC), 2013)This report presents the dynamic modeling of a planar biped robot. The robot has seven bodies and 9 DOF. Two kinematic configurations are investigated. The first has only revolute joints on all articulation. The second ...