Experimental Validation of the Essential Model for a Complete Walking Gait with the NAO Robot
Author:
Marquez-Acosta Emanuel1ORCID, De-León-Gómez Victor1ORCID, Santibañez Victor1ORCID, Chevallereau Christine2ORCID, Aoustin Yannick2ORCID
Affiliation:
1. Tecnológico Nacional de México/I.T. La Laguna, División de Estudios de Posgrado e Investigación, Blvd. Revolución y Cuahutémoc S/N, Torreón C.P. 27000, Coahuila, Mexico 2. Laboratoire des Sciences du Numérique de Nantes (LS2N), UMR CNRS 6004, 1 rue de la Noe, 44300 Nantes, France
Abstract
In this paper, for the first time, experimental tests of complete offline walking gaits generated by the essential model are performed. This model does not make simplifications in the dynamics of the robot, and its main advantage is the definition of desired Zero Moment Point trajectories. The designed gaits are implemented in the NAO robot, where starting and stopping stages are also included. Simulations in MATLAB and Webots, and experiments with the real robot are shown. Also, important remarks about the implementation of walking trajectories in the NAO robot are included, such as dealing with the hip joint shared by both legs. A comparison between the linear inverted pendulum (LIP) model and the essential model is also addressed in the experiments. As expected, the robot fails following the offline gait generated by the LIP model, but it does not with the essential model. Moreover, in order to push the boundaries of the essential model, a complex gait is designed with a vertical motion of the center of mass and an abrupt movement of the arms. As shown in experiments, no external balance controller is required to perform this complex gait. Thus, the efficiency of the essential model to design stable open-loop complex gaits is verified.
Reference36 articles.
1. Kajita, S., Kanehiro, F., KaneKo, K., Yokoi, K., and Hirukawa, H. (November, January 29). The 3D linear inverted pendulum mode: A simple modeling for a biped walking pattern generation. Proceedings of the 2001 IEEE/RSJ International Conference on Intelligent Robots and Systems. Expanding the Societal Role of Robotics in the the Next Millennium, Maui, HI, USA. 2. Pratt, J., Carff, J., Drakunov, S., and Goswami, A. (2006, January 4–6). Capture point: A step toward humanoid push recovery. Proceedings of the 2006 6th IEEE-RAS International Conference on Humanoid Robots, Genova, Italy. 3. Kajita, S., Kanehiro, F., KaneKo, K., Fujiwara, K., Harada, K., Yokoi, K., and Hirukawa, H. (2003, January 14–19). Biped walking pattern generation by using preview control of zero-moment point. Proceedings of the 2003 IEEE International Conference on Robotics and Automation, Taipei, Taiwan. 4. The spring-mass model for running and hopping;Blickhan;J. Biomech.,1989 5. Goswami, A., and Vadakkepat, P. (2018). Gait based on the spring-loaded inverted pendulum. Humanoid Robotics: A Reference, Springer.
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