Toward an adaptive foot for natural walking

Many walking robot presented in literature stand on rigid flat feet, with a few notable exceptions that embed flexibility in their feet to optimize the energetic cost of walking. This paper proposes a novel adaptive robot foot design, whose main goal is to ease the task of standing and walking on uneven terrains. After explaining the rationale behind our design approach, we present the design of the SoftFoot, a foot able to comply with uneven terrains and to absorb shocks thanks to its intrinsic adaptivity, while still being able to rigidly support the stance, maintaining a rather extended contact surface, and effectively enlarging the equivalent support polygon. The paper introduces the robot design and prototype and presents preliminary validation and comparison versus a rigid flat foot with comparable footprint and sole.

[1]  David Hill,et al.  Effects of a powered ankle-foot prosthesis on kinetic loading of the contralateral limb: A case series , 2013, 2013 IEEE 13th International Conference on Rehabilitation Robotics (ICORR).

[2]  Guy Bessonnet,et al.  Forces acting on a biped robot. Center of pressure-zero moment point , 2004, IEEE Transactions on Systems, Man, and Cybernetics - Part A: Systems and Humans.

[3]  E. Westervelt,et al.  Feedback Control of Dynamic Bipedal Robot Locomotion , 2007 .

[4]  Kenji KANEKO,et al.  Humanoid robot HRP-3 , 2004, 2008 IEEE/RSJ International Conference on Intelligent Robots and Systems.

[5]  Jun-Ho Oh,et al.  Mechanical design of humanoid robot platform KHR-3 (KAIST Humanoid Robot 3: HUBO) , 2005, 5th IEEE-RAS International Conference on Humanoid Robots, 2005..

[6]  Antonio Bicchi,et al.  Modelling natural and artificial hands with synergies , 2011, Philosophical Transactions of the Royal Society B: Biological Sciences.

[7]  Marko B. Popovic,et al.  Ground Reference Points in Legged Locomotion: Definitions, Biological Trajectories and Control Implications , 2005, Int. J. Robotics Res..

[8]  John Kenneth Salisbury,et al.  Contact Sensing from Force Measurements , 1990, Int. J. Robotics Res..

[9]  Nikolaos G. Tsagarakis,et al.  WALK-MAN humanoid lower body design optimization for enhanced physical performance , 2016, 2016 IEEE International Conference on Robotics and Automation (ICRA).

[10]  Qiang Huang,et al.  Flexible foot design for a humanoid robot , 2008, 2008 IEEE International Conference on Automation and Logistics.

[11]  Atsuo Takanishi,et al.  Realization of biped walking on uneven terrain by new foot mechanism capable of detecting ground surface , 2010, 2010 IEEE International Conference on Robotics and Automation.

[12]  Yoshihiko Nakamura,et al.  ZMP Support Areas for Multicontact Mobility Under Frictional Constraints , 2015, IEEE Transactions on Robotics.

[13]  A. Najmuddin,et al.  Experimental development of stiffness adjustable foot sole for use by bipedal robots walking on uneven terrain , 2012, 2012 IEEE/SICE International Symposium on System Integration (SII).

[14]  Hicks Jh.  The mechanics of the foot: II. The plantar aponeurosis and the arch , 1954 .

[15]  Nikolaos G. Tsagarakis,et al.  The design of the lower body of the compliant humanoid robot “cCub” , 2011, 2011 IEEE International Conference on Robotics and Automation.

[16]  Manuel G. Catalano,et al.  Adaptive synergies for the design and control of the Pisa/IIT SoftHand , 2014, Int. J. Robotics Res..

[17]  Darwin G. Caldwell,et al.  The design of an anthropomorphic dexterous humanoid foot , 2010, 2010 IEEE/RSJ International Conference on Intelligent Robots and Systems.

[18]  Byung-Ju Yi,et al.  Modeling and analysis of a biomimetic foot mechanism , 2009, 2009 IEEE/RSJ International Conference on Intelligent Robots and Systems.

[19]  Bram Vanderborght,et al.  Passive Ankle-Foot Prosthesis Prototype with Extended Push-Off , 2013 .

[20]  G. Whitesides.  Soft Robotics. , 2018, Angewandte Chemie.

[21]  Johannes Sobotta,et al.  Sobotta atlas of human anatomy : head, neck, upper limb, thorax, abdomen, pelvis, lower limb , 2008 .

[22]  Kouhei Ohnishi,et al.  Stability index for biped robot moving on rough terrain , 2009 .

[23]  Clément Gosselin,et al.  Underactuated Robotic Hands , 2008, Springer Tracts in Advanced Robotics.

[24]  Pierre Blazevic,et al.  Mechatronic design of NAO humanoid , 2009, 2009 IEEE International Conference on Robotics and Automation.

[25]  Kazuhito Yokoi,et al.  Biped walking pattern generation by using preview control of zero-moment point , 2003, 2003 IEEE International Conference on Robotics and Automation (Cat. No.03CH37422).

[26]  Alena M. Grabowski,et al.  Bionic ankle–foot prosthesis normalizes walking gait for persons with leg amputation , 2012, Proceedings of the Royal Society B: Biological Sciences.

[27]  Jessy W. Grizzle,et al.  Preliminary walking experiments with underactuated 3D bipedal robot MARLO , 2014, 2014 IEEE/RSJ International Conference on Intelligent Robots and Systems.