Bio-inspired step-climbing in a hexapod robot

Inspired by the observation that the cockroach changes from a tripod gait to a different gait for climbing high steps, we report on the design and implementation of a novel, fully autonomous step-climbing maneuver, which enables a RHex-style hexapod robot to reliably climb a step up to 230% higher than the length of its leg. Similar to the climbing strategy most used by cockroaches, the proposed maneuver is composed of two stages. The first stage is the 'rearing stage,' inclining the body so the front side of the body is raised and it is easier for the front legs to catch the top of the step, followed by the 'rising stage,' maneuvering the body's center of mass to the top of the step. Two infrared range sensors are installed on the front of the robot to detect the presence of the step and its orientation relative to the robot's heading, so that the robot can perform automatic gait transition, from walking to step-climbing, as well as correct its initial tilt approaching posture. An inclinometer is utilized to measure body inclination and to compute step height, thus enabling the robot to adjust its gait automatically, in real time, and to climb steps of different heights and depths successfully. The algorithm is applicable for the robot to climb various rectangular obstacles, including a narrow bar, a bar and a step (i.e. a bar of infinite width). The performance of the algorithm is evaluated experimentally, and the comparison of climbing strategies and climbing behaviors in biological and robotic systems is discussed.

[1]  Jonathan E. Clark,et al.  iSprawl: Design and Tuning for High-speed Autonomous Open-loop Running , 2006, Int. J. Robotics Res..

[2]  R J Full,et al.  Distributed mechanical feedback in arthropods and robots simplifies control of rapid running on challenging terrain , 2007, Bioinspiration & biomimetics.

[3]  Pei-Chun Lin,et al.  Bio-inspired step crossing algorithm for a hexapod robot , 2011, 2011 IEEE/RSJ International Conference on Intelligent Robots and Systems.

[4]  R E Ritzmann,et al.  Characterization of obstacle negotiation behaviors in the cockroach, Blaberus discoidalis , 2009, Journal of Experimental Biology.

[5]  J. T. Watson,et al.  Control of climbing behavior in the cockroach, Blaberus discoidalis. II. Motor activities associated with joint movement , 2002, Journal of Comparative Physiology A.

[6]  Daniel E. Koditschek,et al.  Sensor data fusion for body state estimation in a hexapod robot with dynamical gaits , 2005, IEEE Transactions on Robotics.

[7]  Roger D. Quinn,et al.  Mechanized cockroach footpaths enable cockroach-like mobility , 2004, IEEE International Conference on Robotics and Automation, 2004. Proceedings. ICRA '04. 2004.

[8]  R. Full,et al.  Dynamics of rapid vertical climbing in cockroaches reveals a template , 2006, Journal of Experimental Biology.

[9]  Daniel E. Koditschek,et al.  A framework for the coordination of legged robot gaits , 2004, IEEE Conference on Robotics, Automation and Mechatronics, 2004..

[10]  Gilbert L. Peterson,et al.  The latest generation Whegs™ robot features a passive-compliant body joint , 2008, 2008 IEEE/RSJ International Conference on Intelligent Robots and Systems.

[11]  Daniel E. Koditschek,et al.  Sensor data fusion for body state estimation in a hexapod robot with dynamical gaits , 2006, IEEE Trans. Robotics.

[12]  N. Cowan,et al.  Task-level control of rapid wall following in the American cockroach , 2006, Journal of Experimental Biology.

[13]  A. Biewener,et al.  Negotiating obstacles: running kinematics of the lizard Sceloporus malachiticus , 2006 .

[14]  Carlos A. Navas,et al.  Evolution of jumping capacity in Tropidurinae lizards: does habitat complexity influence obstacle‐crossing ability? , 2007 .

[15]  Christopher G. Atkeson,et al.  Optimization and learning for rough terrain legged locomotion , 2011, Int. J. Robotics Res..

[16]  Louis-François Pau,et al.  Sensor data fusion , 1988, J. Intell. Robotic Syst..

[17]  Mark R. Cutkosky,et al.  Stride Period Adaptation of a Biomimetic Running Hexapod , 2004, Int. J. Robotics Res..

[18]  K H Low,et al.  Parametric study of the swimming performance of a fish robot propelled by a flexible caudal fin , 2010, Bioinspiration & biomimetics.

[19]  Roy E. Ritzmann,et al.  Control of obstacle climbing in the cockroach, Blaberus discoidalis. I. Kinematics , 2002, Journal of Comparative Physiology A.

[20]  Jonathan E. Clark,et al.  Stride Period Adaptation for a Biomimetic Running Hexapod , 2001, ISRR.

[21]  Stefan Schaal,et al.  Learning, planning, and control for quadruped locomotion over challenging terrain , 2011, Int. J. Robotics Res..

[22]  Daniel A. Kingsley,et al.  Parallel Complementary Strategies for Implementing Biological Principles into Mobile Robots , 2003, Int. J. Robotics Res..

[23]  Daniel E. Koditschek,et al.  RHex: A Simple and Highly Mobile Hexapod Robot , 2001, Int. J. Robotics Res..

[24]  M. Nahon,et al.  A trajectory tracking controller for an underwater hexapod vehicle , 2008, OCEANS 2008.

[25]  Daniel E. Koditschek,et al.  A leg configuration measurement system for full-body pose estimates in a hexapod robot , 2005, IEEE Transactions on Robotics.

[26]  Roger D. Quinn,et al.  Insect-like Antennal Sensing for Climbing and Tunneling Behavior in a Biologically-inspired Mobile Robot , 2005, Proceedings of the 2005 IEEE International Conference on Robotics and Automation.

[27]  Martin Buehler,et al.  Reliable stair climbing in the simple hexapod 'RHex' , 2002, Proceedings 2002 IEEE International Conference on Robotics and Automation (Cat. No.02CH37292).

[28]  Shaoping Bai,et al.  Kinematographic experiments on leg movements and body trajectories of cockroach walking on different terrain , 2000, Proceedings 2000 ICRA. Millennium Conference. IEEE International Conference on Robotics and Automation. Symposia Proceedings (Cat. No.00CH37065).

[29]  J. Okada,et al.  The role of antennal hair plates in object-guided tactile orientation of the cockroach (Periplaneta americana) , 2000, Journal of Comparative Physiology A.

[30]  R J Full,et al.  Templates and anchors: neuromechanical hypotheses of legged locomotion on land. , 1999, The Journal of experimental biology.

[31]  R J Full,et al.  How animals move: an integrative view. , 2000, Science.

[32]  Alfred A. Rizzi,et al.  Gaits and gait transitions for legged robots , 2006, Proceedings 2006 IEEE International Conference on Robotics and Automation, 2006. ICRA 2006..

[33]  R J Full,et al.  Neuromechanical response of musculo-skeletal structures in cockroaches during rapid running on rough terrain , 2008, Journal of Experimental Biology.

[34]  J. Camhi,et al.  High-frequency steering maneuvers mediated by tactile cues: antennal wall-following in the cockroach. , 1999, The Journal of experimental biology.

[35]  A Jusufi,et al.  Righting and turning in mid-air using appendage inertia: reptile tails, analytical models and bio-inspired robots , 2010, Bioinspiration & biomimetics.