Reaction forces identification of a quadruped robot with parallel-serial leg structure

Interactions between feet and environment influence the stability and mobility of legged robot. This paper proposes a model to indirectly identify 3 degrees of freedom feet reaction forces for a quadruped robot with parallel-serial legs. The research platform is called Baby-Elephant: a heavy-duty four-legged robot designed for nuclear plant maintenance and disaster relief purposes. Each leg has three hydraulic actuators. With the pressure data from pump and hydraulic actuators, a double-chamber model with experimental derived friction is used to obtain the actuated force. The reaction forces model, including joint and foot forces, is simplified into an explicit function. Comparison between CAD simulation and analytical results shows the effectiveness of the model. A walking experiment with load cells proves the model is validate in practical application. The proposed model is used to identify the foot contact phase and the zero momentum point during crawling gait walking.

[1]  A. Biewener,et al.  Running over rough terrain: guinea fowl maintain dynamic stability despite a large unexpected change in substrate height , 2006, Journal of Experimental Biology.

[2]  W. E. van den Brom,et al.  Ground reaction force analysis of large breed dogs when walking after the amputation of a limb , 2000, Veterinary Record.

[3]  Yasuhiro Fukuoka,et al.  Adaptive Dynamic Walking of a Quadruped Robot on Irregular Terrain Based on Biological Concepts , 2003, Int. J. Robotics Res..

[4]  Joel E. Chestnutt,et al.  An actuator with physically variable stiffness for highly dynamic legged locomotion , 2004, IEEE International Conference on Robotics and Automation, 2004. Proceedings. ICRA '04. 2004.

[5]  Richard Bloss.  Robot walks on all four legs and carries a heavy load , 2012 .

[6]  Kevin Blankespoor,et al.  BigDog, the Rough-Terrain Quadruped Robot , 2008 .

[7]  D. Schmitt,et al.  Force plate for measuring the ground reaction forces in small animal locomotion. , 2006, Journal of biomechanics.

[8]  M. Ernst,et al.  Humans integrate visual and haptic information in a statistically optimal fashion , 2002, Nature.

[9]  Miomir Vukobratovic,et al.  Zmp: a Review of Some Basic Misunderstandings , 2006, Int. J. Humanoid Robotics.

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

[11]  Ferdinando Cannella,et al.  Design of HyQ – a hydraulically and electrically actuated quadruped robot , 2011 .

[12]  Robert L Gillette,et al.  Recent developments in canine locomotor analysis: a review. , 2008, Veterinary journal.

[13]  Xiao Rong Lv,et al.  Dynamic Simulation of Small Crawler Chassis Turning Based on RecurDyn , 2013 .

[14]  D. Marghitu,et al.  Effects of bandage configuration on paw pad pressure in dogs: a preliminary study. , 2003, Journal of the American Animal Hospital Association.

[15]  Manuel A. Armada,et al.  High-Resolution Indirect Feet–Ground Interaction Measurement for Hydraulic-Legged Robots , 2009, IEEE Transactions on Instrumentation and Measurement.

[16]  Xinghua Tian.  Mechanism Design and Comparison for Quadruped Robot with Parallel-serial Leg , 2013 .

[17]  Masato Suzuki,et al.  Proposal and Development of Arrayed Sole Sensor for Legged Robot and Contact Force Detection Using Neural Networks , 2011 .

[18]  W. Weijs,et al.  The vertical ground reaction force and the pressure distribution on the claws of dairy cows while walking on a flat substrate. , 2003, Journal of dairy science.

[19]  Ian R. Manchester,et al.  Bounding on rough terrain with the LittleDog robot , 2011, Int. J. Robotics Res..

[20]  Mohieddine Jelali,et al.  Hydraulic Servo-systems: Modelling, Identification and Control , 2012 .

[21]  J.C. Grieco,et al.  A six-legged climbing robot for high payloads , 1998, Proceedings of the 1998 IEEE International Conference on Control Applications (Cat. No.98CH36104).

[22]  R. McGhee,et al.  On the stability properties of quadruped creeping gaits , 1968 .

[23]  Karsten Berns,et al.  Clawar 99: A concept for walking behaviour in rough terrain , 1999 .

[24]  Friedrich Pfeiffer,et al.  Towards the design of a biped jogging robot , 2001, Proceedings 2001 ICRA. IEEE International Conference on Robotics and Automation (Cat. No.01CH37164).

[25]  T. J. Viersma,et al.  Analysis, Synthesis and Design of Hydraulic Servosystems and Pipelines , 1981 .

[26]  Bin Li,et al.  Research of mammal bionic quadruped robots: A review , 2011, 2011 IEEE 5th International Conference on Robotics, Automation and Mechatronics (RAM).