New Gravity Balancing Technique and Hybrid Actuation for Spatial Serial Manipulators

The problem of gravity balancing of robotic systems has been investigated for a long time. A big amount of different designs has been developed so far, but with several limitations: applicability only to planar kinematics or some particular spatial ones, encumbrance and reduced workspace of the robot, complication of both theoretical and practical implementation. This chapter deepens a new simple technique for gravity balancing any spatial serial manipulator with rotational joints, using a number of springs less or equal to the number of degrees of freedom of the manipulator. Then, such technique is extended to a concept of actuation for robotic systems. Given a robotic manipulator and a force to exert at the level of the end effector, there is no energy consumption regardless of the configuration of the system (like in passive systems), as long as magnitude and orientation of the required force are fixed. Changes in magnitude and/or orientation of the exerted force require some energy to be achieved (like in active systems). Such combined features make an hybrid system with several benefits: low energy consumptions, simplified control and intrinsic safety of the system, with wide prospects in robotics.

[1]  Dar-Zen Chen,et al.  Design of a Gravity-Balanced General Spatial Serial-Type , 2010 .

[2]  Ferdinand Freudenstein,et al.  Kinematic Synthesis of Linkages , 1965 .

[3]  G. K. Ananthasuresh,et al.  Perfect Static Balance of Linkages by Addition of Springs But Not Auxiliary Bodies , 2012 .

[4]  Sunil K. Agrawal,et al.  Gravity-balancing of spatial robotic manipulators , 2004 .

[5]  James T. Allison Plant-Limited Co-Design of an Energy-Efficient Counterbalanced Robotic , 2012, DAC 2012.

[6]  Thomas Sugar,et al.  Compliant constant-force mechanism with a variable output for micro/macro applications , 2003, 2003 IEEE International Conference on Robotics and Automation (Cat. No.03CH37422).

[7]  Thomas H. Massie,et al.  The PHANToM Haptic Interface: A Device for Probing Virtual Objects , 1994 .

[8]  Just L. Herder,et al.  Spring-to-Spring Balancing as Energy-Free Adjustment Method in Gravity Equilibrators , 2011 .

[9]  Vigen Arakelian,et al.  Improvement of balancing accuracy of robotic systems: Application to leg orthosis for rehabilitation devices , 2008 .

[10]  Tariq Rahman,et al.  A simple technique to passively gravity-balance articulated mechanisms , 1995 .

[11]  Martijn Wisse,et al.  A novel spring mechanism to reduce energy consumption of robotic arms , 2012, 2012 IEEE/RSJ International Conference on Intelligent Robots and Systems.

[12]  Vijay Kumar,et al.  Passive mechanical gravity compensation for robot manipulators , 1991, Proceedings. 1991 IEEE International Conference on Robotics and Automation.

[13]  Kenan Koser,et al.  A cam mechanism for gravity-balancing , 2009 .

[14]  M. B. Widden,et al.  The spring-and-lever balancing mechanism, George Carwardine and the Anglepoise lamp , 2000 .

[15]  G. Oriolo,et al.  Robotics: Modelling, Planning and Control , 2008 .

[16]  S. Stramigioli,et al.  A concept for a new Energy Efficient actuator , 2008, 2008 IEEE/ASME International Conference on Advanced Intelligent Mechatronics.

[17]  Dar-Zen Chen,et al.  A theoretical study of weight-balanced mechanisms for design of spring assistive mobile arm support (MAS) , 2013 .

[18]  Shiqian Wang,et al.  Spring uses in exoskeleton actuation design , 2011, 2011 IEEE International Conference on Rehabilitation Robotics.

[19]  Vincent Hayward,et al.  FREEDOM-7: A High Fidelity Seven Axis Haptic Device with Application to Surgical Training , 1997, ISER.

[20]  Sébastien Krut,et al.  Design of a 3D gravity balanced orthosis for upper limb , 2008, 2008 IEEE International Conference on Robotics and Automation.

[21]  Sunil K. Agrawal,et al.  Design and fabrication of an active gravity balanced planar mechanism using auxiliary parallelograms , 2001 .

[22]  Antonio Frisoli,et al.  An Innovative Actuation Concept for a New Hybrid Robotic System , 2013 .