Joint stiffness identification of a heavy Kuka robot with a low-cost clamped end-effector procedure

This paper proposes two new methods for the identification of static stiffnesses of multi degrees of freedom heavy industrial robots. They are based on a locked link joint procedure obtained with an end-effector fixed to the environment. The first method requires only measurements of motor positions and motor torques data computed from motor current measurements and manufacturer's drive gains. The second one needs a torque sensor to measure the interaction wrench between the clamped end-effector and the environment. These methods are being experimentally validated and compared on the 2 first joints of a 6 degrees of freedom heavy 500Kg payload industrial Kuka KR500 robot.

[1]  Maxime Gautier.  Dynamic identification of robots with power model , 1997, Proceedings of International Conference on Robotics and Automation.

[2]  Josef Hölzl,et al.  Parameter identification for industrial robots , 1995, Proceedings of 1995 IEEE International Conference on Robotics and Automation.

[3]  Maxime Gautier,et al.  A Generic Instrumental Variable Approach for Industrial Robot Identification , 2014, IEEE Transactions on Control Systems Technology.

[4]  Maxime Gautier,et al.  Dynamic Identification of flexible joint manipulators with an efficient closed loop output error method based on motor torque output data , 2013, 2013 IEEE International Conference on Robotics and Automation.

[5]  Stéphane Caro,et al.  Joint stiffness identification of six-revolute industrial serial robots , 2011 .

[6]  Maxime Gautier,et al.  Identification of joint stiffness with bandpass filtering , 2001, Proceedings 2001 ICRA. IEEE International Conference on Robotics and Automation (Cat. No.01CH37164).

[7]  Wisama Khalil,et al.  Model Identification , 2019, Springer Handbook of Robotics, 2nd Ed..

[8]  Wisama Khalil,et al.  Direct calculation of minimum set of inertial parameters of serial robots , 1990, IEEE Trans. Robotics Autom..

[9]  Wisama Khalil,et al.  A new geometric notation for open and closed-loop robots , 1986, Proceedings. 1986 IEEE International Conference on Robotics and Automation.

[10]  Mikael Norrlöf,et al.  Closed-Loop Identification of an Industrial Robot Containing Flexibilities , 2003 .

[11]  Wisama Khalil,et al.  Modeling, Identification and Control of Robots , 2003 .

[12]  Maxime Gautier,et al.  Global identification of spring balancer, dynamic parameters and drive gains of heavy industrial robots , 2013, 2013 IEEE/RSJ International Conference on Intelligent Robots and Systems.

[13]  Bijan Shirinzadeh,et al.  Enhanced stiffness modeling, identification and characterization for robot manipulators , 2005, IEEE Transactions on Robotics.

[14]  Maxime Gautier,et al.  Experimental joint stiffness identification depending on measurements availability , 2011, IEEE Conference on Decision and Control and European Control Conference.