Joint Stiffness Identification and Flexibility Compensation of Articulated Industrial Robot

Abstract:

Articulated robots are the most common industrial robots for their large workspace and flexibility. However, the existence of joint flexibility makes those robots difficult to achieve high absolute position accuracy. This paper presents a method to identify the joint stiffness of the robot. The basic idea of that method is to get joint stiffness based on Hooks Law through stepping movement of a single joint and calculating the corresponding joint gravity torque of every step. The practicality of that method is verified by experiment and a plan is carried out to compensate the joint flexibility.

• Periodical: Applied Mechanics and Materials (Volumes 336-338)
• Pages: 1047-1052
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.336-338.1047
• Online since: July 2013
• Authors: Ya Lei Feng, Dao Kui Qu, Fang Xu, Hong Guang Wang
• Keywords: Flexibility Compensation, Identification, Industrial Robot, Joint Stiffness

References

[1] Whitney, D., C. Lozinski, and J. Rourke,"Industrial robot forward calibration method and results," Journal of Dynamic Systems, Measurement, and Control, vol. 108, pp.1-7,1986.

DOI: 10.1115/1.3143737

[2] Everett, L.,"Models for diagnosing robot error sources," Robotics and Automation, 1993. Proceedings., 1993 IEEE International Conference on 1993: IEEE, vol.2,pp.155-159, May 1993.

DOI: 10.1109/robot.1993.292140

[3] R Roth, Z., B. "Mooring, and B. Ravani, An overview of robot calibration," IEEE journal of robotics and automation, vol.3(5),pp.377-385,1987.

DOI: 10.1109/jra.1987.1087124

[4] Elatta, A., et al.,"An overview of robot calibration. Information Technology," Robotics and Automation, IEEE Journal of,vol.3(1),pp.74-78.

[5] Duelen, G. and K. Schroer,"Robot calibration--Method and results,"Robotics and Computer-Integrated Manufacturing, vol.8(4), pp.223-231,1991.

DOI: 10.1016/0736-5845(91)90034-p

[6] Gong, C., J. Yuan, and J. Ni, "Nongeometric error identification and compensation for robotic system by inverse calibration," International Journal of Machine Tools and Manufacture, vol. 40(14), pp.2119-2137,2000.

DOI: 10.1016/s0890-6955(00)00023-7

[7] Mooring, B., M. Driels, and Z. Roth,"Fundamentals of manipulator calibration,", John Wiley & Sons, Inc. New York, NY, USA,1991.

[8] Abele, E., M. Weigold, and S. Rothenbucher,"Modeling and identification of an industrial robot for machining applications," CIRP Annals-Manufacturing Technology, vol.56(1), pp.387-390,2007.

DOI: 10.1016/j.cirp.2007.05.090

[9] Salisbury, J. and J. Craig,"Articulated hands: kinematic and force control issues," International Journal of Robotics Research, vol. 2(1),pp.4-17,1992.

DOI: 10.1177/027836498200100102

[10] Dumas, C., et al.,"Joint Stiffness Identification of Industrial Serial Robots," Robotica, p.20,2011. 1.

[11] Khosla, P.K. and T. Kanade,"Parameter identification of robot dynamics," Decision and Control, 1985 24th IEEE Conference on, vol.24,pp.1754-1760, 1985.

DOI: 10.1109/cdc.1985.268838

[12] Pradeep Khosla,"Estimation of Robot Dynamics Parameters: Theory and Application," tech. report CMU-RI-TR-87-08, Robotics Institute, Carnegie Mellon University, March, 1987 .

[13] Gautier, M. and W. Khalil,"Identification of the minimum inertial parameters of robots," Robotics and Automation, 1989. Proceedings., 1989 IEEE International Conference on, vol.3,pp.1529-1534,1989.

DOI: 10.1109/robot.1989.100196