Controller design and implementation for industrial robots with flexible joints

A control strategy which consists of feedforward and feedback compensation loops is proposed to improve the performance of industrial robots. The feedforward loop is similar to the usual inverse-dynamics compensation. The feedback control loop uses a frequency-domain optimal controller. The design starts from the single-link case and is extended to the control of multilinkage flexible-joint robots. An experimental system consisting of a single-link robot is constructed for verifying the proposed control strategies. Experiments show good performance of the proposed control strategy in stiffening the flexible joint and in tracking desired polynomial-type trajectories. >

[1]  P. Khargonekar,et al.  State-space solutions to standard H2 and H∞ control problems , 1988, 1988 American Control Conference.

[2]  Michael G. Safonov,et al.  CACSD using the state-space L/sup infinity / theory-a design example , 1988 .

[3]  M. Spong,et al.  Adaptive control of flexible joint manipulators , 1989, Proceedings, 1989 International Conference on Robotics and Automation.

[4]  P. Khargonekar,et al.  State-space solutions to standard H/sub 2/ and H/sub infinity / control problems , 1989 .

[5]  R. Paul.  Robot manipulators : mathematics, programming, and control : the computer control of robot manipulators , 1981 .

[6]  J. Y. S. Luh,et al.  Conventional controller design for industrial robots — A tutorial , 1983, IEEE Transactions on Systems, Man, and Cybernetics.

[7]  Khashayar Khorasani.  Robust adaptive stabilization of flexible joint manipulators , 1989, Proceedings, 1989 International Conference on Robotics and Automation.

[8]  Mark W. Spong,et al.  Adaptive control of flexible-joint manipulators , 1989, IEEE Control Systems Magazine.

[9]  L. M. Sweet,et al.  Structures for Sensor-Based Robot Motion Control , 1984, 1984 American Control Conference.

[10]  Malcolm Good,et al.  Dynamic Models for Control System Design of Integrated Robot and Drive Systems , 1985 .

[11]  Andreas Jacubasch,et al.  Control algorithms for stiffening an elastic industrial robot , 1985, IEEE J. Robotics Autom..

[12]  Petar V. Kokotovic,et al.  An integral manifold approach to the feedback control of flexible joint robots , 1987, IEEE J. Robotics Autom..

[13]  Scott M. Babcock,et al.  Inverse dynamics position control of a compliant manipulator , 1986, Proceedings. 1986 IEEE International Conference on Robotics and Automation.

[14]  M. Spong.  Modeling and Control of Elastic Joint Robots , 1987 .

[15]  Shaheen Ahmad,et al.  Control of industrial robots with flexible joints , 1987, Proceedings. 1987 IEEE International Conference on Robotics and Automation.

[16]  Li-Chen Fu,et al.  Nonlinear adaptive motion control for a manipulator with flexible joints , 1989, Proceedings, 1989 International Conference on Robotics and Automation.