IMPROVING PERFORMANCE IN SINGLE-LINK FLEXIBLE MANIPULATOR USING HYBRID LEARNING CONTROL
Keywords:
Iterative learning control, PD control, PID control, Input shaping, Flexible manipulator, Vibration control.Abstract
An iterative learning control method for a single-link flexi ble manipulator is proposed to achieve precise tracking control and end-point vibration suppression ofthe system. The learning is done in a feedback configuration Wilh hybrid control and the learning law updates the feedforward input from the error of the previous trial. The dynamic model of the flexible manipulator is derived using the finite element method. Initially, a collocated proporlional-derivative (PD) controller utilizing hub-angle and hub-velocity feedback is developed for control of rigid-body motion of the system. The controller is then extended to incorporate a non-collocated proportional-integral-derivative (PlD) controller and a feedforward controller based on input shaping techniques for control of vibration (flexible motion) of the system. Simulation results of the response of the manipulator with the controllers are presented in the time and frequency domains. The performance of the hybrid iterative learning control scheme is assessed in terms of input tracking and level of vibration reduction in comparison to a conventionally designed collocated PD and non-collocated PID control schemes.
References
Arimoto, S., Kawamura, S. and Miyazaki, F., 1984, "Bettering Operation of Robot, by Learning. Journal of Robotic Systems. 1(2), 123-140.
Craig, J. J., 1988, "Adaptive Control of Mechanical Manipulators" , AddisonWesley Publishing Company.
Horowitz, R., 1993, "Learning Control of Robot Manipulators", Journal of Dynamic Systems. Measurement and Control. 115,402-411 .
Panzieri, S. and Ulivi, G., 1995, "Disturbance Rejection of Iterati ve Learning Control Applied to Trajectory Tracking for A Flexible Manipulator", Proceedings ofr'European Control Conference (ECC). 2374-2379.
Amann, N., Owens, D. H. and Rogers, E., 1995, "Iterative Learning Control for Discrete Time Systems with Exponential Rate of Convergence!' , Technical Report 95/ 14, Centre for Systems and Control Engineering, University of Exeter.
Gunnarsson, S. and Norrlof M., 1997, "A Short Introduction to Iterative Learning Controf', 1997, Technical Report LiTH-ISY-R- I926, Department of Electrical Engineering.
Azad, A. K. M., 1994, "Analysis and Design of Control Mechanism fo r Flexible Manipulator Systems", PhD Thesis, Department of Automatic Control and Systems Engineering, The University of Sheffield.
Chen, 1. S., and C.-H. Menq, C. H., 1990, "Experiments on the Payload Adaptation of A Flexible One-Link Manipulator with Unknown Payload", Proceedings of the IEEE Conf erence on Decision and Control, Honolu lu, Hawaii,1614- 1619.
M. O. Tokhi, M. 0., Mohamed, Z. and Shaheed, M. H., 2001, "Dynamic Characterization of A Flexible Manipulator System", Robotica. 19(5), 571 580.
W. B. Gevarter. Basic relations for control of flexible vehicles, American Institute of Aeronaunting Astronaunting Journal, 1970, 8(4), 666-672.
II . Warwick, K., 1989, "Control systems: An Introduction" , Prentice Hall,
London.
Arimoto, S., Kawamura, S., Miyazaki, F., 1985, "Applications of Learning Method For Dynamic Control of Robot Manipulators", Proceedings of 24th Conference On Decision and Control, Ft. Lauderdale. 1381-6.
Arimoto, S., Kawamura, S., Miyazaki, F., 1986, "Convergence, Stability and Robustness of Learning Control Schemes for Robot Manipulators", Recent Trends in Robotics: Modelling, Control and Education. ed. By M. Jamshidi, L.Y.S. Lub, and M. Shahinpoor, 307-3 16.
Arimoto, S., Kawamura, S., Miyazaki, F., 1985, "Hybrid Position/Force Control of Robot Manipulators Based on Learning Method", Proceedings of International Conference on Advanced Robotics. 235-242.
Mailah, M., 1998, "Intelligent Active Force Control of A Rigid Robot Ann Using Neural Network and Iterative Learning Algorithm", PhD Thesis, University of Dundee, Dundee.
Mohamed, Z., and Tokhi, M. 0., 2002, "Vibration Control of A Single-Link Flexible Manipulator Using Command Shaping Techniques", Proceedings of IMech-l: Journal of Systems and Control Engineering. 216(12), 191-210.
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