The reduction of stick-slip friction in hydraulic actuators

The stick-slip friction phenomenon is observed near zero relative velocity, during the transition from static to dynamic friction, when static friction is greater than dynamic friction. This nonlinear change in friction force over a small change in velocity results in difficulties in achieving accurate and repeatable position control. In some cases, the actuator position controller reaches a limit cycle (hunting effect). Friction compensation at low speeds has traditionally been approached through various control techniques. This paper proposes an alternative solution, namely, friction avoidance. By rotating the piston and rod, the Stribeck region of the friction-velocity curve is avoided and the axial friction opposing the piston movement is approximately linearized. Simulation and experimental results are presented to validate this approach.

[1]  Clarence W. de Silva,et al.  Tracking control of an electrohydraulic manipulator in the presence of friction , 1998, IEEE Trans. Control. Syst. Technol..

[2]  Bernard Friedland,et al.  On the Modeling and Simulation of Friction , 1990, 1990 American Control Conference.

[3]  Ken Dutton,et al.  The art of control engineering , 1988 .

[4]  Nariman Sepehri,et al.  Experimental evaluation of generalized predictive control applied to a hydraulic actuator , 1998, Robotica.

[5]  P. M. FitzSimons,et al.  Part i: Modeling of a one-degree-of-freedom active hydraulic mount; part ii: Control , 1996 .

[6]  Peter I. Corke,et al.  A pressure-based, velocity independent, friction model for asymmetric hydraulic cylinders , 1999, Proceedings 1999 IEEE International Conference on Robotics and Automation (Cat. No.99CH36288C).

[7]  P. Sollero,et al.  Numerical methods for engineers, 2nd edition: S.C. Chapra & R.P. Canale, McGraw-Hill. pp. 812, hardback. ISBN: 0 07 079984 9 , 1992 .

[8]  Carlos Canudas de Wit,et al.  Adaptive friction compensation with partially known dynamic friction model , 1997 .

[9]  Carlos Canudas de Wit,et al.  A new model for control of systems with friction , 1995, IEEE Trans. Autom. Control..

[10]  A. Yagle,et al.  Modeling and Identification of Lubricated Polymer Friction Dynamics , 2000 .

[11]  Steven C. Chapra,et al.  Numerical Methods for Engineers , 1986 .

[12]  Carlos Canudas de Wit,et al.  Adaptive Friction Compensation in Robot Manipulators: Low Velocities , 1989, Proceedings, 1989 International Conference on Robotics and Automation.

[13]  Byung-Jae Kwak,et al.  Nonlinear system identification of hydraulic actuator friction dynamics using a finite-state memory model , 1999, 1999 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings. ICASSP99 (Cat. No.99CH36258).

[14]  Dean Karnopp,et al.  Computer simulation of stick-slip friction in mechanical dynamic systems , 1985 .

[15]  C.W. de Silva,et al.  Position and force control of an electrohydraulic manipulator in the presence of friction , 1995, 1995 IEEE International Conference on Systems, Man and Cybernetics. Intelligent Systems for the 21st Century.

[16]  M. Singaperumal,et al.  Experimental study of friction in hydraulic actuators with sealless pistons , 1994 .

[17]  Bruno Siciliano,et al.  Modeling and Control of Robot Manipulators , 1995 .

[18]  John Watton.  Fluid Power Systems: Modeling, Simulation, Analog and Microcomputer Control , 1989 .

[19]  Nariman Sepehri,et al.  Development of a nonlinear PI controller for accurate positioning of an industrial hydraulic manipulator , 1997 .

[20]  Carlos Canudas de Wit,et al.  A survey of models, analysis tools and compensation methods for the control of machines with friction , 1994, Autom..

[21]  Elizabeth A. Croft,et al.  Reducing stick-slip friction in hydraulic actuators , 2001, 2001 IEEE/ASME International Conference on Advanced Intelligent Mechatronics. Proceedings (Cat. No.01TH8556).

[22]  A.J.J. van der Weiden,et al.  Modeling and control of an industrial hydraulic rotary vane actuator , 1993, Proceedings of 32nd IEEE Conference on Decision and Control.

[23]  K. N. Seetharamu,et al.  Theoretical analysis of tapered pistons in high speed hydraulic actuators , 1990 .

[24]  Brian Birge,et al.  PSOt - a particle swarm optimization toolbox for use with Matlab , 2003, Proceedings of the 2003 IEEE Swarm Intelligence Symposium. SIS'03 (Cat. No.03EX706).

[25]  Carlos Canudas de Wit,et al.  Adaptive friction compensation in DC motor drives , 1986, Proceedings. 1986 IEEE International Conference on Robotics and Automation.

[26]  C. C. Davis,et al.  Development, Simulation, and Validation of a Highly Nonlinear Hydraulic Servosystem Model , 1989, 1989 American Control Conference.

[27]  Shahram Tafazoli Bilandi.  Identification of frictional effects and structural dynamics for improved control of hydraulic manipulators , 1997 .

[28]  Jon Rigelsford,et al.  Manufacturing Automation: Metal Cutting Mechanics, Machine Tool Vibrations, and CNC Design , 2004 .

[29]  Andrew E. Yagle,et al.  Nonlinear system identification of hydraulic actuator. Friction dynamics using a Hammerstein model , 1998, Proceedings of the 1998 IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP '98 (Cat. No.98CH36181).

[30]  C.W. de Silva,et al.  Friction estimation in a planar electrohydraulic manipulator , 1995, Proceedings of 1995 American Control Conference - ACC'95.

[31]  Bernard Friedland,et al.  On adaptive friction compensation , 1991, [1991] Proceedings of the 30th IEEE Conference on Decision and Control.

[32]  Dirk Alan Wassink.  Friction dynamics in low speed, lubricated sliding of rubber: A case study of lip seals. , 1996 .

[33]  Carlos Canudas-de-Wit,et al.  Friction compensation for an industrial hydraulic robot , 1999 .

[34]  Brian Armstrong-Hélouvry,et al.  Control of machines with friction , 1991, The Kluwer international series in engineering and computer science.