Invariant Error Dynamics Controller for a 6-dof Electrohydraulic Stewart Platform
The study of an invariant error dynamics controller for a six-degrees-of-freedom (dof) electrohydraulic Stewart platform is presented. Rigid body and electrohydraulic models, including servovalve dynamics are employed. Friction is also included in the mechanical model. The developed controller employs the dynamic and hydraulic model of the system and yields the six servovalve input current vector, in analytical form. Using mechanism inverse kinematics, the desired Cartesian trajectories yield desired actuator length trajectories. Simulations with typical desired trajectories are presented and a good performance of the controller is obtained.
KeywordsStewart Platform Develop Controller Invariant Error Platform Displacement Actuator Current
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- Davliakos, I., and Papadopoulos, E. (2005). Development of a Model-Based Nested Controller for Electrohydraulic Servos. In Proceedings 13 th Mediterranean Conference on Control and Automation, June 27–29, Limassol, Cyprus, 107–112.Google Scholar
- Honegger, M., and Corke, P. (2001). Model-Based Control of Hydraulic Actuated Manipulators. In Proceedings 2001 IEEE Int. Conf. on Robotics & Automation, Seoul, Korea, 2553–2559.Google Scholar
- Kim, N., I., and Lee, C., W. (1998). High Speed Tracking Control of Stewart Platform Manipulator via Enhanced Sliding Mode Control. IEEE Conf. On Robotics and Automation, Belgium, 2716–2721.Google Scholar
- Li, D., and Salcudean, S., E. (1997). Modeling, Simulation, and Control of a Hydraulic Stewart Platform. In Proceedings of the IEEE Int. Conf. on Robotics and Automation, 3360–3366.Google Scholar
- Merritt, H. E. (1967). Hydraulic Control Systems. J. Wiley.Google Scholar
- Shim, J., H., Park, J., Y., Kwon, D., S., and Kim, S. (1997). Kinematic Design of a Six Degree-of-Freedom In-Parallel Manipulator for Probing Task. In Proceedings of the IEEE Int. Conf. On Robotics and Automation, New Mexico, 2967–2973.Google Scholar
- Sirouspour, M. R., and Salcudean, S. E. (2000). A New Approach to the Control of a Hydraulic Stewart Platform. ISER 2000, 447–460.Google Scholar
- Stewart, D. (1965–66). A platform with six degrees of freedom. In Proceedings of the IMechE, Vol. 180, Pt. 1, No 15,371–385.Google Scholar
- Tsai, L., W. (1999). Robot Analysis, The Mechanics of Serial and Parallel Manipulators. J. Wiley & Sons.Google Scholar