Volume 20, Issue 6 (June 2020)
Modares Mechanical Engineering 2020, 20(6): 1625-1634 |
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Alem S, Sabooni E, Sheikholeslam F, Izadi I. Adaptive Robust Controller for Position Control of Piezoelectric Actuator with Unstructured Uncertainty. Modares Mechanical Engineering 2020; 20 (6) :1625-1634
URL: http://mme.modares.ac.ir/article-15-35035-en.html
URL: http://mme.modares.ac.ir/article-15-35035-en.html
1- Control Department, Electrical & Computer Engineering Faculty, Isfahan University of Thechnology, Isfahan, Iran
2- Control Department, Electrical & Computer Engineering Faculty, Isfahan University of Thechnology, Isfahan, Iran ,sheikh@cc.iut.ac.ir
2- Control Department, Electrical & Computer Engineering Faculty, Isfahan University of Thechnology, Isfahan, Iran ,
Abstract: (3604 Views)
Piezoelectric actuators are the most common choice for position control with ultra-high precision. Despite the significant advantages, the linear and nonlinear dynamics of these actuators, such as hysteresis, could decrease the precision of the control system. In this research, a controller based on the sliding mode method is proposed for position control of piezoelectric actuator. Sliding mode control is a model-based and useful method in nanopositioning systems. In this research, Bouc-Wen model is used for description of the actuator’s behavior. In this model, the linear dynamic is modeled with mass, stiffness and damping terms, and the hysteresis is modeled by its nonlinear dynamics. Usually, there are mismatch and uncertainty between the physical system and mathematical model. For stability analysis of the prevalent sliding mode control, the upper bound of uncertainty must be known. But, in practical systems, this is not possible, simply. On the other hand, selecting the large values for this bound, increases the controller gain and distances it from the optimum value. The proposed adaptive robust control eliminates the dependency to the upper bound of uncertainty. This is done by introducing an online adaptive law for estimating this bound. Proposing this law, asymptotic stability of the closed-loop control system is proven. Implementing the presented method on the laboratory setup and simulator software, its effectiveness is shown by simulation and experimental results.
Keywords: Piezoelectric Actuator, Adaptive Robust Control, Unstructured Uncertainty, Nanopositioning System, Sliding Mode Control
Article Type: Original Research |
Subject:
Mechatronics
Received: 2019/07/22 | Accepted: 2019/12/14 | Published: 2020/06/20
Received: 2019/07/22 | Accepted: 2019/12/14 | Published: 2020/06/20
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