Nonlinear decoupled control for multi-motors web winding system using the sliding-mode technique
ABSTRACT In this paper a nonlinear decoupled control is designed for multi-motors Web winding system. At the first, an ideal feedback linearization control system is adopted in order to decouple the tensions and velocity of the Web winding system. Then to enhance the performance of the control system in the present of uncertainties, such as electrical and mechanical parameter variation, external disturbance and unmodelled system dynamics, a sliding-mode feedback linearization control system is applied, that comprises a sliding-mode (SM) velocity controller and two SM tension controllers. Finally, the effectiveness and capability of the proposed control strategy is verified by computer simulation.
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ABSTRACT: The focus of this research is on modeling and design of a decentralized controller for web processing lines. First, an accurate dynamic model is developed for the unwind (rewind) roll in a web processing line by explicitly taking into account the time-varying nature of the roll inertia and radius. The unwind roll in a web processing line releases unfinished web to the process section; the rewind roll accumulates the finished web. Second, a strategy for computing the equilibrium inputs and reference velocities for each driven roll/roller is given; this strategy is based on dividing the web processing line into tension zones and using the reference web tension of each zone and the reference velocity of the master speed roller, which sets the desired web transport speed for the process line. Based on the new model developed, a decentralized controller is proposed. Variations in web tension and transport velocity in each tension zone are shown to exponentially converge to zero. A large experimental web platform, which mimics most of the features of an industrial process line, is used for experimentation. Extensive comparative experiments were conducted with the proposed decentralized controller and an often used decentralized industrial proportional-integral (PI) controller. A representative sample of the experimental results is shown and discussedIEEE Transactions on Control Systems Technology 02/2007; · 2.00 Impact Factor
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ABSTRACT: Presents a design for nonlinear decoupled control of a linear induction motor (LIM) servo-drive. An ideal feedback linearisation control (IFLC) system is first adopted in order to decouple the thrust force and the flux amplitude of the LIM. However, the control performance of the LIM is influenced seriously by the uncertainties of the plant, such as electrical and mechanical parameter variation, external force disturbance and unmodelled dynamics in practical applications. Hence, to increase the robustness of the LIM drive for high-performance applications, a sliding-mode feedback linearisation control (SMFLC) system, that comprises a sliding-mode flux controller and a sliding-mode position controller, is proposed to decouple the thrust force and the flux amplitude of the LIM. The control laws of the SMFLC system are derived in the sense of the Lyapunov stability theorem, such that the asymptotic stability of the control system can be guaranteed under the occurrence of system uncertainties. Moreover, to relax the requirement of the secondary flux in the SMFLC system, an adaptive flux observer is proposed to estimate the secondary flux, considering all possible uncertainty in practical applications. In addition, the effectiveness of the proposed control scheme is verified by some simulated resultsIEE Proceedings - Control Theory and Applications 06/2001; · 1.05 Impact Factor
Conference Proceeding: H~~-Feedback Decentralized Control by BMI Optimization for Large Scale Web Handling Systems[show abstract] [hide abstract]
ABSTRACT: In web transport systems, the main concern is to control independently speed and tension in spite of perturbations, such as radius variations and changes of set points. In this paper we present multivariable H<sub>infin</sub> controllers, applied to winding systems and determined by a bilinear matrix inequality (BMI) approach. The design relies on full state feedback, with or without addition of integrators. The use of partial integral action for error-free reference tracking and disturbance rejection is established theoretically and discussed in this paper. Simulation results are given based on a nonlinear model identified on a 3-motor winding test bench as well as on its 9-motor expansionAmerican Control Conference, 2006; 07/2006