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In this paper, the problem of system identification for the lateral motion of a strip in hot finishing mill is investigated. The movement is affected by various asymmetric factors with respect to rolling force. Not only that, the tension between rolling mills determines the direction of strip's moving. Consequently, the movement of a strip is complex dynamics with rolling condition, tension and other...
The purpose of this paper is to control linear systems with mismatched disturbances using proportional multiple-integral observer(PMI-observer) and sliding mode control(SMC). Based on the system output, PMI-observer estimates unknown states and disturbance. SMC reduces the mismatched disturbances and make the system stable. Stability is proved by Lyapunov theorem and simulation results show the effectiveness...
This paper proposes a periodic adaptive state dependent disturbance observer (PASDDOB) for motor control with the unknown input time delay, known output time delay and unknown phase delay from Q-filter to compensate the state dependent disturbance (SDD) that changes slowly by time. The PASDDOB has a structure that combines the state dependent disturbance observer (SDDOB) with the periodic adaptive...
This paper is concerned with the problem of decentralized H∞ proportional-plus-derivative(PD) state feed-back control of uncertain large-scale descriptor systems. The uncertainties are assumed to be polytopic type and appearing in derivative matrices as well as state and input matrices. Sufficient condition for stabilization of uncertain large-scale descriptor systems via H∞ PD state feedback is addressed...
In this paper, PIλDμ-type fractional-order proportional-integral-derivative (FOPID) used electromagnetic strip vibration control is proposed for a continuous galvanizing line (CGL). Since a FOPID controller has two more extra tuning knobs than conventional PID controller, FOPID gives more flexibility for the design of a control system, and has better opportunity to adjust system dynamics. FOPID control...
In this paper, decentralized guaranteed cost control for uncertain large-scale singular systems are studied. The parametric uncertainty which is assumed be norm-bounded exists not only in system matrices, but also in a derivative matrix. For the stabilization of the given system, guaranteed cost proportionalplus-derivative state feedback is suggested. The linear matrix inequality (LMI) condition which...
This paper proposes an adaptive sliding mode control scheme for stabilization of two different stochastic chaotic systems with multi-constraints such as model uncertainties, disturbances, input nonlinearities and stochastic unknown parameters which are generated by the Wiener process. Using an adaptive control and a fuzzy logic systems, model uncertainties, disturbances and stochastic unknown parameters...
In this paper, the H2 filtering of bilinear systems is considered using T-S fuzzy approach. For the bounded input, the bilinear system can be transformed to the Takagi-Sugeno (T-S) fuzzy dynamic system by putting the control input as the premise variable. Then the robust H2 filter for T-S fuzzy system is designed upon existing results using the linear matrix inequality(LMI). The feasibility and effectiveness...
In this paper, we developed a complex projective synchronization for complex chaotic systems. We generalized a complex scaling matrix for synchronizing two chaotic systems with different orders. We proposed an adaptive control method to synchronize between drive and response chaotic complex systems with fully unknown parameters. Based on Lyapunov theorem, we proved the stability of the synchronization...
In this paper, stability of linear systems with state delay and input backlash is investigated. The uniformly ultimately boundedness stability condition of the given system is constructed in terms of linear matrix inequalities (LMI) form which can be easily solved with off the shelf tool. Sufficient condition for the stability is provided. Numerical examples are stated in accordance with the results.
In a research field of motor control, several types of control methods that target to eliminate the effects of state dependent disturbances in the motor control environment had been suggested. However, the unknown time-varying input time delay has not been considered in that control schemes. In this paper, a state dependent disturbance compensation method using adaptive control scheme in unknown time-varying...
This paper proposes a compensated robust Kalman filter to reduce estimation error of a practical system. The practical system is assumed to have system uncertainty and affected by external disturbance and noise. Proposed Kalman filter has a compensation input, which reduces discrepancy between error dynamics of the reference system model and that of the practical system. The compensation term is calculated...
In this paper, a PID based sliding mode controller is implemented on a micro quadrotor. The micro quadrotor is a nonlinear, underactuated and interconnected system, thus it should be regulated by an appropriate control technique. The advantages of the proposed controller are to remain the robustness characteristics to disturbances and to solve the chattering phenomenon of the conventional sliding...
This paper proposes an adaptive fuzzy nonsingular terminal sliding mode control (AFNTSMC) scheme for modified function projective synchronization (MFPS) of two different chaotic systems with unknown functions. The proposed scheme combines adaptive fuzzy logic control (AFLC) with fuzzy nonsingular terminal sliding mode control (FNTSMC). The AFLC can estimate the unknown functions. The FNTSMC can reduce...
This paper presents a tracking control scheme for positioning of piezo-actuated stage under hysteresis effect. The hysteresis is estimated by an nonlinear observer and is compensated via feedforward control. Sliding mode controller is employed as a feedback control to track the reference. Experimental results showed effectiveness of the proposed scheme.
The straightness of heading direction of a strip affects productivity and quality of a product in the steel making process, especially in the Hot Strip Rolling. So far, various approaches have been proposed to solve the abnormal movement of the strip, called Lateral Motion. Numerous asymmetric factors between a pinch roll and a rolling material have caused to lateral motion of the strip. This study...
In this paper, a fuzzy-PI smith controller is derived for Automatic Gauge Control in a single-stand cold rolling mill. The controller consists of smith predictive control, fuzzy control, and PI control. The smith predictive control method is proposed to eliminate the time delay generated by the thickness measurement. Furthermore, the fuzzy control scheme is used to tune the parameters of PI controller...
In this paper adaptive backstepping terminal sliding mode synchronization for a class of uncertain chaotic system is proposed. For finite-time convergence, terminal sliding mode scheme is adopted to backstepping design procedure. It is assumed that only output is measured. Error dynamics is calculated from the difference of output in drive-response system. Finite-time convergent observer is used to...
This study presents a second-order sliding mode controller (2-SMC) for PI-controlled refrigeration system whose relative degree is one. 2-SMC is an effective tool for control of uncertain nonlinear system since it overcomes chattering phenomenon of the classical first-order sliding mode controller (1-SMC) and guarantees higher accuracy in presence of system imperfections. Super-twisting algorithm...
In sliding mode control, state trajectory is divided to reaching mode and sliding mode. A method of robust model predictive control is employed to improve performance in reaching mode. Uncertain discrete time systems can be transformed to polytopic uncertain system. Then, the employed robust model predictive control can handle the robustness in uncertain polytopic system. The strong point of the proposed...
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