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In this paper, on the basis of sliding mode control theory, a new integral tangent adaptive fuzzy sliding mode control for aircraft engine was proposed. Based on the uncertainty model of aircraft engine, a hyperbolic tangent integral sliding surface was constructed at first, and it effectively overcome the problem of integral saturation effect which was often occur in the traditional integral sliding...
In this paper, the problem of robust sliding mode control is studied for a class of discrete delayed nonlinear systems subject to randomly varying nonlinearities (RVNs) under uncertain occurrence probability. Here, the time-varying delay is bounded with known upper and lower bounds. The RVNs under uncertain occurrence probability are characterized by utilizing a Bernoulli distributed random variable,...
In this paper the reaching law approach to designing sliding mode controllers is used. In particular, the case of switching variable of relative degree r > 1 is considered. It is demonstrated, that the use of such a variable allows more freedom in designing the controller and can result in reducing the maximum absolute value of the control signal without compromising the robustness with respect...
In this paper, we investigate the chaos synchronization of uncertain optical chaotic systems. More precisely, we also present a systematic approach for designing a fractional-order sliding mode controller to achieve a rapid, robust and perfect chaos synchronization. By this robust controller, it is rigorously proven that the associated synchronization error is Mittag-Leffler stable. In a numerical...
A sliding mode control method for networked control systems with successive packet losses is studied in this paper. A new estimate strategy is proposed due to the intermittent information obtained at the controller side. Base the the estimation of the system, an integral sliding surface is proposed and a linear control law is constructed to guarantee the system converge to the ideal sliding surface...
This paper presents the cascaded PI-continuous second order sliding mode control for induction motor in the presence of operational constraints. The inner-loop Sliding Mode Control (SMC) is designed to control the current dynamics of the motor while the outer-loop control is the PI control of speed. The main advantages of the proposed method are that the PI control provides reference to inner-loop...
The flexible joint robot manipulators provide various benefits, but also present many control challenges such as nonlinearities, strong coupling, vibration, etc. This paper proposes optimal second order integral sliding mode control (OSOISMC) for a single link flexible joint manipulator to achieve robust and smooth performance. Firstly, the integral sliding mode control is designed, which consists...
To deal with the unsatisfactory transient response of the conventional integral sliding mode control (ISMC), A nonlinear integral sliding mode controller (NISMC) is proposed in this paper, which uses a smooth nonlinear function with “small error amplification and large error saturation” property, meanwhile, takes the limited input into account. The proposed NISMC improves the transient performance,...
The paper proposes the novel switched sliding mode control to enhance the performance of the control system with uncertainties and disturbances and adjust control behaviors to the status. With a small and moderate augmentation of the complexity, the performance of control systems is increased by the control method, which is with a new type of the reaching law — robust global high-speed finite-time...
In this paper, a robust integral sliding mode controller is designed for the position and attitude control of an autonomous quadrotor with under-actuated characteristics. The designed controller can stabilize the pitch angle and roll angle while the three position and yaw angle could converge to the desired values. Furthermore, the flight controllers are derived via the Lyapunov theory, which can...
This paper presents a new control methods based on a novel reaching law to overcome slow convergence rate and severe chattering in sliding mode control of permanent magnet synchronous motors (PMSM). The constant reaching law converges slowly during large systematic errors. Although the power reaching law converges fast during large error, it chatters severely while approaching to the sliding surface...
This paper presents a novel integral sliding mode control (ISMC) for singularly perturbed systems (SPSs) with matched disturbances. Firstly, a linear state feedback control law for the fast subsystem of SPS is designed, and the slow subsystem can be obtained. Secondly, an ISMC incorporating the disturbance estimate provided by a disturbance observer is designed. In order to attenuate matched disturbances,...
In this paper, we propose a predictor-based sliding mode control algorithm for LTI systems with input-delay and disturbance. It is shown that our proposed algorithm can completely reject the constant disturbance from the state channel. It is also shown that with our proposed algorithm, an enhanced disturbance rejection can be achieved for a large class of other time-varying disturbances. Simulations...
An adaptive dynamic special global sliding mode controller which is based on proportional integral derivative (PID) sliding surface using radial basis function (RBF) neural network (NN) for a three-phase active power filter (APF) was presented in this paper. To overcome problems associated with schemes of the conventional sliding mode control, a global PID sliding manifold is introduced to realize...
This paper deals with a robust formation control methodology for the Multi-UAV system with uncertain exogenous disturbance. The fourth-order UAV model with disturbance and the disturbance estimate system is introduced. In order to achieve the rigid formation fight, graph theory and consensus algorithm are utilized and the state of the UAVs converges to desired value by using Leader-Follower structure...
This paper presents the practical implementation of a new robust third order sliding mode controller for an electropneumatic actuator with a predefined convergence time. The controller robustness is discussed with respect to external disturbances. Implementation results on an electropneumatic actuator setup show the effectiveness of the controller.
To improve the performance of the bearingless induction motor (BIM) under disturbances, a nonsingular fast terminal sliding mode control (NFTSMC) strategy is proposed. The sliding mode surface is designed as a combination of linear sliding mode and nonsingular terminal sliding mode. Besides, considering the power function of the state variables, which make the approaching speed correlate with the...
To enhance the control precision of permanent magnet synchronous motor (PMSM) under parameter variations and load torque disturbances, a minimal reduced-order load torque observer (MRLTO) based discrete-time sliding mode control (DSMC) scheme is presented. First, a DSMC controller is presented on the basis of the second-order discrete-time PMSM dynamics model to enhance the speed tracking response...
In order to improve the speed-regulation performance of the permanent-magnet synchronous motor (PMSM) system under uncertainties and disturbances, an equivalent disturbance observer (EDO) based discrete-time integral sliding mode control (DISMC) scheme is proposed. To avoid the high-frequency noise caused by the differential terms of conventional sliding mode control (SMC), a discrete-time integral...
The study in this article focuses on chattering free higher order sliding mode control (HOSMC) and continuous time event triggered higher order sliding mode control (ET-HOSMC) for nonlinear uncertain systems. Conventional sliding mode control is affected by high-frequency oscillation in the control signal known as chattering. Chattering in the control signal overshadows the main advantages of sliding...
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