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Though sliding mode variable structure controller has good robustness and high stability, its chattering phenomenon is widely exist. A fuzzy sliding mode controller is designed based on exponential approach law by combining sliding control and fuzzy control in this paper. The computer simulation is applied to verify the advance of the fuzzy sliding mode controller and the controller is applied to...
This paper presents a novel approach for speed governing of hydro-turbine by means of a sliding mode controller. For selecting a group of parameters of the sliding surface, genetic algorithm is employed to search these parameters. For decreasing the chattering problem of the sliding mode controller, a fuzzy interface system is harnessed to regulate the controller gain. To verify the feasibility and...
This paper presents the method of discrete-time sliding mode control (DT-SMC) for a class of nonlinear time-delay systems via Takagi-Sugeno (T-S) fuzzy model. First, the discrete-time linear model with uncertainties and tine-varying delay is derived by employing T-S model to represent original system. Then the control problem becomes the robust stabilization controller design for linear uncertain...
A global sliding mode variable structure controller based on fuzzy logic is adopted to Permanent magnet Synchronous Motor. First,. the controller can ensure sliding behavior throughout an entire response, we can specify the demands on the capability of the system to achieve a desired performance. Moreover, the control law is based on equivalent control, in which the function sign(·)is substituted...
At the moving crossbeam levitation system of the gantry NC machine tool, in order to achieve levitation gaps precision control and considering the effect of disturbance on magnetic levitation system when the tool is cutting, we design a dynamic integral siding mode controller controlling the levitation gaps. This method can effectively decrease chatting of siding mode controller and keep the stability...
A robust sliding mode observer is presented in this paper. The design of the observer's parameters needs not to solve a lot of equations. The observer proposed in the paper is robust to the nonlinearities and/or uncertainties of systems. The convergence rate between the observer and the system can be changed by choosing suitable sliding mode manifold, so that to attain the desired performances. Simulation...
In this paper, a robust adaptive fuzzy sliding mode controller is proposed to deal with the tracking control problem for a class of single-input single-output (SISO) perturbed strict-feedback nonlinear systems. It is known that the presence of perturbations is a very common problem in various kinds of engineering systems, and these perturbations involve unmodelled dynamics, external disturbances,...
A global robust sliding mode controller (GRSMC) is proposed for a class of uncertain systems with both state-delay and input-delay. Firstly, a linear transformation is introduced to transform the original system into one that only contains state-delay. Then an integral sliding mode surface, which can guarantee the system global robustness, is constructed in the new system of coordinates. Based on...
The problem of designing optimal sliding mode output tracking controllers for uncertain linear systems with the reference signals given by exosystem outputs is considered in this paper. Firstly, an augmented system, composed of the original system and the exosystem, is constructed to transform the optimal output tracking issue into the design problem of linear quadratic regulators (LQRs). And then...
A fuzzy sliding-mode robust controller with feed forward compensation is designed for grid-connected photovoltaic system. First, a integral sliding-mode controller is designed by exponential approach law to accelerate the system's starting phase, and for improving the stability of the system, the output of the sliding-mode controller is soften by fuzzy controller to reduce the flicking of the sliding-mode...
A tension adaptive variable-structure control system was designed for constant tension of electric cable plastic wrapping automatic production process. This system contains two inner loops for current and velocity control using PI regulators; its outer loop is for tension control using model reference adaptive controller. Simulation results indicate that the adaptive variable-structure controller...
Since PID control does not meet the high accuracy requirement for gyro stabilized sighting system of airborne optoelectronic pod operated in the circumstance of strong interference, this paper introduces the application of sliding mode variable structure controller for the position loop of the stabilized system. After the sliding mode variable structure controller with exponential approach law is...
This paper presents a general form for the fast terminal sliding mode (FTSM). It is shown that the proposed form not only includes the conventional FTSM, but also provides new types of FTSM which can have a faster convergence rate than the conventional one. More importantly, the convergence time of the new FTSM models is bounded for any initial value, which means an upper bound of the convergence...
A robust incipient faults diagnosis proposal for a class of nonlinear system with unknown input disturbances is presented in this paper. First, the uncertain nonlinear system is transformed into two subsystems and one of them is free from disturbances. Then for the subsystem free from disturbances, an adaptive observer is constructed to reconstruct incipient faults and a sliding mode observer is constructed...
Adaptive stepping sliding mode control strategy for the overload control of anti-ship missiles using Lyapunov's stability theory is proposed. In the first few steps, we assume there exists a virtual actuator, the virtual actuator concept can make the desired value can be easily traced, in the last step, a sliding mode controller is applied to guarantee the robustness of the system. At the same time,...
To improve the tracking precision, integrated control strategy of Permanent Magnet Linear Synchronous Motor (PMLSM) based on sliding mode control and repetitive control was proposed in this paper. Because PMLSM is easily affected by the periodic thrust fluctuation caused by the end effect, the periodic friction and other aperiodic disturbance during operating. The speed controller and the current...
This paper deals with the stabilization problem of uncertain nonlinear systems by passivity-based adaptive integral sliding mode control. The systems may possess both parametric uncertainties and unknown nonlinear functions that may represent modeling errors and external disturbances. The proposed method first combines immersion and invariance adaptive control with integral sliding mode control, which...
The problem of designing global sliding mode controllers for a class of linear and uncertain systems with time delays of control was concerned. Firstly, we proposed a new method for integral sliding surface. It can make up for the deficiencies of the traditional sliding surface, eliminating the process of reaching and ensuring the global robustness of the system. Secondly, this paper gave the process...
A new reaching law of sliding mode control is proposed. It is an efficient technique to reduce the chattering and to guarantee a good robustness of systems by using time-variable boundary layer. The design approach is much simpler than other approaches of time-variable boundary layer reaching law. The simulation results show that the novel control strategy is effective and feasible.
In this paper, we investigate the design problem of the sliding mode control for uncertain singular time-delay systems. Based on the dependent-delay robust stability criterion, we give an integral-type surface and propose a delay-dependent sufficient condition such that the sliding mode dynamics restricted to the surface is regular, impulse free, robustly asymptotically stable for all admissible uncertainties...
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