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A novel adaptive controller based on sliding mode control with Fourier series approximation approach is presented. To eliminate the impact of time variant characteristics of dead zone, a control law is proposed with an undetermined uncertainty item and an undetermined compensation item through sliding control method, which are then approximated with Fourier series. Lyapunov method is used to guarantee...
In this paper, the adaptive fuzzy sliding mode control is applied to electrode regulator systems of arc furnace, and the detailed design procedure of the fuzzy sliding mode control system is presented. The adaptive fuzzy control is utilized to approach the equivalent control of sliding mode control, then the adaptive law is derived. The discontinuous control, which guarantees the stability of control...
The problems of stochastic stability and sliding mode Hinfin control for a class of nonlinear matched and mismatched uncertain systems with stochastic jumps are considered in this paper. The uncertain system under consideration may have mismatched norm bounded uncertainties in the state matrix. The transition of the jumping parameters in the systems is governed by a finite-state Markov process. A...
This paper presents active disturbance rejection control system for toggle-motor coupling servomechanism system. Genetic algorithm and mixed H2/Hinfin norm index are utilized to optimize the system parameters; Monte-Carlo method is applied to evaluate the robustness of the control system. Simulation results show that under the condition of external disturbance, parameters perturbation and coupling,...
Proposed method in the present paper could deal with fault tolerant control system by using the so called decentralized control theory with decoupling fashion sliding mode control, dealing with subsystems instead of whole system, and also in this paper we present a new design scenario to implement this method and design the controller.
Giant magnetostrictive material (GMM) is gathering more interests due to its superior electromechanical properties. Though the strain of GMM is almost larger than PZT, it still needs to be amplified to match practical demands. A press-bend amplification based giant magnetostrictive actuator (GMA) is designed and the electromechanical system model is presented. The dynamic model consists of two subsystems,...
Variable eigenvalues control (VEC) changes systempsilas eigenvalues based on fixed poles assignment to realize more flexible and effective control compared with traditional control methods. This work introduced the VEC of first and second order systems. Stability and convergence of these systems were studied and discussed through theoretical analyses and simulations of Matlab/Simulink.
A controller is designed to drive buck DC power converter systems based on smooth sliding mode control and backstepping design method. The controller can limitly track the reference output voltage trajectory and make the tracking error arbitrarily small, at the same time considering the parameter uncertainty of load resistance and the attenuation of electrical source. It belongs to practice tracking...
In this paper, both indirect and direct adaptive fuzzy controllers with variable structure system (VSS) and Hinfin performance are proposed for a class of nonlinear time-delay systems with unknown dynamics nonlinearities and external disturbances. It is assumed that the unknown nonlinear function of state-delays is bounded by a high-order function with unknown gains. An adaptive fuzzy controller design...
Air gap control of electrical Maglev system has the characteristics of strong nonlinearity and instability. In order to realize the air gap control, the current-PID control of the electrical magnetic coil was widely used in the traditional method, with the help of linearizing the local area around the balance point, adjusting the pole points, and observing or filtering the states.The above-mentioned...
Slide mode variable structure control method is used for designing a digital controller of BLDC electric actuator in this paper. Firstly, the mathematic model of electric actuator is built according to the selected BLDC motor. Secondly, two slide mode algorithms, proportion switching algorithm and velocity trending law algorithm, are designed for the electric actuation system. Thirdly, we design a...
In this paper, a new variable structure control method involving fuzzy adaptive regulation of reaching law is presented for seismically-excited building structures. The undue chattering effect, the major disadvantage of conventional variable structure controllers, has been avoided by introducing this new method without losing the robustness against parametric uncertainties and modelling inaccuracies...
A B-spline neural-network-based variable structure controller (VSC) for a class of nonlinear systems with parameter uncertainties is presented. The neural networks compensator is used to compensate the uncertainties in the systems. The tracking performance and stability is guaranteed by the VSC controller. The asymptotical stability of overall systems is verified by the Lyapunov stability criterion...
As sliding mode (SMC) control has just a unitary switching face, the system converges slowly at the origin. An improvement was made to the linear switching surface of SMC for autonomous underwater vehicles (AUVs) in this paper. A polyline switching surface was proposed, velocity control and velocity control at appointed positions were realized. The improved switching surface was made up of the lines...
A novel robust Hinfin decentralized intelligent control (RHDIC) strategy is proposed for the trajectory following problem of robot manipulators. The proposed system is comprised of a computed torque controller and neural robust controller with new learning algorithm. Based on Lyapunov stability theorem, it is shown that the proposed controller can guarantee stability of closed-loop systems and satisfactory...
A fuzzy sliding mode controller for permanent magnet synchronous motor (PMSM) is designed to solve the chatting problem in this paper. The sliding mode controller based the assumption of known uncertainty bounds often cause the chattering phenomena in the control system. So a simple fuzzy controller with sliding mode technique is used to evaluate the uncertainty bounds of PMSM which are caused by...
This paper takes a detailed discussion about a class of nonlinear systems with uncertainty and Lipschitz part. In the particular systems, the nonlinear part satisfies the Lipschitz condition, while the uncertain part is a bounded function. A design of nonlinear sliding mode observer is then developed, with which the system stability is fully proved. Simulation studies are presented to demonstrate...
A novel fuzzy sliding-mode structure has been proposed for Exend Kalman Filter(EKF) based sensorless control of an induction motor in this paper. The design includes a Extend Kalman Filter(EKF) from measured stator terminal voltages and currents. The estimated speed is used as feedback in an indirect vector control system achieving the speed control without using shaft mounted transducers. Fuzzy sliding-mode...
According to the nonlinear closed electro-hydraulic proportional system, a multiple sliding mode adaptive control method is proposed. Recursive technique is used to simplify the control problem of higher-order system. A robust adaptation scheme was used to reduce the tracking error resulted from system uncertainties . Firstly, the recursive technique and state feedback precise linearization scheme...
A reaching law with variable switching sector is presented in this paper, and the VSC of which is designed by the reaching law method is given. It has shown, from the theory analysis and the simulation results, that the stability of sliding mode designed by reaching law with variable switching sector method is better than that of the discrete reaching lawpsilas. So the performance of sliding mode...
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